Control methods of longan gall mite

The damage was caused by sucking juice in the terminal buds and spikes of longan shoots, which led to the shortening of spike internodes, and the florets could not bloom and develop into bloated flowers for a long time. Fruit growers in Guangdong are commonly known as "ghost flowers"; the new shoots are arched and claw-shaped, and the leaf edges curl inside, which can not be spread out. Fruit growers call them ghost shoots, especially the ghost flowers can not produce a serious impact on the yield. The morphological characteristics of adult mites and nymph mites are small and invisible to the naked eye, the shape of carrot can be seen under high power magnifying glass, and the number of dense rings on the back and ventral side of litchi gall mite is similar. The occurrence characteristics of gall mites like shade and fear of light, so they mostly occur in the undeveloped compound leaves of the new shoots of the inner chamber shade branches. In the middle of the year, the insect population density is the highest, more than 100 gall mites can be hidden in a floret, and there are mites in the ovary and anther, followed by autumn tip and summer shoot. The gall mites in the shoot stage were mainly concentrated in the terminal bud, and the transfer activity appeared in the compound leaf stratification and leaf expansion stage. Prevention and control methods 1. Cut off the "ghost flowers" and "ghost tips" and then clear the garden for treatment. 2. Planting thistle in the garden and surrounding open space to facilitate natural enemies to prey on mites to inhabit and breed. 3. Spraying in the active stage of the transfer of the leaf gall mite in the new shoot. Use 20% diclofenac EC 800ml 1000 times or 40% omethoate 1000 times.