![Man Flame Weeding a field](https://webarchive.library.unt.edu/web/20090116030940im_/http://www.attra.org/images/flameweedveg/man_flameweeding.jpg)
Photo courtesy: Flame Weeders, Glenville,
WV |
Abstract
Flame weeding, a thermal weed control, uses propane gas burners to produce a carefully controlled and directed flame that briefly passes over weeds, searing the leaves and causing the weed to wilt and die. Flame weeding, as a non-chemical weed management technique, is frequently used by organic farmers. This publication discusses different strategies for pre-emergent flame weeding and post-emergent flame weeding, as well as infra-red weed control, and steam and hot water weed control. Further references, including sources of information and equipment, are also provided.
Table of Contents
Introduction
Flame weeding — a type of thermal weed control —
was commonly used in row crops like cotton and sorghum from the
late 1930s until the mid-1960s, when selective herbicides became
widely available. In the 1980s and ’90s, flame weeding made
a rapid comeback as a non-chemical weed control technique, especially
among organic farmers.
Flame weeding, also called flame cultivation, relies on propane
gas burners to produce a carefully controlled and directed flame
that briefly passes over the weeds. The intense heat sears the leaf,
causing the cell sap to expand and disrupt cell walls. Foliage that
retains a thumb print when pressure is applied between your thumb
and finger has been adequately flamed. The flamed weeds soon wilt
and die, usually in one to three days.
Weeds are most susceptible to flaming when they are seedlings,
1 or 2 inches tall. Broadleaf weeds are more susceptible to lethal
flaming than grasses. Grasses develop a protective sheath by the
time they are approximately 1 inch tall and may require a second
flaming. Repeated flaming can likewise be used to suppress perennial
weeds such as field bindweed.
Flame weeders come in a range of human- and tractor-powered models.
Market-farming equipment options include handheld single-torch flamers,
as well as push-wheeled multiple-torch flamers mounted under a flame
hood. Tractor-powered kits are available in 2, 4, 6, and 8-row models,
with or without a flame hood; other options include a complete toolbar
setup with accompanying cultivator attachments for between-row mechanical
cultivation. Farmer feedback on flame weeding has been positive.
Joe Fitzgerald, a farmer near Dubuque, Iowa, reported that “a
blind person can see the difference in weed control” between
flamed and unflamed organic corn, even though both plots had also
been rotary-hoed and cultivated. (1)
Back to top
Pre-emergent Flaming
Controlling weeds
before the crop emerges is known as pre-emergent weed control.
In vegetable crops, there are two distinct ways to use pre-emergent
flaming: the stale seedbed technique and the peak emergence
technique.
|
Stale Seedbed Technique
The stale seedbed technique is a form of early-season weed control
in direct-seeded crops. Seedbed preparation and soil stirring —
for example, hilling the soil into beds — always results in
a flush of weeds. With this technique, instead of sowing vegetable
seeds into freshly prepared soil, planting is delayed. The aim is
to knock down the early-germinating weeds, and perhaps a second
flush of weeds, without further soil tillage (which would bring
new weed seeds to the surface).The vegetable crop is then seeded
into a weed-free bed. Most often, shallow tillage or herbicides
are used to knock down the flush of weeds, but flaming is an alternative
technique. Growers will sometimes pre-irrigate to induce more weed
growth before flaming.
![After the weeds started to grow](https://webarchive.library.unt.edu/web/20090116030940im_/http://www.attra.org/images/flameweedveg/after_weeds.jpg)
Flame off the first flush of weeds for a clean seedbed. |
This technique can also be used to prepare a stale seedbed prior
to setting out transplants. Essentially, you are helping your vegetable
crops get off to a good start by eliminating early-season weed competition.
Once the vegetable canopy forms, shade reduces weed germination;
weed seedlings that do sprout can be controlled by mechanical cultivation.
The critical weed-free period is the minimum length of
time a crop must remain nearly weed-free to prevent reductions in
yield or quality. For most vegetables, this is usually the first
quarter or third of their growing period — something like
four to six weeks after seedling emergence, and slightly less for
transplants. Weeds emerging after this period have less impact on
vegetable yields than early-season weeds.
