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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
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.