Question 3 When did the herbicide injury appear? During or immediately after crop emergence Where do you observe damage? Check weeds and crops to determine selectivity. Root development is normal but the plants are stunted and have damaged leaves. What are the symptoms? Plants have white, bleached leaves. Grass species are more sensitive than broadleaves.–Pigment inhibitors Leaf margins are chlorotic, then become necrotic. Leaf chlorosis is generally between the veins. Broadleaves are more sensitive that grasses. –Photosynthesis inhibitors Corn seedlings have chlorotic to white veins (tiger stripping) and the lower leaves may droop. Soybean seedlings have chlorotic veins and may have a stand reduction. –PPO inhibitors Grass leaves tightly roll (onion leafing). Broadleaves exhibit leaf cupping and strapping. The stems of both grasses and broadleaves may twist (epinasty). Broadleaves are more sensitive than grasses.– Growth Regulators Grass plants leaf-out before emergence. Grasses exhibit improper leaf unfurling during emergence that leads to buggy whipping. Broadleaf plants are stunted, have reduced stands, and leaves have a draw-string (caused by shortened leaf midribs) appearance. Grasses are more sensitive than broadleaves.– Seedling Shoot Growth Inhibitors Start over