Critical Weed-Free
Periods for Selected Weeds in Vegetable Crops |
Crop |
Location of Study |
Critical Weed-Free Period* |
Major Weeds Present |
Snap beans |
NJ, MA |
Emergence to Full Bloom, 2 to 4 WAE |
cocklebur, purslane |
Cabbage (transplanted)
|
Ontario |
3 to 4 WAP |
lambsquarters, pigweed,
crabgrass, green foxtail |
Muskmelon |
Israel |
4 to 6 WAE
0 to 3 WAE |
pigweed species,
smooth amaranth |
Onions |
OR |
All seasons |
redroot pigweed |
Summer squash |
CT |
4 to 6 WAT |
quackgrass, lambsquarters, ragweed |
Sweetpotato |
Phillipines |
2 to 4 WAT |
grasses, morning-glory |
Tomato (bare ground)
|
Ontario |
28 to 35 DAT |
lambsquarters, ragweed, pigweed, crabgrass,
foxtail, purslane |
Watermelon |
NC |
2 to 4 WAT |
large crabgrass |
*WAE: weeks after
emergence; WAP: weeks after planting; DAT: days after transplanting;
and WAT: weeks after transplanting. |
|
Peak Emergence Technique
In the peak-emergence flaming technique, vegetable seeds are promptly
sown after seedbed preparation. Just before vegetable seedlings
emerge, the bed is flamed to kill seedling weeds (which tend to
sprout faster). The aim is to eliminate the first flush of weeds
and catch the seedling weeds when they are young and susceptible,
while avoiding damage to the vegetable crop. (2,
3)
![Steel in the Field, SAN Publications](https://webarchive.library.unt.edu/web/20090116030940im_/http://www.attra.org/images/flameweedveg/san_pub.jpg)
Steel in the Field, SAN Publications. |
This second method is especially well suited to slow-germinating,
direct-seeded crops like carrots and parsnips. At optimum soil temperatures,
carrots germinate approximately seven to eight days after planting.
In this case, weeds would be flamed off after five or six days.
However, carrots are commonly planted in cool soils and germination
may take as long as 14 to 21 days. Consequently, it’s best
to dig into the row to check on the progress of seedlings and time
the flaming accordingly. Some growers place a pane of glass or plastic
strip over a small section of the bed to speed up carrot seed germination.
The field is flamed when the carrots under the glass emerge. The
rationale is that the carrots in bare soil will typically emerge
a few days later.
In European trials, flaming alone reduced weed populations in carrot
beds by 80 percent. (3) As carrots are particularly
difficult to weed, this technique is a real boost to organic farmers.
Steve Meyer, a market gardener in West Virginia who flames carrots,
onions, and beets, said, “The difference in weed control between
flamed and unflamed beds is like night and day.” (4)
Following flaming, and for the duration of the growing season,
a mechanical weed-control system can be used for carrots, employing
specialized cultivators (finger weeders, inter-row brush hoes, steerage
hoes) or standard cultivators and wheel hoes. Refer to Steel in
the Field: A Farmer’s Guide to Weed Management Tools, a practical
handbook from the Sustainable Agriculture Network, for descriptions
and illustrations of mechanical cultivation tools. (5)
The following table shows the approximate number of days to carrot
seedling emergence at various soil temperatures, when seeds are
planted ½ inch deep.
Days to Emergence for Carrots at Different
Soil Temperatures |
Soil temp. (°F) |
32 |
41 |
50 |
59 |
68 |
77 |
86 |
Days to emergence |
NG* |
51 |
17 |
10 |
7 |
6 |
6 |
*NG=No germination |
Source: Lorenz, Oscar A. and
Donald N. Maynard. 1980.
Knott's Handbook for Vegetable Growers. 2nd ed.
Wiley-Interscience, John Wiley & Sons, New York. p. 56 |
To increase the effectiveness of flame weeding on vegetable beds
for carrots and other direct-seeded crops, Thermal Weed Control
Systems, Inc. of Neillsville, Wisconsin, offers a flame hood similar
to those used in Europe. Ron Jones of Thermal Weed Control Systems
calls it a “hover burner.” The tractor-drawn models
he manufactures have 5 to 7 burners, and cost in the neighborhood
of $2,250. Jones explained that lettuce growers are also using the
hover burner between sequential crop plantings to control insect
and disease problems. Flame Weeders, a small company in West Virginia,
manufactures push-flamers for market farmers that are wheel-mounted
with flaming hoods; these range in price from $300 to $400.
