스프링클러시스템을 이용한 잣나무 채종원의 구과해충 방제에 관한 연구

Abstract

-In order to prevent cones from being damaged by cone insects, Gravitarmata margarotanaand Dioryctriaabietella, sprinkler system was installed on the Pinus koraiensisSeed Orchard. Such a test was conducted at Chung-ju,Chungcheong buk-do, Korea in 2002. Insectides of Diflubenzuron 25% WP 2,500 and Cyfluthrin 2%EC 1,000 weresprayed at fifteen-day and twenty-day intervals during the period of insects adult occurrence by sprinkler system. TheGravitarmata margarotanagenerally emerged for about 53 days from middle April to early June, and peak emergencewas 10 days from April 20 to April 30. Dioryctria abietellagenerally emerged for about 108 days from late April toearly August, and peak emergence was 10 days from May 20 to May 30. Damage rate of cones were 8.79.7% and10.9 12.7% on average with crown insecticide spraying with Cyfluthrin and Diflubenzuron, while 67.5% when nottreated. Control effectiveness of this insecticide spraying was 85.6~87.1% and 83.9%81.2%, respectively. When itconsiders the forest environment, it is recommended diflubenzuron which is low toxic pesticide. In conclusion, effectualtimes and number of diflubenzuron 25% WP application with sprinkler system against cone insects were from early Maythrough late August and six times at twenty-day interval.Key words - Seed orchard, Cone insects, Insecticide, Sprinkler system, Diflubenzuron, Occurrence- 94 -