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Download green cutworm12/26/2023 ![]() ![]() The adult moths of these species lay eggs on the soil surface in weedy summerfallow fields during late summer. Two subterranean species of cutworms, the redbacked, Euxoa ochrogaster (Guen.), the pale western, Agrotis orthogonia (Morr.), and the early cutworm, Euxoa tristicula, attack flax. They can quickly cause large numbers of bolls to drop by chewing through the more succulent portions of the stem below the bolls. ![]() However, more damage is done to the crop before harvest by the older, larger grasshoppers. Young grasshoppers may attack young plants and cause damage. Pests of Flax and Other Crops Grasshoppers Economic infestations of this pest have been limited so far to west central Saskatchewan. ![]() The older green and white striped worms leave the boll and complete development by feeding on other bolls from the outside. The moths deposit their eggs in the open flowers, and the young larvae eat the developing seed within the boll. Pests of Flax Only Flax bollwormįlax bollworm, Heliothis ononis (Denis & Schiffermiller), is a climbing cutworm. The following species are potentially damaging but often occur in too low a number to cause economic loss. To keep damage low, fields should be examined regularly, and controls applied when infestations reach the economic threshold. Flax may be infested from the time of emergence to maturity by various insect pests. ![]()
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