Shatian grapefruit spiders prevent and cure
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The annual occurrence of red spiders is closely related to the temperature. In Guangdong, the overwintering phenomenon is not obvious. The suitable temperature for development and reproduction is 20-30°C, and 18-22 generations can occur when the annual average temperature is above 18°C. The egg and part of the pupa were overwintered on both sides of the main vein on the back of the leaf and branches. In the spring and autumn of the year, serious damage occurs, generally from the beginning of March; after the spring shoots are spread, the red spiders on the old leaves migrate to the spring season and the breeding damage occurs; in April-May, the population of the insects rose sharply. During the period from June to July, if the average temperature exceeds 25°C in the last ten days, the population rapidly decreases. The high temperature in summer is not conducive to the growth and development of red spiders, and the population population is at a low peak; the temperature gradually drops from September to October, and the insect population rises again. Autumn shoots; if the long-term drought in autumn, the insect population density will still rise, but less than in spring; winter spider mite usually produces diapause eggs and accumulates the source of insects. In case of warm and little rain in winter, there will be less deaths in overwintering pupa, and large overwintering base. The red spiders often occur early in the Hunchun period and their predators are predators, grasshoppers, ladybugs, flower buds, and parasites.
Prevention methods are as follows:
(1) Use natural enemies to cure embarrassment. Planting musk oysters in the orchard or switching to New Zealand Mung Bean will create a breeding environment for natural enemies.
(2) According to pest observation, timely medication. In the spring, the prevention and treatment of spider mites migrated to the new shoots. The application of pesticides began when the average leaf size was 100-200 heads, which was very important for the control of the occurrence of pests in the year.
(3) Chemical control. The following agents with good effect, long residual effect, low toxicity to natural enemies and humans and animals can be used: 1% avermectin EC 2000 times; 50% TOR wettable powder 1500-2000 times (applicable to temperatures above 20°C) Application 1 week before the peak); 73% Ketel EC 2000-4000 times solution; 5% Nissorange EC 1000-2000 times solution (with high density of nymphs, can add 800-1000 times 40% iridium Diluent with the spray); 25% times the Le Pa WP 1000-2000 times; 20% Daphne WP 1000-2000 times.
(4) Protect natural enemies. Orchards use less broad-spectrum highly toxic pesticides and try to use selective agents to protect natural enemies that have significant control over red spiders, such as ladybugs and predators.