Effectiveness of Several New Insecticides Applied on the Water-surface for the Control of the Rice Stem Borer, Chilo suppressalis Walker, in the 2nd Generation

이화기이화명충에 대한 살충제의 수면시용효과비교시험

1. This experiment was planned to compare the effectiveness of Diazinon granular and gammadol dust with the low toxic organophosphorus insecticides applied on the water-surface for the control of the rice stem borer, Chilo suppressalis Walker, in the 2 nd generation and to determine the proper timing of those insecticidal applications at Suwon, Korea, in 1964. 2. The hatching larvae from the eggs were inoculated on the rice plants in pots and insecticides were applied on the water-surface of pots at a given day intervals. The dose of insecticides used per pot was calculated from the 120g. as a actual ingredient per 10 a. The number of living larvae was observed at the 20 days later from the inoculation (as shown in Table 1.). 3. As shown in Table 2 and 3, there was highly significance between the chemicals and L.S.D. was 24.22. The best effectiveness was Diazinon granular and 2nd was gamma-dol dust. The organophosphorus emulsion concentrations used in this experiment were less effective than two other insecticides. Although there were some suspicious results according to the day intervals inoculated, the order of effectiveness was Diazinon>gamma-dol>Sumithion>EM>EPN> Cidial as the total moan. 4, As shown in Table 2 and 3, there was no significance between the timing of insecticidal applications, but, m the whole, Diazinon granular was most effective at a given day intervals in this experiment and gamma-dol also was effective at the day Plot inoculated. The proper timing of EPN, EM, and Cidial seemed to be at e day plot inoculated and that of Sumithion at the day plot before inoculation.

1. 본 시험은 저독성유기인제(유제)를 수면시용하여 수면시용제인 Diazinon 입제 및 $\gamma-dol$ 미분제와의 효력 및 시용시일을 비교 검정하려는데 있다. 2. 제 2화기이화용충을 부화 직후 pot에 재식한 수도에 접종하고 각약제는 10 a 당 유효성분량을 120g으로 하고 이에서 환산하여 일정량을 pot내 수면에 시용하였으며 이의 살충효과로써 비교검정하였다. 3. Table 2와 3에서 보는 바와 같이 약제간에는 고도의 유의성을 나타내었고 그의 L.S.D.=24.22였다. Diazinon 입제의 효력이 가장 좋았고 $\gamma-dol$ 미분제가 다음이었다. 그리고 타약제는 효력이 훨씬 낮았다. 시용시에 따라 차이는 있었으나 본시험기일내 전체평균으로서 보면 Sumithion, EM, EPN 및 Cidial의 순위로 살충효과가 낮았다. 4. 시용시일별구간에는 유의성은 인정할 수 없었으나 대체로 Diazinon 입제는 본시험기간중 모두 좋은 살충효과를 나타내었고 $\gamma-dol$도 충접종당일시용구를 제외하고는 살충효과가 모두 좋은 편이었다. EPN, EM 및 Cidial은 충접종당일시용구에서 가장 높은 살충율을 보였고 Sumithion은 충접종전 5일째 시용구에서 가장 높은 살충율을 보여 주었다