Biology And Ecology Of Agrilus Mali Matsumura And Its Dominant Natural Enemies In Wild Fruit Forests In Xinjiang

Agrilus mali Matsumura(Coleoptera:Buprestidae)has same name as Golden beetle and undetr-cortex worm, it is an important wood-boring beetle attacking fruit tree. Its larvae eats the branches within the cortex, causing cortex depression, dry and dead branches, what the worse, it damage whole tree. Current reports about Agrilus mali Matsumura are mainly within study of planting orchard and it about wild fruit forest is very limited, mainly including the Agrilus mali Matsumura's occurrence and control methods, and there is no effective control measures against Agrilus mali Matsumura for wild fruit forest in Xinjiang. So we have carried on study about the biology and ecology of Agrilus mali Matsumura and its dominant natural enemies in the wild fruit forests so that we can find its biological control methods. We have basically made clear Agrilus mali Matsumura and its dominant natural enemy's biology and ecology, the main results and conclusions are as follows.(1) Agrilus mali Matsumura distributes from 960 to1700 meters above sea level. From investigations it mainly distributes in Gongliu county, MO village wild apple forests valley as well as Karabura village in Xinyuan county etc, which has caused serious damage.(2) Agrilus mali Matsumura has one generation a year. They overwintered as early larvae undetr cortex. The overwintered larvae begains to damage activity in mid of April. In mid of May, larvae begains to pupate.Adult begins to emerge in early June, with a peak in mid July, few of them continue to September. In mid of July, the female adult begains to oviposite, with a peak in mid August. In room temperature adult female life endures 18 days on average after emerge from wood, while male adult spans 20 days. Adult has no phototaxis, color tendency character. Agrilus mali Matsumura's eggs produce on the skin suture and base of branch.Larvae's life is longest in whole generation, and make harm to wild apple serious. Agrilus mali Matsumura pupa is naked pupa, the pupal period is 21 days in room observation.(3) By various distribution patterns measurement, we found Agrilus mali Matsumura's larva distribution is aggregate and such distribution is decided by it's own biological characteristics.(4) By research and identification, it is found that Agrilus mali Matsumura's dominant natural enemies is Atanycolus sp for wild fruit forest in Xinjiang .It loves sunshine and warm envirment. Male and female sex percentage is 1:1, It grows quickly in early of June and its max parasitism rate is 44.74%. It experiences 26 days from larva to adult at indoor observation, with eggs period, Atanycolus sp.'s one generation is 30 days.(5) Atanycolus sp.'s distribution is aggregate, such distribution is consistent of Agrilus mali Matsumura's.Through these investigations and researches, the biology and ecology of Agrilus mali Matsumura and its dominant natural enemy Atanycolus sp.have been solved primarily .These findings would consequentially contribute to the further successfully biological control of the bark beetle.