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전흥용(Heung Yong Jeon),김형환(Hyeong Hwan Kim),양창열(Chang Yeol Yang),장한익(Han Ik Jang),목일진(Il Gin Mok),임명순(Myoung Soon Yiem) 한국원예학회 2005 원예과학기술지 Vol.23 No.3
살충제의 과다 사용을 줄이기 위하여 배추좀나방의 피해와 방제 결정 수준에 대한 연구를 수행하였다. 배추좀나방 유충의 령기별 섭식량은 2령충이 5.5㎟, 3령충이 10.3㎟, 4령충이 83.9㎟로 령기가 높을수록 많았다. 배추좀나방 유충과 암컷성충을 배추 유묘에 각각 6마리와 4마리를 처리했을 때 유충은 20일, 암컷 성충은 21일후 5엽 전체가 피해를 받았다. 배추좀나방 2령충의 접종밀도에 따른 배추의 유묘기(50일 묘)와 외엽신장기(70일 묘) 수량 손실률은 유묘기에는 무처리, 1, 2, 4, 6 및 8마리 접종구에서 각각 0, 12, 32, 60, 90 및 100%였고, 외엽신장기에는 0, 4, 14, 34, 70 및 90%였다. 접종 마리수 별 손실률을 회귀식화하면 유묘기가 y=13.2x+2.8, 외엽신장기가 y=11.92x-6.37이었다. 회귀식에 자연 손실률 5%를 대입하여 방제 결정 수준을 계산한 결과 유묘기에는 주당 0.2마리, 외엽신장기에는 주당 1.0마리였다. The study was investigated the damage and control threshold of the diamondback moth (Plutella xylostella), giving cut down the amount of insecticide. The consumption quantity of the diamondback moths was 5.5 ㎟ in 2nd instar, 10.3 ㎟ in 3rd instar, and 83.9 ㎟ in 4th instar. When diamondback moth larva and female adult were treated with six and four each per seedling, five leaf whole received a damage at 20 days after larva treated, while that of the female adult was 21 days. The loss was 0% for non-treated, 12% for one larva, 32% for two larvae, 60% for four larvae, 90% for six larvae, and 100% for eight larvae when the diamondback moth 2nd instar was inoculated different density in the young seedling period (50-days seedling). At outside leaf elongation period (70-days seedling), the loss was 0% for non-treatment, 4% for one larva, 14% for two larvae, 34% for four larvae, 70% for six larvae, and 90% for eight larvae. When the loss ratio was transformed, the equation of regression was y = 13.2x + 2.8 in young seedling period and y = 11.92x - 6.37 at outside leaf elongation period. The loss ratio was substituted in the expression of regression and estimated occurrence density. Considering a natural loss ratio of 5%, the control threshold of the diamondback moth at the young seedling period was 0.2 larva per plant and 1.0 larva at outside leaf elongation period in a Chinese cabbage.