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Extension Entomology

Tag: corn fields

Corn Update

–by Dr. Jeff Whitworth and Dr. Holly Schwarting

Lady beetles are unusually common in corn fields right now.  Most corn plants in north central Kanas are from V2-V6.  Checking corn rootworm plots revealed western corn rootworm larvae of various sizes and thus they are starting to feed enough to cause a little root damage.

CRW larvae

CRW larvae_sizes

CRW larva on root

CRW root damage

Seems like, despite the recent cooler, wetter conditions, the rootworm development is about where it usually is at this time.  Most western corn rootworms have completed the larval stage by the 1st of July, thus root damage will be completed later this month as the larvae begin to pupate in south central and north central Kansas.

 

Ticks

–Dr. Jeff Whitworth and Dr. Holly Schwarting

Ticks are very active throughout the state, and have been for the past month.  The most commonly reported species has been the American dog tick, Dermacentor variabilis.

male am tick engorged am tick female am tick

The cool, humid weather over the past month has provided great conditions for tick development. These annoying, and potentially dangerous parasites have even been encountered in corn fields, which is unusual as they typically develop in more undisturbed areas of grasses, weeds, and other overgrown vegetation.  But, they are very good at finding hosts and getting the blood meal they require for development and reproduction.  For more information on ticks in Kansas, please visit: https://www.vet.k-state.edu/vhc/docs/ticks-in-kansas.pdf

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