An Australian
report provided the following summary of pre-emergence flaming
(6):
“Pre-emergence technique used by organic farmers was
tested and adapted to Australian conditions. This technique
was used one day before seeding and one day before emergence
on carrots and onions. The first manual weeding (hand hoeing)
was completely eliminated. A labor cost for hand weeding a
plot 1m x 100 m was reduced from $160 to $2.50 LPG [Liquid
Propane Gas] cost.
“Only one flame treatment was used for sweet potatoes
and lettuce one day before the seedlings were transplanted
into the ground. One row of sweet potatoes was 95% weed free
for four months (from transplanting to harvesting). The lettuces
were without weeds for one month between planting seedlings
to harvest.
“We recommend one heat treatment for the crops with
good ability to suppress weeds such as beans, pumpkins, sweet
potatoes, potatoes, cucumbers, melons, sweet corn and transplanting
crops. Two passes are recommended for the crops with poor
ability to suppress weeds such as radishes, carrots, greens,
onions, tomatoes, lettuce, broccoli and cabbage.
“Cleanup of a seed bank is possible with multiple passes
(up to five). In spring and early summer the second treatment
will often have to take place from a week to at most 10 days
after the first. The third treatment follows after 10 to 12
days, the fourth 2 to 3 weeks later and the fifth 4 to 6 weeks
thereafter. The best results are achieved by sticking to the
schedule and when the weeds are between 1 and 2 cm in height.” |
Back to top
Post-emergent Flaming
Flame weeding can be applied after the vegetable crop
has emerged by directing the flame away from the crop plants, by
shielding the crop, or by flaming at a time when crop stems are
resistant to heat. This method is also known as “selective
flaming.” Directing flames into the crop row is a scary thought,
but some plants can withstand the heat, especially after they’ve
put on sufficient vegetative growth. The result is a non-chemical
means of in-row weed control; for organic farmers, this
is a significant tool. For example, see the pictures
on flame weeding for corn at Reducing Herbicide Usage on the
Farm, a joint project of Agricultural Utilization Research
Institute (AURI) and Sustainable Farming Association of Minnesota
(SFA).
Reports from the literature include the following examples:
- Sweet corn can be flamed when it reaches a height of 4 inches,
and thereafter until it reaches canopy.
- Irish potatoes are flamed to control Colorado potato beetle,
achieving 70–80% reduction of overwintering adults and 35%
reduction of hatching eggs.
- Tomato plants can be flamed with very little stress when transplants
are eight weeks old.
- Onions can be flamed for the first time when they are only 2
to 3 inches high.
- Cole crops can be flamed 2–3 weeks after transplanting.
Cross Flaming
Cross flaming is one of several methods that can be used to flame
weeds in emerged crops. Burners are placed at an angle on either
side of the row, in a staggered pattern so that the combined flames
cover the entire drill row area. Setting burners directly opposite
each other should be avoided, since this can create turbulence and
cause flames to boil up and damage crop leaves. During treatment,
flames blow through the base of the crop, selectively killing weeds
within the row without damaging the relatively heat-tolerant crop
stems. Flames do not come in direct contact with crop foliage.
The specific flaming angle, flaming pattern, and flame length vary
with the manufacturer’s recommendations, but range from 30°
to 40°, at 8 to 12 inches above the base of the plants, with
flame lengths of approximately 12 to 15 inches. It is easiest to
adjust the flame at night, when the flame path can be seen most
clearly.
Some experimentation will be necessary to determine the appropriate
ground speed for each crop and situation. Weed density, the age
of the weeds, and weather conditions affect flaming results. Ground
speeds can range from 3 to 5 miles per hour.
Parallel Flaming
>![Parallel Flaming](https://webarchive.library.unt.edu/web/20090116030940im_/http://www.attra.org/images/flameweedveg/parallel_flaming.jpg)
Photo courtesy: Dr. Wayne A. LePori,
Department of Agricultural Engineering,Texas A&M |
Parallel flaming is a technique used to control weeds close to
the rows for crops that are small or cannot tolerate cross-flaming.
In this method, burners are set parallel to the direction of the
crop row. A crop shield is sometimes employed to protect the crop.
Cross-flaming and parallel-flaming rigs are often combined with
mechanical cultivators to control weeds between the rows. Mechanical
implements may include tines, sweeps, or rolling cultivators.
