论文部分内容阅读
梨枝圆盾蚧在陕西省苹果园1a发生3代。主要为害时期为越冬代4～5月,第1代6～7月,第2代8～9月。此虫主要为害苹果树枝条,而以为害果实造成的经济损失最大。防治上应重点抓好冬春修剪有虫枝条,保护利用天敌,以及果树开花前越冬代若虫期和6月上中旬第1代初龄若虫期的化学防治。
Pear branch jackdaw insects occurred in apple orchard 1a in Shaanxi Province 3 generations. The main damage period for the winter 4 to May, the first generation 6 to 7 months, the second generation 8 to September. The insects mainly affect the apple tree branches, while the damage caused by the fruit of the largest economic losses. Prevention and control should focus on grasping the winter and spring pruning branches, protection and use of natural enemies, as well as fruit trees before flowering Nymph nocturnal and early June in mid-early first-instar nymphs of the chemical control.