The frequency of occurrence of Grapholitha molesta(Busck)in single pear,peach and mixed pearpeach orchards in Laiyang
Author of the article:LIU YuGuang1GU SongDong1LI LiLi2ZHANG Bin1YU Yi2ZHENG ChangYing1
Author's Workplace:1. Key Laboratory of Integrated Crop Pest Management of Shandong Province, College of Agronomy and Plant Protection, Qingdao Agricultural University, Qingdao266109, China; 2. Shandong Academy of Agricultural Sciences, Jinan250100, China
Key Words:Crapholitha molesta, occuring regularity, single pear planting orchard, single peach planting orchard, mixed pearpeach planting orchard
Abstract:In order to clarify the frequency of occurrence of Grapholitha molesta (Busck) under different planting patterns including pear orchards, peach orchards and mixed pearpeach orchards in the Laiyang area, pheromone traps and an effective cumulative temperature model were used to forecast the number of generations of G. molesta in 20092012. The results show that: G. molesta has 4 generations per year in the Laiyang area. From April to August, the 1st3rd generations mainly occur in peach orchards whereas the 4th generation occurs in pear orchards from August to September. The last generation disappeared in the middle of October. The occurrence time of G. molesta on different hosts varied. In pear or peach orchards G. molesta can complete 4 generations. The 1st3rd generations were more numerous than the 4th generation in peach orchards. On the other hand, the 1st3rd generations were less numerous than the 4th generation in pear orchards.