Farm Talk

Crops

June 24, 2014

Consider wind when applying herbicides

Parsons, Kansas — Jill Scheidt, agronomy specialist with University of Missouri Extension in Barton County, scouted fields west of Lockwood on June 18 for the crop scouting program.

Corn is in the 14-16 leaf stage. “The corn should tassel within the next two weeks. A minor amount of rust was seen on some varieties, but nothing to worry about; rust rarely requires treatment in Missouri corn,” Scheidt said.

Scheidt identified Para-quat herbicide injury on corn in at least one field.  Paraquat is a highly volatile herbicide used in soybeans that can drift more than one mile from the location where it was applied. “If there is wind, wait to apply Paraquat to prevent injury to non-target plants, even if using a drift retardant,”  Scheidt said.

Soybeans are in the 4-5 trifoliate stage. A little herbicide burn from Prefix was seen, the new leaves are unaffected so the plants will recover. She also found some insect feeding. “Soybeans can tolerate up to 30 percent defoliation before bloom before treatment is required,” Scheidt said.

Wheat is in the hard dough stage. Harvest wheat at 13.5 percent moisture in order to prevent fungus development in the storage bin.

“If harvesting wet wheat, producers should dry wheat as it is going into the bin and make sure the first load is completely dry before adding more wheat.  If the grain bin is filled all at once, the wheat at the top of the bin will not dry and may sprout due to humid conditions that occur in June and July,” Scheidt said.

Scheidt found Stagono-spora blotch on some wheat heads. Wet weather conditions after flowering favor disease development in wheat. “No fungicides are available for application at this time. Fungicides must be applied at the flag leaf stage if weather conditions are warm and humid to prevent stagonospora blotch,”  Scheidt said.

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Crops
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