Project Number: 3611-22000-019-10
Project Type: Specific Cooperative Agreement

Start Date: Aug 01, 2006
End Date: May 30, 2007

Objective:
The objective of this cooperative research project is to develop management recommendations for the use of fungicides in post-flowering soybean and to establish fungicide efficacy trials to evaluate both efficacy and phytotoxicity of fungicides on local cultivars to deter potential genotype by fungicide interactions.

Approach:
There are several components that will be evaluated in different experimental programs. The interaction of nozzle type and aperture with pressure, ground speed, or application volume on canopy coverage will be evaluated, as well as the effect of different adjuvants. Kromecote cards and tank-mixed dye will be used in each experiment to determine droplet size and coverage at 75 and 50% of the canopy height. Three cards will be placed across the boom width in three locations at two heights within each plot. Quadris, which is registered for use on soybean and labeled for control of soybean rust, will be used in each experiment unless noted. Obtain information on fungicides in the Section 18 Emergency Exemption Request. Each site will develop an experiment where currently registered Exemption Request are applied to a set of commercial cultivars. The set of cultivars will be selected from the most commonly grown cultivars in each region. The experimental design will be replicated split-plot with three to eight fungicides as the main plots and six to ten cultivars of the sub plots. Plot sizes will be small, 7 to 10 meters in length and four rows wide, with row spacing at 96 cm. Row spacing can be narrower, depending on local production practices. Fungicide applications will be timed for growth stage R2-R3, with a second application 20 days later.