Middle Flaming
A third method of post-emergent flaming is middle flaming. Two
burners are installed under a lightweight hood that covers the row
middles. The hood directs the flames to the weeds in the row middles
while protecting the adjacent crop foliage.
Water-shielded Flaming
Water-shielded flaming is a technique that was developed for use
on cotton farms in the Mississippi Delta. Water nozzles are placed
on the flame rig to direct fans of water onto the crop plant for
extra protection.
Back to top
Infrared Weed Control
Infrared weeders—first developed in Europe—are heated
by a propane torch, but the flame is directed toward a ceramic element
or steel plate that radiates at temperatures of 1800 to 2000 °F.
The danger associated with an open flame is thereby minimized. The
mechanism of weed control is the same as in flame weeding; cell
contents—plasma and proteins—are disrupted and the plant
wilts down and dies. Infrared heaters are available in handheld,
push-wheeled, and tractor-mounted models. In addition to weeding,
the tractor-mounted infrared thermal units are used to control Colorado
potato beetle and potato vine desiccation. Some of the tractor models
feature the injection of forced air to increase the effect.
In North America, a line of Swiss-made infrared weeders are available
through two companies: Forevergreen and Rittenhouse (see Further
Resources below).
These range from handheld to push-wheeled models suited to gardening,
landscaping, nurseries, municipalities, and market farming. The
handheld and push-wheeled infrared weeders appropriate for market
farming are available in the $900 to $1,200 range. While infrared
weeders appear to be a promising new thermal weed control tool,
the equipment expense remains prohibitive for many smaller-scale
market farmers. By comparison, a push-wheeled flame weeder is $300–$400.
Back to top
Steam + Hot Water Weed Control
Steam weed control and hot-water weed control have attracted attention
in trade magazines, especially the fruit and vine grower magazines.
High-temperature water provides a form of thermal weed control,
yet eliminates the danger of flame application in arid regions where
open fires are a hazard.
The January–March 2002 issue of Weed Technology featured
a research article on steam application for cropland weeds. (7)
A custom-built, prototype steam generator-applicator machine with
combined tillage implements was used in field trials. Weed control
was comparable to glyphosate herbicide in some trials, and less
spectacular in others. Factors affecting its use were: age of weeds,
slow application speed, amount of steam applied, and cost of propane
fuel. The authors concluded that improvements to steam equipment
may make conservation tillage an option for organic farmers, by
enabling no-till weed control without herbicides.
Altogether, the limiting factor to hot-water weed control is affordable
small-scale equipment. There are three brands in North America:
Waipuna, Aqua Heat, and Aquacide (See Further
Resources below). However, they range in price from $9,000 to
$35,000 and are primarily geared to municipal and institutional
use for vegetation control around parks, lakes, and athletic fields,
as well as non-cropland weed control around sidewalks, streets,
and parking lots.
Practically speaking, innovative small-scale vegetable farmers
are faced with scrapping together their own steam devices. Another
option, perhaps, is collective ownership of equipment on a district-wide
basis. Nevertheless, the technology exists and therefore it is mentioned
here, along with equipment suppliers and Web resources, for those
growers who wish to investigate it further.
Back to top
References
-
Anon. 1999. Flame weeding for weed
management. The Practical Farmer [Practical Farmers of Iowa].
Winter. p. 17.
-
Desvaux, R. and P. Ott. 1988. Introduction
of thermic weed control in southeastern France. p. 479–482.
In: Patricia Allen and Debra Van Dusen (eds.) Global Perspectives
on Agroecology and Sustainable Agricultural Systems. Proceedings
of the Sixth International Scientific Conference of IFOAM, UC-Santa
Cruz, CA, Aug. 18–20, 1986.
-
Daar, Sheila. 1987. Update: flame
weeding on European farms. The IPM Practitioner. March. p. 1–4.
-
Steve Meyer. March 2000. Personal
communication.
-
Bowman, Greg (ed.) 1997. Steel
in the Field: A Farmer’s Guide to Weed Management Tools.
Sustainable Agriculture Network, Handbook Series No. 2. Sustainable
Agriculture Publications, University of Vermont. 128 p.
-
Janvanociski, Zlatko. 1999. Thermal
infrared weed control. WA Bank Landcare Conference, “Where
Community Counts,” Esperance, Australia.
-
Kolberg, Robert L., and Lori J.
Wiles. 2002. Effect of steam application on cropland weeds. Weed
Technology. Vol. 16, No. 1. p. 43–49.
