No. 6/May 1, 1998
Black Cutworm Update and Actual Heat-Unit Totals
Black cutworm moth captures continue to be reported by several cooperators throughout the state. Keith Fuller, Fuller Fertilizer, indicated that an intense flight occurred in the area of Adams and Hancock counties during April 26 and 27. Jeff Staley, Gallatin County, found black cutworm moths in each of his three traps on April 27 although none of the captures were intense. Jim Morrison, crop systems educator, Freeport, and Dave Feltes, IPM educator, Quad Cities, both continue to find black cutworm moths in their pheromone traps in northern Illinois; however, to date, most of the captures have been low to moderate in nature.
A quick examination of Table 1indicates that with the exception of counties in southeastern and southwestern Illinois, most areas of the state have not accumulated 300 heat units beyond intense flight dates that may have occurred as early as mid- to late March. Recall that when 300 heat units have accumulated beyond an intense flight, cutting of plants may begin to occur. Obviously, in many areas of the state, corn has yet to be planted. Inupcoming issues of this Bulletin, we will continue to provide you updates on actual heat-unit totals and projected cutting dates. Please refer to last week's Bulletin for projected cutting dates. The projections provided by Bob Scott with the Illinois State Water Survey have not changed significantly during the past week.
Thanks for your reports on black cutworm captures. We appreciate your cooperation!
Table 1. Actual heat unit accumulations (base 50 degrees F) from intense flight dates through April 27
|Date of intense capture of black cutworm adults|
in pheromone-baited traps
Mike Gray (email@example.com), Extension Entomology, (217)333-6652