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Fruit management experience sprayed good walnuts
During the hardening stage of summer walnuts, proper management becomes crucial, especially through foliar sprays. Here are the key practices to follow:
First, insect control is essential during this period. In July and August, walnut fruit is particularly vulnerable to pests such as the walnut husk fly. These pests lay eggs inside the developing fruit, and once the larvae feed on the flesh, the outer green skin begins to shed, leaving a watery residue. A week later, small pinholes appear, followed by dark brown spots, leading to blackened areas on the fruit—commonly known as "black walnuts." To manage this, begin spraying 5% lambda-cyhalothrin at a dilution of 2000 times or 2.5% chlorpyrifos at 3000 times, applying it two to three times. Promptly remove infested fruits and burn them to prevent further spread.
In addition, several leaf-feeding moths, such as the yellow-spotted moth, green thorn moth, and wood-footed moth, become active during this time. In July, focus on controlling these pests while also addressing other issues. At the start of August, apply 50% dichlorvos emulsion diluted 1500 times. By mid to late August, wrap tree trunks with sticky bands and place stone tiles under the trees to trap overwintering pests, helping reduce their population for the next season.
Second, fertilization plays a vital role in promoting fruit development and flower bud formation. During the hard core stage, apply phosphorus and potassium-rich fertilizers by digging a ring-shaped trench around the tree. This helps ensure the seeds are well-developed and supports the formation of flower buds. You can use 2–3 kg of wood ash, 1 kg of superphosphate, 0.5 kg of potassium sulfate, or 1–1.5 kg of specialized fruit tree compound fertilizer. Apply the top dressing before or after rainfall for better absorption.
For foliar feeding, consider the following nutrient solutions: 0.3%–0.5% urea, 0.5%–1% superphosphate, 0.2%–0.3% potassium sulfate, 1% wood ash leachate, 0.1%–0.2% boric acid, and 0.5%–1% ammonium molybdate. Spraying should be done early in the morning before 10 AM or in the late afternoon after 3 PM to avoid heat stress and potential phytotoxicity. Avoid spraying on rainy or windy days to ensure effective coverage and minimize waste.