Elements of IPM for
Snap Beans in NY State

Insects

Diseases

Weeds

european corn borer

root rots

broadleaves

mexican bean beetle

Sclerotinia white mold

annual grasses

potato leafhopper

Botrytis gray mold

perennial weeds

seedcorn maggot

brown spot

spider mites

common blight

tarnished plant bug

halo blight

cucumber mosaic virus

yellow mosaic virus

A. SITE PREPARATION AND SELECTION

Acreage Goal

Points

1) Review weed map/list of fields to choose appropriate weed control strategies. See the Weed Assessment List available for use in satisfying this element.

50%

10

2) Crop rotation. If a field has had halo blight use a 3 year rotation; for brown spot at least a 1 year rotation is required

75%

10

3) In fields with high white mold risk plant rows on wide spacings, in an east/west orientation, avoid shaded areas, and avoid small fields surrounded by trees; If there is a field history of white mold, snap beans should not be preceded by tomatoes, beans, potatoes, lettuce or crucifers.

25% of fields with high WM risk

5

4) Soil test at least once every 3 years. Maintain records. Fertilize according to test results.

100%

5

5) Do not use a systemic insecticide at planting. Use of any systemic insecticide at planting will disqualify the field from consideration as an IPM field EXCEPT if high (more than 2 nymphs per leaf) populations of potato leafhopper have been found in a field in the area before planting. Test leaving out planter box insecticide for seed corn maggot treatment for fields where cover crops have not been used and organic matter is not high.

100%

5

B. PLANTING

1) Select seed treated with insecticide/fungicide for protection from insects and diseases.

50%

10

2) Use seed certified free of halo blight, common blight, and brown spot.

50%

10

3) Use tolerant and resistant varieties for bean common mosaic virus.

50%

10

4) Use varieties resistant to bean yellow mosaic and clover yellow vein viruses if they are available

50%

10

5) For brown spot avoid planting snap beans near dry bean fields.

50%

5

C. PEST MONITORING and FORECASTING

1) Monitor for insects, diseases, and weeds (potato leafhopper, Mexican bean beetle, spider mites, white and gray mold, brown spot, common blight, and halo blight).

50%

10

2) Use the white mold forecasing system in fields which have a history of white mold and conditions are wet enough for disease.

5%

10

3) Update weed map of the field when crop is small for use in evaluating the current year's weed control and for use in determining if a post emergent treatment is needed. See the Weed Assessment List available for use in satisfying this element.

50%

10

D. PEST MANAGEMENT

1) Do NOT apply copper compounds to control brown spot, halo blight, or common blight since they do not result in effective and economic control.(see crop rotation Section A and post harvest Section E.)

75%

5

2) Use thresholds for mexican bean beetle and potato leafhopper. Use a systemic insecticide at planting only under conditions of A5. (see A5)

20%

5

3) Keep records of pest densities, cultural procedures, and pesticide applications for use in the future.

100%

10

4) Choose labelled pesticides that have the least environmental impact. Choose pesticides which preserve natural enemies. (EIQ can be used for decision making)

35%

10

5) If fungicides are used for white mold control and the white mold forecast system is not used, make a maximum of 2 fungicide applications during bloom, the first when 70-80 percent of the plants have one open blossom and the second 5 to 6 days later. The white mold forecast system can assist in determining whether one or both of these sprays are necessary.

75%

10

6) Test the use of a scouting technique used by CCE to determine whether to make inseciticde applications for European corn borer.

5%

5

E. POST HARVEST

1) Make (or update if one has been made for this field previously) a weed map of the field for use in planning for next year. See the Weed Assessment List available for use in satisfying this element.

50%

10

2) For fields which had significant levels of brown spot, halo blight, and common blight incorporate crop residue into the soil at the end of the season to promote breakdown of pathogens and tissues that may be carrying them.

50% of fields with these diseases

10

3) Establish cover crop for weed control and nitrogen retention

25%

5