Over the past several years, it has become established in Iowa and has moved steadily from west to east, having been discovered in southeastern Iowa in 2004. Historically, the western bean cutworm was only a pest in the western Corn Belt. Life cycle lengths vary between species and environmental conditions, ranging from one month to a year.IPM : Field Crops : Western Bean Cutworm (Loxagrotis albicosta Smith)ĭownload a printable version of this document (Adobe PDF, 268 kb)
Cutworms pupate in the soil and moths emerge from the pupae. Once hatched, caterpillars pass through several moults before reaching full size. Depending on temperature, eggs can take from three days to several weeks to hatch. Moths lay creamy-white eggs on plant material near the soil surface. Younger plants are more susceptible to attack than older plants. Smaller caterpillars often feed on leaf surface tissue, producing damage similar to lucerne flea. Entire paddocks can be decimated or severely thinned, particularly early in the season. Cutworms can be distinguished by a lack of stripes, which differs to the other species.ĭamage is most common when large (>20 mm) caterpillars transfer from summer weeds to autumn weeds, which usually coincides with emergence of winter crops. Cutworm caterpillars and adults are very similar in appearance to armyworms, native budworm, lesser budworm and corn earworm.
Caterpillars and moths tend to be more active at night. Adult cutworm moths have patterned wings, are good fliers and attracted to lights. When picked up, caterpillar cutworms curl up into a C shape. Cutworm caterpillars grow to 40 mm long, are hairless, plump and smooth with a dark head. Several species of cutworms exist and they are similar in appearance. TruFlex canola with Roundup Ready Technology.Bollgard 3 with Roundup Ready Flex Cotton.Gaucho 600 Red Flowable Seed Dressing Insecticide.Roundup Ready PL Herbicide with PLANTSHIELD Technology.Roundup Ready Herbicide with PLANTSHIELD.
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