Thursday, June 13, 2013

English Grain Aphids, Septoria, Fusarium and Armyworms all Found During Field Scouting this Week

Contact: Jill Scheidt, agronomy specialist
Tel: (417) 682-3579

Field Scouting Report for June 12…

LAMAR, Mo. –Jill Scheidt, agronomy specialist with University of Missouri Extension in Barton County, scouted area fields on June 12 to prepare this week’s field scouting report.

English Grain aphids have been seen in wheat heads. Threshold levels for English Grain aphids in wheat heads are 75-100 aphids/head. Treatment may be justified if yellowing plants are seen.

“Septoria head blotch and fusarium, or head scab, were also seen on kernels due to wet weather conditions. It is too late to spray for diseases in wheat,” said Scheidt.

Septoria can be identified by a black discoloration on the outside of the kernel. Head scab is identified by a pinkish orange fungus on the base of the spikelet, the spikelets are usually bleached.

“Armyworms may be moving out of the area. Dead, dried armyworms were seen on wheat heads as a result of a fungus brought in by the rain that killed them. Most armyworms are fully grown larvae that will turn into moths soon, those moths will move north to other non-armyworm-infested fields due to a pheromone armyworms let off,” said Scheidt.

Aphids have been reported in corn. Usually they do not justify treatment, threshold levels for English Grain and Corn Leaf aphid in corn are 400 aphids/plant.

Curled, stunted corn was also seen this week. Damage is likely due to herbicide damage.

“Herbicide damage in corn can occur in herbicides labeled for use in corn under prolonged cool, wet conditions. If herbicides labeled for use in corn are applied at planting, damage may also be seen under cool, wet conditions if the slots were not closed completely at planting,” said Scheidt.


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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