Back to top
Further Resources
Equipment and Supplies
Flame Engineering, Inc.
P.O. Box 577
LaCrosse, KS 67548
888-388-6724
785-222-3619 FAX
flame@awav.net
—Manufacturer of the famous Red Dragon handheld flamer as
well as alfalfa flamers, row-crop flamers (2 to 8-row kits), and
a grape vine berm flamer that can also be used in orchards. A major
supplier of liquid propane accessories to the flame weeding industry.
See their online book, Agricultural Flaming Guide.
Thermal Weed Control Systems, Inc.
Contact: Ron Jones
N1940 State Hwy 95
Neillsville, WI 54456
715-743-4163
715-743-2921 FAX
jonesconsulting@juno.com
—Manufacturer of row crop flamers (flame kits and complete
units) that combine flamers for in-row weed control and rolling
cultivators for between-row cultivation. Row-crop flaming kits are
available for 4, 6, and 8 rows. A flame hood setup is also available.
LP Weed Burner
Contact: Dennis Lutteke
56360 200th Street
Wells, MN 56097
507-553-5633
—Manufacturer of row crop flamers (flame kits and complete
units) adaptable to cultivators or toolbars.
Peaceful Valley
Farm Supply
P.O. Box 2209
Grass Valley, CA 95945
888-784-1722 (toll-free)
530-272-4769 (local)
530-272-4794 FAX
contact@groworganic.com
—Organic farm equipment and supply dealer, carries: handheld
flamers, backpack frames for propane tanks, row crop flame kit suitable
for mounting on a toolbar and flaming 4 rows.
Flame Weeders
Contact: Steve Meyer
1711 Mud Lick Rd.
Glenville, WV 26351
304-462-7606
info@flameweeders.com
—Farm-based equipment manufacturer specializing in flame weeders
for market farmers. The flamers are mounted on wheels, combined
with a flaming hood; the propane tank is carried on a backpack frame.
Models range in size from four torches at 24 inches in width to
five torches at 30 inches in width, ranging in price from $300 to
$400.
Forevergreen
19974 12 Avenue
Langley, BC
Canada V2Z 1W3
604-534-9326
604-530-7129 FAX
info@chemfree-weedcontrol.com
—North American distributor of the Swiss-made Eco-Weeder,
an infrared thermal weeder heated by a propane flame passing over
a ceramic casing. Models include handheld and push-wheeled weeders
for use around the home and in gardens, parks, market gardens, small
farms, and orchards.
Models: Punto Lady | Junior 3 Agri I / II | Agri Ronco | Agri IV
2 & 3 | Agri IV.
Rittenhouse & Sons
RR#3, 1402 Fourth Ave
St. Catharines, ON
Canada L2R 6P9
800-461-1041 Professional Sales
905-684-8122 (local)
905-684-1382 FAX
prosales@rittenhouse.ca
—See the section Alternatives for Weed & Pest Control.
Rittenhouse sells the Infra-Weeder series in a price range of $210
for the hand held Infra-Weeder Eliminator (8.5 cm x 17cm plate),
to $880 for the handheld Infra-Weeder 100 (6" x 11" plate),
to $1,200 for the push-wheeled Infra-Weeder 300 (8" x 12"
plate).
Waipuna USA
Contact: Jeff Wingren
1050 W. Lilycache
Bowlingbrook, IL 60440
630-514-0364
630-759-8155 FAX
jeffw@waipuna.com
—Waipuna, from New Zealand, specializes in a hot foam system;
the foam is derived from coconut sugar and corn sugar and is approved
for organic production. A single-burner generator covers a width
of 8 to 10 inches in the $22,000 price range. A double-burner generator
covers a width of 24 to 32 inches in the $35,000 price range. Currently
these are geared to municipalities, park departments, airports,
and institutional settings. An agricultural unit is under development,
with an aim toward orchards, vineyards, and similar agricultural
applications.
Aqua Heat Technology, Inc.
Contact: Harry Rajamannan
5155 E. River Road, Suite 405
Minneapolis, MN 55421
763-785-2661
—Aqua Heat is the company in Minnesota that developed hot-water
weed-control equipment for orchards, vineyards, and park departments.
OESCO, Inc.
