Studies On The Occurrence Of Main Apple Mites In Longdong

Hawthorn spider mite, Tetranychus urticae, Panonychus ulmi are the principal victims of apple mites. They are one of the main reasons which caused by falling leaves and apple production. Tetranychus urticae which found that damage from the beginning, a number of orchards in the north has become an important population in recent years, Caused serious harm to the fruit production. This paper studied the mite major ecological damage and ecological control in the the apple orchard of fruit trees of Jingning. The main contents and conclusion are as follows:The result showed that: The winter egg start hatching in late March to early April. The annual peak appear in May to July. Winter-type of an adult female mite and winter diapause egg appear in August to September. There most pest mites distribute in the middle layer of Apple P1ant, Following are the upper, the lower layer was the least. There were 57% mites distribute in both sides of leaf nervure vein and floor of leaf,53% eggs distribute in both sides of leaf nervure vein,floor of leaf cushion and lacunose place on rear of leaf.The spatial distribution pattern of Apple pest mites.Mixed populations of pest mites in the various periods are gathered in the distribution of crown. Population density in the lower, gathered is caused by the environment reasons. Population density in the higher, gathered is caused by their habits. Aggregation behavior and environmental heterogeneity common result in the aggregation behavior of mixed populations.The type of pest mites and the distribution of spatial pattern in Apple orchard .The spatial distribution pattern of pest mites over-wintering Estrogen-mite on Platycladus orientalis furits of apple Jingning were determined by means of several indexes of aggregation and regression methods,The results showed that over-wintering Estrogen-mite on the apple trees are belonging to aggregation distribution which was resulted in by over-wintering Estrogen-mite of pest mites adult or affected by environmental factors.Ecological controls of Apple pest mites.Amblyseius cucumeris introduction of Apple mite predation harm.Through the observation of Amblyseius cucumeris predatory behavior are mainly include the search, capture,use,cleaning, resting, etc. Amblyseius cucumeris state of the pest mite mites is degree of order of preference: Eggs> Nymph mites> Adult mite> Young mitesThe hibernation period of the barrier blocking the role of agent.They can effectively prevent their migration to the tree by smearing the drug on fruit tree ring. To reduce the rate of climbed up the tree and the population base was down. Investigate the relative effect of 77.883%, can significantly decrease the risk of the role of the frequency of spraying.