In plants such as field corn, this usually causes wilting and death. In dry soil conditions, larvae chew on the plant just below the soil surface. Photo Courtesy: The University of Wisconsin-Madison IPCM Pictured Above: Black Cutworm Larvae (Left: 4th Instar, Right: 6th Instar) If a larval instar is picked up and put in your hand, it will often curl into a C shape. Full-grown larvae are about two inches long and have a gray to black color, often “greasy” in appearance. Black cutworm larvae have a distinct appearance that can be used to distinguish them from other crop insect larvae. The black cutworm larvae cause damage to field corn by feeding on portions of the plant. In particular no-till corn fields are extremely susceptible to black cutworm so check these fields first. It is important to continue to check your emerged corn for black cutworm feeding. have encountered black cutworm damage on corn fields in southern Wisconsin. Several of our agronomists at The DeLong Co. events/c5569losvskrv2nu606ltof8odoīlack cutworm, pupae, side_-19.38.The weather this spring has been particularly conducive to one early season corn pest: black cutworm. Google Hangout Demonstration of Techniques: PDF of Basic USGSBIML Photography Set Up:
USGSBIML Photoshopping Technique: Note that we now have added using the burn tool at 50% opacity set to shadows to clean up the halos that bleed into the black background from "hot" color sections of the picture. Want some Useful Links to the Techniques We Use? Well now here you go Citizen: Photography Information: Canon Mark II 5D, Zerene Stacker, Stackshot Sled, 65mm Canon MP-E 1-5X macro lens, Twin Macro Flash in Styrofoam Cooler, F5.0, ISO 100, Shutter Speed 200 Specimens provided by Benzon.Īll photographs are public domain, feel free to download and use as you wish.
The pupae for some reason strike me as particularly Egyptian. Yet another pest that looks rather beautiful when viewed up close. This species moves into northern parts of North America after overwintering in Texas and Mexico and then pulls off a couple of generations in weedy fields and particularly impacting newly planted corn. Description Black cutworm (Agrotis ipsilon), pupae, side -19.38.58 ZS PMax - USGS BIML.jpgĪgrotis ipsilon - Black Cutworm - Another major crop pest.
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