Peanut leafhoppers commonly occur in Zhaoyuan City, and are mainly cinnabar leafhoppers and two-leafhoppers. The most common occurrence is the cinnabar leafhopper. The occurrence of two-leafhoppers is less, but in recent years Zhaoyuan has been There is a rising trend in the city's two leafhoppers. In recent years, the damage of peanut leafhoppers has gradually increased, which has seriously affected the normal growth of peanuts and has become one of the important insect pests in peanut production. 1. Morphological characteristics. The dorsal view of the female cinnabar leafhopper is oval, 0.42 to 0.56 mm in length and 0.26 to 0.36 mm in width. Its body color is red or reddish, commonly known as “star spiderâ€. There are dark spots on both sides of the body. Its lateral three fissures, medial to the middle of the body. The dorsal view of the male dragon is diamond-shaped, less than females. Two-spotted spider mites are very similar to those of cinnabar leafhoppers. The difference is that the body color of two-spotted spider mites is pale yellow or yellowish-green, and there are no red individuals. They are nearly white with naked eyes, commonly known as "white spiders." 2. Occurrence and damage symptoms. Peanut leafhoppers occur in Zhaoyuan City for 10 to 20 generations in one year, and they are often clustered and lurking as they grow in the rhizosphere of the weeds or under the bark under the soil seams and peanut fields. Activities began in late March of the following year, and they were infested in peanut fields from late April to early May. In June and July, they occurred in the peak period, which can cause partial damage to the spring peanuts. With the arrival of the rainy season in mid-July, the occurrence of leafhoppers has been rapidly reduced. In August, if the weather is dry, it can happen again, causing damage during the peanut fruiting period. In mid-to-late September, the peanuts migrated to winter parasites after harvest and began wintering in late October. Peanut leaf clusters sucked and sucked juice on the back of the peanut leaf. The front of the damaged leaf was grayish and gradually yellowed, and the severely damaged leaves fell off. In the peak period of leaf blast, due to the formation of cocooning and silking, a layer of white silk screens on the surface of the peanut leaf can be seen on the plots with large densities, and a large number of peanut leaves are linked together, which seriously affects the photosynthesis of peanut leaves. , hindered the normal growth of peanuts, dried pods, and reduced production. 3. Control methods (1) Agricultural control. Rational rotation, to avoid the mutual transfer of leafhoppers between the host damage; timely deep-frozen peanuts after harvest, you can kill a large number of overwintering leafhoppers, but also reduce weeds and other host plants; weeds cleared fields, eliminating the overwhelming source of insects. (2) Chemical control. When the incidence of pests in the peanut field is found to be more than 20%, it is necessary to promptly control the spraying of pesticides. The spraying should be uniform and must be sprayed on the back of the leaves; in addition, the host plants such as weeds in the fields must be sprayed. Prevent its spread. The specific method is as follows: 15% of the cinnabar verrucosa single crop land can be uniformly sprayed with 2500-3000 times of the net emulsion of the broom lacquer, 73% of the emulsion of the chlordecone EC, or 20% of the chlorimal EC of 2000 times; The mixed plots of alfalfa and two-spotted spider mites were sprayed with 1% 7051 chrysanthemum emulsifiable concentrate (avermectin) 3000 times.
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