艾蒿提取液对茶尺蠖控制效果及其机理的初探.pdfVIP

shows that susceptible cultivarsinsect-resistance could be enhanced by the extract in a larger range than insect-resistant cultivars. 3. We measured activities of PPO,POD and AChE in the bodies of 3rd instar larvaes of Ectropis obliqua Prout after eating tea leaves which is treated by different extracts.The result is that the activity of each treatment is different trends, in the endthe experimental group’s activities are inhibited by certain.The inhibition of PPO and POD activity appeared relatively late,but AChE activity was inhibited beginning in each treatment, the inhibition rate of AChE activity peaked at 24h, after gradually decreased with time.There are significant difference between the different treatments, each time period,the inhibition rate of the Deltamethrin group is the highest,the mixture of Deltamethrin and extract group was higher than the extract group. 4. The survived larvaes after eating the tea leaves treated with the extract had a significant difference in the length and weight compared with the control group. For mature larvaes survived from the Longjing43 which was treated with 100mg/mL concentration of the extract, its length and weight were 18.71mm and 52.03mg respectively, while the length and weight of larvaes in the control group were 23.18mm and 109.05mg. For larvae survived from the Fuyun6, its length and weight was the shortest and lightest. Larvae were heavier and longer than the control group when the extract’s concentration was 10mg/ml. There was a negative correlation between the length and weight of larvae and the concentration of extracts, that is to say, the higher the concentration is, the slower length and weight it g