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Mid-Wood Inc. Agronomy News

Corn Rootworm, Needle Nematode, and Growth Issues in Corn

CORN ROOTWORMS – WHAT TO WATCH FOR

Purdue University entomologists recently reported on documentation of corn rootworm hatch near Lafayette, Indiana, June 1.  Rootworm hatch likely started a few days earlier in southern areas and is probably underway right now in more northern areas.

NEEDLE NEMATODE THREAT REMAINS – DAMAGE FADING

Needle nematodes are favored under cool, moist conditions in coarse textured soils.  The needle nematode is a highly mobile ectoparasitic species.  It does not tolerate hot, dry conditions well, and will migrate deeper in the soil as these conditions develop.  For this reason, we believe that needle nematode activity in corn should now begin to fade.  However, damage symptoms may persist for some time.

WATCH FOR GROWTH-RELATED ISSUES IN CORN

In many areas, the onset of hot weather has accelerated corn growth.  Rapid corn growth can result in two significant issues.  The first issue, “buggy whip” or “onion leaf” growth, is rarely yield limiting but often catches the attention of growers and other passing by affected fields.  The second issue, “brittle snap” or “green snap,” usually causes spotty damage in fields but has been known to occasionally cause severe damage.

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