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Extension Entomology

Tag: adult western rootworms

Corn Update

–Dr. Jeff Whitworth and Dr. Holly Schwarting

The first western corn rootworm adults were collected on 17 June from a corn field in north central Kansas.  Development is being completed very quickly, which should be expected based upon the temperatures we have been experiencing.  However, there are still some larvae feeding on roots.

CRW adult 2016

CRW larva mass in root

None of the plants sampled have started tasseling and therefore adults are feeding on leaves.  This typical leaf feeding by adults will not impact yield.

WCRW adult leaf feeding

Adults will probably start feeding on emerging tassels and then shift to silk feeding when silks start emerging.  Remember, corn plants are very efficient pollinators, so as long as a little silk is showing above the husk, the pollen will be successful.  There are still many adult tarnished plant bugs in the corn fields and these are quite commonly confused with adult western corn rootworms.  However, they will NOT clip silks.

tarnished plant bug adult

 

Some leaf feeding is also evident by corn earworms and fall armyworms.  Again, these leaves can look ragged, thus the name ragworm, but will not impact yield.

CEW1

CEW2

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