By investigation on the damage of longhorned beetles on poplar,it was found that the damage rate decreased with the increase of plant to pest origin.For the trees planted in the current year, 84.9% of notch was distri...By investigation on the damage of longhorned beetles on poplar,it was found that the damage rate decreased with the increase of plant to pest origin.For the trees planted in the current year, 84.9% of notch was distributed in the area 1 meter above the ground,while for 2-year-old trees,the notchs were distributed mainly in the area 2 meters above the ground,which took 75.8% of the total.Two pesticides (Fenitrothion and Luseweilei) were used to control the insect and the results showed that both pesticides could control the insect effectively.When Luseweilei was used,but the notch rate and number seemed to be higher compared with that when Fenitrothion was used,but the former could make higher insect mortality rate than latter.展开更多
文摘By investigation on the damage of longhorned beetles on poplar,it was found that the damage rate decreased with the increase of plant to pest origin.For the trees planted in the current year, 84.9% of notch was distributed in the area 1 meter above the ground,while for 2-year-old trees,the notchs were distributed mainly in the area 2 meters above the ground,which took 75.8% of the total.Two pesticides (Fenitrothion and Luseweilei) were used to control the insect and the results showed that both pesticides could control the insect effectively.When Luseweilei was used,but the notch rate and number seemed to be higher compared with that when Fenitrothion was used,but the former could make higher insect mortality rate than latter.
