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Scouting Report: Monitor Corn for Nitrogen Loss, Japanese Beetles
Missouri Ag Connection - 06/19/2017

Jill Scheidt, agronomy specialist with University of Missouri Extension, scouted fields north and west of Liberal for the crop scouting update.

Wheat was in the hard dough stage during this scouting report. Scheidt observed Glume Blotch and Fusarium head scab on heads.

"Check vomitoxin levels if wheat is infected with fusarium. Do not save heavily disease-infected seed; it is likely they will have low germination rates and seedling vigor," said Scheidt.

While it is too late for armyworm in wheat, continue to check fescue fields.

"Armyworms will consume leaves and can dramatically thin stands in a short period of time," said Scheidt.

The threshold for armyworms in fescue is 4 per square foot. Scheidt recommends scouting in the morning or evening as armyworms are active during cooler parts of the day.

Corn ranged from the 4-8 leaf stage. Scheidt observed Holcust leaf spot on larger plants.

"These large, water-soaked lesions look similar to herbicide burn, like paraquat," said Scheidt.

Symptoms show up on leaves several days after heavy rainfall events with hail or high winds. Fungicides are not very effective, but the disease is unlikely to cause significant damage to yield.

Scheidt observed temporary Iron deficiency caused by excessive soil moisture.

"Nitrogen deficiency is likely due to excessive rain amounts. Test soil or plant nitrogen levels and monitor plant color to determine if a rescue nitrogen application is needed. Corn will respond to nitrogen, even in applications as late as tassel stage," said Scheidt.

Japanese beetles have been reported in several counties.

"Japanese beetles are a threat to pollinating corn, if they clip the silk, corn will not pollinate well. Scout further than field edges to make sure the beetles are causing damage to the whole field," said Scheidt.

The threshold for Japanese beetle in corn is 3 or more per ear, clipping silks to less than one-half inch.

The weekly field scouting report is sponsored by University of Missouri and Barton County Extension.

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