Prevention and treatment of locust

Occurrence Pattern: Euonymus japonicus is commonly affected by the feeding of larvae, which causes significant damage to its leaves. In Hunan Province, this pest has three generations per year. The overwintering adults emerge in mid-April and start laying eggs. By late April, the infestation begins. As the season progresses, the larvae gradually burrow into the soil in mid-May and re-emerge in mid-June. A second generation appears in late June, and the second generation of larvae causes further damage. In early August, these larvae burrow back into the ground, emerging again in mid-August and dying off by late August. The third generation is generally less severe compared to the first two. The most serious damage occurs during a warm and rainy season. During periods of heavy rainfall, entire plants can be defoliated within 2-3 days, leaving them completely bare. However, in seasons with sufficient moisture, the plants may still regrow leaves. If the plants are exposed to high temperatures and drought, they may die entirely. Therefore, timely prevention and control measures are essential to minimize the impact of this pest.

Prevention and Control Methods: A. In winter, plowing the soil helps to destroy overwintering pests. B. Since the overwintering adults are weak fliers, it is important to eliminate them as soon as they emerge. C. In the early stages of larval development, prompt spraying is crucial. Effective insecticides include 90% trichlorfon crystals diluted at 1000 times, 20% speed killing D at 5000 times, and Bacillus thuringiensis at a concentration of 0.2 to 0.5 billion spores per milliliter. Regular monitoring and early intervention are key to preventing large-scale infestations and protecting the health of Euonymus japonicus plants.

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