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What are the control methods for the Euonymus looper (large-leaf Euonymus inchworm)?

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Occurrence pattern: The large-leaf Euonymus looper damages plants by the larvae feeding on leaves. It has three generations in Hunan. The overwintering generation adults emerge and lay eggs in mid-April, damage begins in late April, they successively enter the soil to pupate in late May, emerge in mid-June, the second generation causes damage in late June, enters the soil to pupate in early August, emerges in mid-August, and the third generation causes damage in late August. The most severe damage is caused by the first and second generations. Damage is most severe in seasons with mild climate and abundant rainfall. During the peak damage period, 2 to 3 days can strip all the leaves from the whole plant, leaving the plant bare. In

Occurrence pattern: The large-leaf Euonymus looper damages plants by the larvae feeding on leaves. It has three generations in Hunan. The overwintering generation adults emerge and lay eggs in mid-April, damage begins in late April, they successively enter the soil to pupate in late May, emerge in mid-June, the second generation causes damage in late June, enters the soil to pupate in early August, emerges in mid-August, and the third generation causes damage in late August. The most severe damage is caused by the first and second generations. Damage is most severe in seasons with mild climate and abundant rainfall. During the peak damage period, 2 to 3 days can strip all the leaves from the whole plant, leaving the plant bare. In seasons with sufficient rainfall, the plant can still grow leaves; if high temperature and drought occur after damage, the whole plant dies, so timely control is necessary.

Control methods:

A. Turn the soil in winter to kill overwintering pupae.

B. Overwintering adults have weak flying ability; capture and kill them promptly during the emergence period.

C. Spray pesticide promptly in the early stage of larval damage.

Control agents include: 90% trichlorfon crystal 1000x solution, 20% fenvalerate 5000x solution, Bacillus thuringiensis 0.2 to 0.5 billion spores/ml.

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