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Agronomy Talk


Scouting Corn and Soybean Fields

Published on Wednesday, June 22, 2016

Scouting corn and soybean fields weekly in June will enable you to identify any yield-limiting concerns in time to address them.

Late emerging weeds like waterhemp and Palmer amaranth might still be safely controlled if identified before product label restriction deadlines. Scouting provides an evaluation of your overall weed control program and any changes needed for the next year. Escaped weeds in programs labeled for control should be evaluated for herbicide resistance to assure effective modes of action are used in the future.

Corn and soybeans draw heavily on soil nutrients right now and this is when deficiency symptoms often begin to show up. Sidedress nitrogen and foliar micronutrients can still be viable options to provide late season nutrition to both when deficiencies are identified.

While the timing may be a few weeks off for fungicide applications, earlier disease infections such as anthracnose or goss’s wilt could be present in corn. For soybeans, scout for seedling blights, Phytophthora, rhyzoctonia root rots, and brown spot.

It’s also a great time to inspect plants both above and below ground for insect pressure and damage. In corn, dig roots to inspect for rootworm feeding and larvae, and to evaluate control measures. Be sure to look for brown stink bug injury as well as first generation corn borer on non-traited
hybrids. In soybeans, bean leaf beetles and early presence of soybean aphids should be on your watch list.


Author: Craig Kilby