Occurrent Dynamic of Psylla chinensis in Haicheng Region and Field Efficacy of Four Insecticides Against This Pest(PDF)

《北方园艺》[ISSN:1001-0009/CN:23-1247/S]

Title:: Occurrent Dynamic of Psylla chinensis in Haicheng Region and Field Efficacy of Four Insecticides Against This Pest

Author(s):: LI Jie-ping¹; ZHAO Zhang-wu¹; ZHOU Xu-ling²; 1.Department of Entomology，China Agricultural University，Beijing 100193；
2.Institute of Pomology，Shanxi Academy of Agricultural Sciences，Taigu，Shanxi 030815

Keywords:: Psylla chinensis; occurrent dynamic; insecticides; field efficacy

Abstract:: Taking 15 years old Nanguo pear as material,the growth and decline law of different instars of Psylla chinensis Yang in Haicheng region，Liaoning Province was studied and compared.Moreover，the field efficacy treated at peak period by four insecticides of high efficiency against P.chinensis 3，5 and 10 days after treated were separately investigated.The results showed that occurrence of P.chinensis about 5 generations a year，had obvious overlapping generations during the growing period of Nanguo pear.Nymph lasted 14~15 days with a peak around each month.The population size and peak occurred from 1st to 3rd instar were separately 475 nymphs on May 14th，403 nymphs on July 18th and 612 nymphs on August 16th.The nymphs from 4th to 5th instar occurred a peak each month at earlier stage and decreased in number at later stage.Adults always were maintained at around 20.Besides，the numbers of P.chinensis on young trees were much more than on old ones.Moreover，the results also showed that the control efficacy of this pest by 1.8% of avermectin (2 000×) and 1% of matrine (1 000×) were the best.

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Last Update: 2014-08-25