P.O. Box 540, Route 116
Conway, MA 01341
800-634-5557 (toll-free)
413-369-4335 (local)
413-369-4431 FAX
info@oescoinc.com
—Supplier of the Aquacide hot water weed control equipment
system, in the price range of $9,000, geared to nursery production,
landscapes, and park departments.
Videos
Vegetable Farmers and Their Weed-Control Machines is a 75-minute
educational video on mechanical cultivation and flame weeding equipment
produced in 1996 by Vern Grubinger (University of Vermont) and Mary
Jane Else (University of Massachusetts), with funding from USDA-SARE.
Cost is $12.00 from:
UVM Center for Sustainable Agriculture
University of Vermont
Agricultural Engineering Building
63 Carrigan Drive
Burlington, VT 05405
802-656-5459
802-656-8874 FAX
susagctr@zoo.uvm.edu
Web Resources
Thermal Weed Control: Flame Weeding
Flame
Cultivation in Cotton
Mississippi State University Extension
Service, IS 1500
—Flame weeding has a long history of use in the Mississippi
Delta states. This fact sheet from Mississippi State University
provides a brief introduction and summary on flame cultivation for
cotton.
Flame
Engineering, Inc. OnLine Agricultural Flaming Guide
—The Agricultural Flaming Guide provides a history of flame
cultivation, with a summary of methods and flaming techniques for
corn, soybeans, grain sorghum, cotton, potatoes, tomatoes, cole
crops, alfalfa, and grape vineyards.
Other
Practices to Control Weeds: Flame Weeding
Sustainable Practices
for Vegetable Production in the South
Dr. Mary Peet, NCSU
—Dr. Mary Peet published one of the very first books on sustainable
vegetable production. This section touches on flame weeding, with
a couple of farmer profiles.
Hot Tips For Flame Weeding From:
Steel
in the Field, SAN Publications
—A section on flaming from Steel in the Field, a publication
from SAN (Sustainable Agriculture Network). Steel in the Field is
a practical handbook on non-chemical weed control, with very helpful
diagrams and descriptions of 37 specialized cultivators used in
mechanical weed control; highly recommended for the organic farmer’s
bookshelf.
Flame Weeding
Reducing Herbicide Usage on the Farm project, Agricultural Utilization
Research Institute (AURI) and Sustainable Farming Association of
Minnesota (SFA)
—A report on flame weeding techniques and field trials on
vegetable farms in Minnesota.
Flame
Weeding for Weed Control and Renovation with Strawberries Greenbook
2000 (PDF / 476KB), Energy and Sustainable Agriculture Program,
Minnesota Department of Agriculture
Flame
Weeding for Weed Control and Renovation with Strawberries Greenbook
2001 (PDF / 372KB), Energy and Sustainable Agriculture Program,
Minnesota Department of Agriculture
—These two research reports summarize field trials on flame
weeding for strawberries in Minnesota, with relevant details on
weed control techniques and tips for flame weeding.
A Review
of Non-Chemical Weed Control Techniques
S. Parish, Biological
Agriculture and Horticulture, Vol. 7
—A reprint of a classic article in the journal Biological
Agriculture and Horticulture, from one of the European researchers.
Comparison
of Three Weed Control Methods: Chemical, Flame and Hot Water
University of Queensland (Australia)
—Hot water was as effective as glyphosate herbicide. Flaming
was less effective, but acceptable weed kill was obtained on juvenile
weeds.
Great
Balls of Fire!
Ecological Farmers Association of Ontario
—A brief report on field trials regarding flame weeding in
potato production.
Flame Weeding
in the Garden
By Sheila Daar
—An online reprint of The IPM Practitioner article by Sheila
Daar, located on the Gameco gas equipment company site in Australia.
Controlling
Weeds in Organic Crops Through the Use of Flame Weeders, (PDF
/ 313KB) Ronnie W. Heiniger. Organic Farming Research Foundation.
No. 6. Summer. p. 17–19.
—A research report from the Organic Farming Research Foundation.
The project took place in North Carolina and investigated the use
of flame equipment in organic popcorn, soybeans, and cotton. The
complete 11-page report is available from OFRF and includes tables
with economic cost, gas usage figures based on pressure and tractor
speed, and weed biomass and yield figures for popcorn.
