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ECIN
Senior Advisor

Western Bean Cut Worm

Got this off the World Famous -Chat " N " Chew - Thought is was a good heads up for the ones that may not be planting Non GMO Corn - btw I have one of these traps out - It appears that they like the sandy type soils as like in Northern IN - Some in Sothern IN - but near the hot dirt - These are not only in IN . Happy Scouting ! Ken Western Bean Cutworm Moth Flight Begins – (John Obermeyer) - •Moths have begun emerging from soil, mating and egg laying follows •Scouting for egg masses should commence once moth captures are increasing daily •Most Bt corn is protected Pheromone trapping began for western bean cutworm moths on Thursday June 23, and several have been captured since then, refer to “Western Bean Cutworm Adult Pheromone Trap Report.” This is just the beginning of an extended moth emergence and flight, with their peak presence expected 2-3 weeks from now. Those in high-risk areas, i.e., sandy soils, high moth flight and WBC history, should be gearing up for field scouting of non-traited corn. Western bean cutworm egg mass next to larval feeding damage Western bean cutworm egg mass next to larval feeding damage Scouting should begin once moths are being captured nightly. In five different areas of a field, inspect 20 consecutive plants for egg masses which are laid on the upper surface of the top leaves of corn and/or larvae that may have hatched and crawled to the whorl and begun to feed. Usually the newest, vertical leaf is the best place to look for egg masses. Young larvae need pollen to survive, and female moths are most attracted to cornfields that are just about to pollinate. Moths will lay eggs on whorl stage corn when pre-tassel/pollinating corn is not available. Larvae may initially be found in leaf axils, feeding on pollen that has accumulated there. Later damage from larvae, as they feed deep in the whorl (attacking the tassel to get at pollen), will resemble corn borer or fall armyworm damage. Initially the damage will be subtle and not economically important (or even noticeable). Later stage larvae enter the ear and feed on corn kernels and can cause economic damage, and also can exacerbate ear rots, including Gibberella ear rot. In fields where Bt corn is planted, scouting and supplemental control should not be necessary. The proteins expressed in most currently available Bt corn hybrids (including Herculex, Smartstax, and Viptera hybrid lines) have been shown to be highly effective in controlling this cutworm species, although very light surface scraping will be seen on a few kernels at harvest time
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