Occurrence and Control of Two-spotted Leafhoppers in Fruit Trees

Occurrence and Control of Two-spotted Leafhoppers in Fruit Trees

The leafhoppers that damage the deciduous fruit trees mainly include red spider mites, red spider mites, two-spotted spider mites (white spiders), and red spider mites, of which the two-spotted spider mites are the most resistant and difficult to control. The two-spotted spider mites, also known as white spiders, belong to the Arachnidae, Acarina, and Leafhopper families. The leafhoppers are mainly concentrated in the back of the leaves. Adults, larvae, and nymphs suck the juice from the leaves, resulting in chlorosis, scorch, and even shedding.
First, the morphological characteristics
1. Adult females have a body length of 0.15 mm and an elliptical shape. They are yellow-green during damage and have a large dark green spot on both sides of the body. The overwintering type is orange-yellow. Male adults have a body length of 0.3 mm, flat backs, slightly rhombuses, pale yellowish green, and a pointed and upturned body.
2. Ovoid, initially white, gradient orange.
3. The larvae are hemispherical, yellow-greenish, nymphs are oval, yellowish green or dark green.
Second, the occurrence of regular years 7 to 9 generations, with females in the earth seam, under the litter, trunk stalk skin and the convolvulaceae roots weeds in the rhizosphere at the roots of wintering. When the average temperature in spring reaches around 10°C, it will feed on the broad-leaved weeds and roots of fruit trees under the trees, and then it will be damaged by trees. In the early days, they were concentrated on the long branch of the criminals and gradually spread to the periphery. From mid-June to mid-July, the duration of locust infestation began. With rain, the density of larvae rapidly declined. The temperature dropped in September and gradually shifted to weeds. Wintering. For male and female reproduction, hatching eggs are male and each female can produce 50 to 110 eggs. It takes 20 to 30 days for adults to lay eggs until the first generation of larvae hatch. During the later generations, the population will overlap, and breeding will be accelerated as the temperature rises. It takes 13 days to complete at 23°C, completes at 8°C for 8 to 9 days at 26°C, and completes at 30°C. Generation 6 to 7 days. Adult worms clustered on the back of the main vein of the cluster, and the toxin nets were damaged under the net. There was a tendency of silk drooping to spread by the wind. High temperature and low humidity facilitate the occurrence.
Third, control methods
1. Clear Garden in Winter: In the winter, weeds are cleared of litter, concentrated burned, and eliminate wintering leafhoppers.
The old skin was scraped from the beginning of 2.3 months, and the main scrapings of the stems and branches were scraped. After spraying, 5 degree lime sulfur or liquid was sprayed.
3. Clear the roots from the trees in the spring to eradicate weeds, especially broad-leaved weeds, and burn them together.
4. During the growing season, chemical control agents and acaricides are roughly divided into the following types according to their killing effects:
(1) The total killing of adults, eggs, and nymphs has anthrone, bafalin, azadirachtin, diterpenoid, bellepox, liuyangmycin, dicofol (Apple Red Jade, Xuguang cautious), Decoction ;
(2) Effective for eggs and young nymphs, Nissoran, Apollo, and Kadek who do not kill adult worms;
(3) It is effective for adults and young nymphs and does not kill eggs.
5. Biological control: The natural enemies of leafhoppers include ladybugs, flies, thrips, grasshoppers, grasshoppers, predators, etc., which are important for inhibiting leafhoppers. However, natural enemies have poor drug resistance, and general all-killing agents (such as organophosphorus and pyrethroids) are easily killed. Comprehensive prevention and control methods should be adopted to prevent and treat as early as possible to avoid natural enemies. Suppresses the effects of pests and maintains natural ecological balance.

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