목초액을 이용한 오리나무벌레의 방제
Control of Japanese alder leaf beetle, agelastica coerulea using wood vinegar
목초액 오리나무잎벌레 방제 산림자원학 임학;
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This study was carried out to furnish the basic informations for control methods of Alder leaf beetles and effect of economic retrenchment by controlling those with various mixing methods of agricultural chemicals and vinegar. The results obtained are as follows ; 1. Occurrence percentage of Alder leaf beetles began to decrease from 1985 continuously and the most decreased in 1995. It began to increase from 1996 to 1999 but showed a declining tendency again in 2002. 2. In field and laboratory experiment on larvae, the insecticide rate was the highest at the A treatment site(agricultural chemicals 100% site), and second at the E treatment site(vinegar 300times +agricultural chemicals 30% reduction site), and was the lowest at B treatment site(vinegar 500times +agricultural chemicals 50% reduction site). 3. In the field and laboratory experiment on adults, the insecticide rate showed the same tendency as results of larvae experiment. 4. In the change of soil chemical properties before and after control experiment, soil pH showed the severe acidity as pH4.1∼ pH4.6, and T-N and OM contents were not a difference between treatment sites as 2.4g/kg∼7.0g/kg and 23.8g/kg∼74.0g/kg, respectively. 5. Comparing control cost of Alder leaf beetles on the basis of A treatment site(agricultural chemicals 100% site), it was a little expensive at E treatment site but inexpensive at the other treatment sites.