Study On Harmless Management Of Main Plant Deseases And Insect Pests On Chaenomeles Spciosa(Sweet) Nakai

Investigation on the occurrence of plant diseases and insect pests on Chaenomeles lagenaria(loisel)Koidz in Chang-yang county, the main plant diseases and insect pests are fruits mothes and aphides and brown rotten disease. Study on the occurrent law and injuried characteristic of these plant diseases and insect pests and the harmless management and detect the dissipation and final residues of in common used pesticide, results show that:The main moth on Chaenomeles spriosa (Sweet) Nakai fruits are Grophoita molesta [Busck] and Grapholitha molesta [Busck], also little Dichocrocis punctiferalis Guenee. Grophoita molesta[Busck] occur only 1 generation one year, Grapholitha molesta [Busck] occur 3 to 4 generations, Dichocrocis punctiferalis Guenee occur 2 generations. The moth mainly injure the fruits in the top and middle of the trees, the fruit-eaten rate in the top will reach 51.04%, which is the most; when the injured degree blew 2, the fruits almost couldn't fall from the trees; but when the injured degree reach 2 or more, there will be a large number of fruits fall from the trees.The synthetic sex pheromone can effectively traped male adults of fruits mothes. When prevent and control Grophoita molesta [Busck] and Grapholitha molesta [Busck], the two synthetic sex pheromones should place interval some distance. When placed interval 10m, and hanged in height of 1.5m,the effect is best. The synthetic sex pheromone could forecast the occurrent fastigium of the larvas of the fruit mothes, guide chemical prevention and control in the most appropriate period which is 4-10 days late fastigium of adults eclosion, and reduce chemical prevention and cotrol 2 to 3 times, and obviously reduce eaten-fruit rate. The field experimentation of prevention and control in pesticides shows that besides in common used pesticide , 2.5% lambda-cyhalothrin EW 4000X or 10% chlorfenapyr SC 1000X or 0.4% cnidiadin EC 1600X could effectively prevent and control fruit moth.Myzus persicae were prevail in plantation of Chaenomeles spciosa, occurrence degree had no relative with altitude , but had direct ratio with the number of summer...