Forest Experiment on the Control of Pine Wilt Disease by Injecting Different Pesticides into Tree Trunks
In order to explore the forest control effect of pesticide trunk injection on pine wood nematodes in pine trees,in this experiment,6 pieces of 100 pine trees with a diameter at breast height of about 25cm were selected from a state-owned forest farm in Qinzhou,Guangxi.A total of 6 groups were set up,with 100 trees in each group,including a control group,a 20％avermectin emulsion group,a 0.3％bitter bean alkaloid aqueous group,a 10％methoxazole imidacloprid soluble group,a 5％high-efficiency chlorpyrifos emulsion group,and a 5％imid-acloprid injection dry group;The control group was injected with an equal amount of water,while the other drug groups were injected with corresponding chemical agents;a survey on the withering and death of experimental pine trees from 2020 to 2023 is conducted.At the same time,the number of lured black longhorn beetles at the end of October each year is counted;The control effect of the 20％avermectin emulsion group was the best.The for-est control rates of the group in 2020,2021,2022,and 2023 were 80.74％,78.48％,74.06％,and 70.57％,respec-tively,with control rates all higher than 70％.As the years increased,the forest control rates of each group gradu-ally decreased,and the control rates of the 20％avermectin emulsion group were significantly higher than those of the other drug groups(P＜0.05);The second most effective group in terms of prevention and control was the 10％metformin imidacloprid soluble group.The prevention and control rates of the 10％metformin imidacloprid solu-ble group in 2020,2021,2022,and 2023 were higher than those of the 5％high-efficiency chlorpyrifos emulsion group;Five types of tree trunk injection drugs were used to trap pine black beetles.The 5％imidacloprid injection group＞0.3％bitter bean alkali water group＞10％methomyl imidacloprid soluble group＞5％high efficiency chlorpyrifos emulsion group＞20％avermectin emulsion group were used.Among them,there was no significant difference in the number of pine black beetles captured between the 20％avermectin emulsion group and the 5％high efficiency chlorpyrifos emulsion group(P＞0.05);There was no significant difference(P＞0.05)in the num-ber of pine black beetles captured between the 0.3％bitter bean alkaloid water group and the 5％imidacloprid in-jection dry group,but both were significantly higher than the 20％avermectin emulsion group and the 5％high-efficiency chlorpyrifos emulsion group(P＜0.05);The best effect is achieved by injecting 20％avermectin emul-sion into tree trunks,followed by 5％high-efficiency chloramphenicol emulsion.
pharmaceuticalstree trunk injectionpine wilt diseaseprevention and controleffect
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