Flame
Weeding Research at Texas A&M
Dr. Wayne A. LePori, Department
of Agricultural Engineering,Texas A&M University
—Dr. Wayne LePori’s flame weeding research program at
Texas A&M, in collaboration with Mississippi State University
and University of Florida, is aimed at developing new burner designs
and equipment modifications for improved flame weeding in cotton,
sugar cane, vegetables, and other crops. This site features quarterly
research reports and slide presentations, available as downloads,
with color photos of equipment, field trials, and research results.
Flame Weeding Research at Nova Scotia Agricultural College Nabil
Rifai
—Dr. Nabil Rifai’s research provides results and photos
of flame weeding and steam weeding.
Thermal Weed Control: Infra-Red, Steam, Hot Water, International
Companies & Technology
Controlling
Weeds Using Propane Generated Flame or Steam Treatments in Crop
and Non-Croplands
Dr. Thaddeus Gourd, Adams County, Colorado
State University Cooperative Extension
—Colorado State University will compare flame and steam weed
control methods and equipment, including the Atarus Stinger.
The Use of Steam as an Alternative Herbicide
Sandra Robinson, Virginia
Tech
—Reviews the use of the Aqua Heat hot-water weed control system,
with a summary of the advantages and disadvantages.
Hot Water
Weed Control in Carrboro, NC (PDF / 807KB)
—The Waipuna hot-water weed control system is being used by
the Town of Carrboro, North Carolina, as part of its Least Toxic
Integrated Pest Management (IPM) policy and pesticide reduction
program that seeks least-toxic alternatives.
Hot Water:
A “Cool” New Weed Control Method
Journal of Pesticide
Reform. Vol. 15, No. 1.
—Reprint of a brief article introducing the hot-water weed
control method, featuring the Waipuna system from New Zealand.
Effect of Steam Application on Cropland Weeds
Kolbert,
Robert L. and Lori J. Wiles. 2002. Weed Technology. Vol. 16, No.
1. pp. 43–49.
—Journal article in Weed Technology, summarizing research
on a custom-built, prototype steam generator-applicator machine
with combined tillage implements for use in row crop weed control
and no-till agriculture.
Hot
Water Technology
EPA Methyl Bromide Alternatives
—A case study on field trials with the Aqua Heat system in
Florida, aiming to control nematodes and soil-borne pathogens. Custom
applicator costs are estimated at $1,000 to $1,500 per acre for
hot water, which is comparable to $1,200 to $1,500 per acre for
methyl bromide.
Nursery
Soil Fumigation
Dick Karsky, National Proceedings: Forest and
Conservation Nursery Associations, 1997 (PDF / 2.94 M)
—A paper on steam for soil fumigation in field-grown nursery
production. This item is included for the notes, photos, and comments
on steam technology and equipment in general.
Eco-Weeder
(Puzzy Boy)
The Nature Conservancy newsletter
—A newsletter about the Swiss-made infrared eco-weeder from
Forevergreen, also known in Europe as the Puzzy Boy.
Bare
Ground Control Alternative: Flamers and Steamers
Model Pesticide
Reduction Plan, Air Force Center for Environmental Excellence
—A report on IPM weed control from the Air Force. It reviews
the use of flamers and steamers for weed control, with cost estimates
and pros and cons.
Thermal Treatment in Agriculture Primagaz Ltd. (Hungary) (Products now manufactured by Euro-Unior.)
Atarus Thermal Weed Control (Australia)
—The Atarus Stinger features a technology known as water-quenched
combustion—a generator that converts combusting fuel and
water into a high-velocity, high-temperature, moist air flow. It
is geared to orchards, vineyards, and row crops. The Atarus Ranger
is a handheld flame torch for use on farms, parks, and other landscapes.
Weed Control HOAF Group InfraRed
Technology (The Netherlands)
The Greenburner (UK)
ISHS Acta Horticulturae
372: Symposium on Engineering as a Tool to Reduce Pesticide Consumption
and Operator Hazards in Horticulture
—Symposium abstracts, including a number of papers on thermal
weed control.
Puzzy Boy Unkrautvernichter
—Web page for a German company selling the Puzzy Boy line
of infra-red weeders. The pictures are a fast way to grasp what
the different models look like.
UV Weed Control
Kaj Jensen and Electro Light ApS
—Weed Control by ultraviolet (UV) light using high-powered
electronic ballasts.
Flame Weeding for Vegetable Crops
By Steve Diver
NCAT Agriculture Specialist
Richard Earles, Editor
Cole Loeffler, HTML Production
CT 165
Slot 211
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