Friday, May 16, 2014

Watch Weather for Fusarium in Flowering Wheat

Contact: Jill Scheidt, agronomy specialist
Headquartered at Barton County Extension Center
Tel: (417) 682-3579

LAMAR, Mo. -- Jill Scheidt, agronomy specialist with University of Missouri Extension, checked fields south and east near 126 Hwy and M Hwy south of Mindenmines on May 14.

“Wheat is in the heading to early flowering stage. I’ve not seen any armyworm feeding yet, but it is important to scout for them,’” said Scheidt.

Monitor flowering wheat for overcast, humid conditions and temperatures ranging from 77- 86 degrees. Those conditions are conducive to the development of Fusarium.

“Fusarium, or head scab, is identified by a pinkish cast on the kernels and can cause shriveled or blank kernels,” said Scheidt.

Only fungicides that suppress Fusarium should be applied during flowering; Proline, Caramba, and Prosaro are labeled to suppress Fusarium. Scheidt cautions against feeding, breathing in, or replanting Fusarium infected seed because it is toxic.

Based on her scouting, Scheidt says corn is in the 5-7 leaf stage. No diseases or black cutworm were seen; once corn reaches the 4-5 leaf stage, it is no longer susceptible to black cutworm feeding.

“White and purple colored lower leaves were seen in corn, likely a response to the previous cold and cloudy conditions and not a nutrient deficiency. Corn should green up with recent rains and sunnier conditions,” said Scheidt.

According to Peter Scharf, state fertility specialist with University of Missouri Extension, the best time to add nitrogen in corn is not during planting or pre-plant.

Corn has the greatest need for nitrogen when it enters rapid elongation in the 7-leaf stage up to the early reproductive stages before the tassel emerges. Corn does not use a high percentage of nitrogen during the first month of development; avoid applying more than 1/3 of the total nitrogen pre-plant.

Scharf recommends adjusting nitrogen rates up in a wet year and adjusting rates down in a dry year.

The weekly field scouting report is sponsored by University of Missouri Extension and Barton County Extension. For more information on this scouting report, or to learn how to receive it a week earlier by telephone, contact the MU Extension Center in Barton County, (417) 682-3579.


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