Question: In addition to the injection of sand sugar orange heads and trunk worms, what are the good methods for prevention? Since the beginning of last year, tree heads and tree trunk locusts have been very harmful. If they are not controlled in time, it will be a devastating blow to orange trees. Tianniu was recently discovered. The front row had a needle and a new beech powder.
Answer: The pests on the neck or roots of citrus fruit trees are mainly larvae of the calf species. For example, adult females of Spermoptera are generally mid-to late May to late June, and they lay eggs below the height of 60 cm in the trunk of citrus fruit trees, or spawn at the root neck, and the eggs are about 5-6 mm long. Milky white is not visible to the naked eye. Hard to find. After hatching, the larvae first feed under the cortex near the spawning place. Soon afterwards, they hunted down. When they reached the horizon, they rushed around the trunk and grazing. The range of feeding was mainly within 15 cm below the ground. Lime white trunks will have a certain effect. The white-painted trunks and root necks can affect female adults of Starlings in the above areas. At the height of spawning, it is also possible to pack the lower part of the trunk with a fertilizer bag to prevent its spawning. In addition, the chemical fertilizer bags are regularly collected, new chemical fertilizer bags are newly tied, and the last used chemical fertilizer bags are immersed in water to eliminate the eggs.
For larvae that have invaded the trunk or root neck, fine iron wire can be used to pierce the larvae along the boring hole, or use an insecticide such as 480 g/litre general king chlorpyrifos emulsifiable concentrate 500 times liquid, and adjust the medicine with thorium to block the boring Or use pinholes to inject insecticides to kill larvae. Then use 25 g/L of top 2-azpolymethoxazole Emulsion EC 2500, or 1.8% abamectin EC 3500x liquid to spray the crown to kill the adult. In addition, at the height of adult oviposition, attention was paid to checking the site where the trunk was about 60 cm above the surface, and the insect eggs were scraped and burned.
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