Attention to control walnut ginkgo big silk moth

The larvae of the Ginkgo biloba moth are highly destructive to walnut trees, causing significant damage by feeding on leaves. These larvae are large in size and covered with dense, light-colored, and irritating hairs, which is why they are commonly referred to as "Walnut white caterpillars." The species primarily affects walnuts, willows, and lacquer trees, but can also be found on eucommia, chestnut, and ginkgo trees. When an infestation occurs on a walnut tree, the larvae can completely defoliate the entire tree within a short period. This not only weakens the tree but also leads to severe fruit drop and reduced yield. In extreme cases, the leaves are entirely consumed, leaving only the veins and young fruits, which can cause the death of older trees. As a result, this pest is one of the most damaging to walnut tree health and productivity. The life cycle of the Ginkgo biloba moth involves a single generation per year. Eggs overwinter in cracks and crevices of the walnut tree bark. These egg masses are typically found on stems and branches between 1 to 3 meters from the ground. They are laid in clusters, often containing dozens or even hundreds of eggs. In the following spring, around late April to early May, the eggs hatch after the walnut leaves have fully emerged. The newly hatched larvae then move from the trunk to the lower part of the canopy, where they begin feeding on the leaves. As the larvae grow, they gradually spread out and feed on upper and surrounding leaves. By late May to early June, the larvae enter their fifth instar stage, during which they consume up to 6–10 leaves per day. Once all the leaves are gone, the larvae migrate to other food sources. Some larvae may pupate in the shrubs beneath the trees, while others remain on the tree, feeding on any remaining foliage. Adult moths emerge from October to November, laying eggs in bark cracks and among fallen leaves. This completes the annual cycle of the pest. In our county, outbreaks of this pest were recorded between 1991 and 1993, leading to significant tree mortality in some areas and a serious impact on walnut production. In recent years, the population has increased, and the pest’s range has expanded. With the growing importance of the walnut industry in our region, it is crucial to implement effective control measures. The most economical and effective method for controlling the Ginkgo biloba moth is to remove the egg masses and target the early-stage larvae. Currently, the young larvae are at a critical stage for intervention. Here are some specific control methods: 1. **Scraping Egg Masses**: Manually removing the egg masses from the tree trunks is a simple and cost-effective method. During winter and early spring, when pruning fruit trees, you can scrape off old bark and remove the attached eggs. Applying a white coating agent afterward can help prevent future infestations. 2. **Handpicking**: From June to July, when the larvae are pupating, you can manually collect them from the shrubs around the trees and destroy them. 3. **Larvae Control**: In late May to early June, when the newly hatched larvae are still clustered, spraying chemical insecticides is the most effective method. Commonly used pesticides include 90% trichlorfon diluted 1000 times, 50% phoxim diluted 1000 times, 10% Uranus diluted 6000 times, and 20% speed kill diluted 3000 times. By implementing these strategies, we can effectively manage this pest and protect the walnut industry from further losses.

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