Evaluate the response of Group IV and early planted Group V soybeans to fungicide seed and hopper-box treatments.

The results of the Hutcheson seed quality-seed treatment trial at Stoneville are given in Table 1. This trial was planted April 14 and inoculated with Pythium and Rhizoctonia solani. There were significant differences in percent seedling survival between the untreated seed and some seed treatments in both the high and low seed quality trial. However, there were no significant differences in yields between treated and untreated seed in either trial.

The results of the Hutcheson seed quality-seed treatment trial at Hester Farms are given in Table 2. This trial was conducted in a producers field and was not inoculated. There were significant differences between the untreated seed and at least one of the seed treatments in percent stand on the first count in the high quality seed and on both counts in the low quality seed. There were also significant yield differences between plots planted with untreated seed and plots treated with one or more of the seed fungicides in both the high and low seed quality trial.

The results of the DPL 3588 seed quality-seed treatment trial on a sandy soil are given in Table 3. This trial was planted April 14 and was inoculated with Pythium. The only response to seed treatment was on the first counting with the low quality seed. There was no significant yield responses due to seed treatment. This field is sandy and well drained and weather conditions were not favorable for Pythium development.

The results of the DPL 3588 seed quality-seed treatment trial on clay soil are given in Table 4. This trial was planted March 25 and inoculated with Pythium and Rhizoctonia solani. There were significant differences in percent stand for the first count on the high quality seed and on both counts for the low quality seed. However, there were no significant yield differences due to seed treatment in the high or low quality trial.

The results of the soybean seed treatment trial one are given in Table 5. This trial was planted March 30 and inoculated with Pythium. Weather conditions were not favorable for disease development and there were no significant differences in stand counts or yields between plots planted with treated or untreated seed.

The results of the soybean Mixam-Apron XLS trial are given in Table 6. This trial was planted April 14 and inoculated with Pythium and Rhizoctonia solani. There were no significant difference in stand counts or yields due to seed treatment in this trial.

The results of the soybean Wilbur-Ellis trial are given in Table 7. There were significant differences in seedling stands between the treated and untreated seed on the second counting date. There were no significant yield differences due to seed treatment.

The results of these trials reemphasize the fact that response to seed treatment is dependent on environmental conditions following planting and that certain cultural practices such as planting in a bed versus flat have an influence on disease development. Future research will identify which factors influence disease development. Producers should regard seed treatments as 'insurance' and should consider seed treatments when a certain set of planting conditions favor disease development.

Determine effects of late season foliar fungicide applications on Group IV and Early Group V soybeans on seed quality, germination, vigor, and yield.

Results of the foliar fungicide trial on Hutcheson soybeans are given in Table 8. There were no visible differences in foliar diseases in the plots. None of the plots receiving fungicide treatment yielded significantly higher over the untreated control.