The names of the crickets were larvae, and the larvae bored the underground part of the leeks and the tender stems. When the damage was light, the plants wilted and broken leaves. The heavy piers died and even the whole pods turned yellow. The occurrence period of helium is short, and the generation of algebra is affected by the temperature. The larvae or cockroaches are used for wintering in the soil surrounding the clams, and they are also harmful to the winter in protected land production. When the leeks sprout in the field, the overwintering larvae begin to move and the adults emerge in the middle and late March. The adults were pleasing to the shade, flying in the morning near the pier and laying eggs in the earth seams; the larvae were wet and had saprophytic characteristics, and the pods were severe when the chickens were not cooked in the field. The ground temperature is stable above 12°C in spring and it begins to harm. In the middle and late April, the ground temperature is 16°C-22°C, which is the peak period of earthworm damage. When the ground temperature exceeds 26°C, the degree of damage is reduced.
Prevention and control measures First of all, before the amaranth sprout germinate the top soil from the leeks, but do not hurt too much leeks root system, the top soil from the top must also be sunburned, the larvae can be killed after 5-6 days; second, in the sun After the soil is backfilled, it is necessary to pour 48% Difenoxime (chlorpyrifos + phoxim) EC 1000-1200 times, or 50% phoxim 1500 times, or 48% chlorphenird Chlorpyrifos 2000 times. Liquid to improve the control effect.
Chemical Raw Materials for Building
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