Research on the oriental fruit moth in cultivated pear orchards
Author of the article:ZHANG LiJun**ZHAO ZhiGuoLI YaYaWANG YiMA RuiYan
Author's Workplace:College of Agriculture, Shanxi Agricultural University, Taigu030801, China
Key Words:oriental fruit moth, pear orchard, mixed planted orchard, variety, tree age, fruit bagged, sex pheromone
Abstract:The oriental fruit moth (Grapholitha molesta (Busck)) is one of the main pests in pear orchards. In this paper, the abundance of this moth was investigated using sex pheromone traps in different pear orchards. The results showed that, abundance was highest in single pear orchard, where the daily average catch was as high as 10.9 moth/trap, significantly higher than in the other orchards. The abundance of moths was much higher in mixed peach & pear orchards than in pear orchards, in mixed pear & apple orchards and in single apple orchards. In addition, fruit bagging significantly reduced oriental fruit moth damage; daily average catches in unbagged pear orchards were 13.8 moth/trap, 1.52 times the amount caught in bagged orchards. The results also indicated that different varieties and ages of pear trees differ significantly in resistance to the oriental fruit moth. The daily average catch in Carrisp pear orchards was 2.21 times higher than in Bartlett pear orchards suggesting that Carrisp pears are less resistant to the oriental fruit moth than Bartlett pears. The daily average catch was 12.5 moth/trap in 40 years old Carrisp pear tree orchards, which was 2.5 times of the amount in 20 years old orchards.