The Content Of The Article:
Adult caterpillars hibernate in the ground. From May to June, they pupate. Depending on the weather, the moth flight takes place between the end of May and the beginning of July, whereby the second half of June is considered the high point of the flight. The females start laying eggs on the ground two to seven days after hatching. Each female lays an average of 800 eggs.
The tuber feeding begins with the 3rd instar and lasts several weeks. Especially greedy are the caterpillars in their last stage. These caterpillars hibernate in soil depths of 20 to 40 centimeters. In the spring, they pupate.
Old caterpillars infest the tubers mainly in August and September. Young caterpillars first eat the leaves lying on the ground. Their feeding behavior becomes noticeable when they start to eat the stems in the second instar (pitting).
The only way to prevent an infestation with caterpillars is to keep the owl butterfly away from the potatoes with a fine-meshed net.