Managing foliar soybean diseases and fungicide applications
Keeping in mind that it takes about 10 weeks to progress from R1 to R6, and assuming a fungicide residual of 3 weeks, an application at R3 (pod development) would last until R5 (beginning pod fill). If a second fungicide was applied at R5, the material would last for most of the period until R6 (end pod fill). In this situation, plants would be protect-ed for approximately 6 of the 7.5 weeks of seed formation.
In addition to application timing, coverage and spray volume also are key components. Proper nozzle selection to obtain smaller droplet sizes will enhance coverage and, in turn, efficacy. Most fungicide labels recommend a minimum of 10 gallons/A spray volume by ground and 5 gallons/A by air. Finally, avoid unnecessary or excessive applications of fungicides, and always follow label directions for the best results.
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