Marvin1982 - 6/27/2025 07:49

Im doing a biological trial in my corn. Going to spray it on corn as soon as it gets dry enough to spray. Corn will be v8 to v10. Will see if it holds off tar spot. We sprayed it on at vt last year and tar spot moved in early September. There wasn't as much tar spot in that half of the field compared to the side with fungicide where it was on every plant. Fungicide only lasts for about 3 weeks. Early assessment shows the biological has longer residual. Will hopefully know more by end of the season. If you spray fungicide now and tar spot moves in after that 3 weeks, you will have to spray again