Abstract
Aerial application tests with a biological insecticide (Thuricide$^{(R)}$) and two low toxicity insecticides, Diflubenzuron (Dimilin$^{(R)}$) and Triflumuron (Alsystin$^{(R)}$) were carried out against the fall webworm (Hyphantria cunea Drury). For experimental application by helicopter, dilutions of 30x and 45x Thuricide, 180x and 240x Alsystin, and 180x Dimilin were utilized. The solutions were applied at a rate of 30 liters per hectare. The results are as follows: 1) All treatments, Dimilin 25% wp, Thuricide wp, and Alsystin 25% wp, were found to very effec tive against fall webworm larvae. Percentages of mortality averaged between 93.9% and 97%. 2) No significant differences in percentages of larval kill were found between dilutions of Thuricide (30x and 45x) or Alsystin (180x and 240x). 3) Assessment of parasite densities in the treated areas 35 days after treatment indicated that percentages of reduction for all five species found, including Brachymeria lasus(Walker) (=obscurata [Walker]), were lower than for areas treated with the conventional insecticide Diplox$^{(R)}$ (trichlorfon) 25% wp. In particular, the percentage of reduction in Thuricide-treated areas was only 21% as compared with the untreated (control) areas. 4) Aerial applications of Dimilin were very effective and economical for control of the fall webworm by comparison with [aerial] applications of Thuricide.
생물농약(生物農藥)인 Thuricide(Bacillus thuringiensis)와 저독성약제(低毒性藥劑)인 Dimilin 및 Alsystin 등(等) 3종(種)의 저독성약제(低毒性藥劑)에 의(依)한 미국흰불나방(fall webworm) 유충에 대(對)한 항공살포효과시험(航空撒布效果試驗)을 실시(實施)한 결과(結果)는 다음과 같다. 1) Dimilin 25% wp, Thuricide wp, Alsystin 25% wp 등(等) 공시약제(供試藥劑)들은 평균(平均) 93.9${\sim}$97%의 높은 살충효과(殺?效果)가 있었다. 2) Thuricide 30배(培) 및 45배액(培液)의 미국흰불나방유충(幼?)에 대(對)한 구제효과(驅除效果)는 각각(各各) 92%와 96%로서 Diplox(trichlorfon)제(劑)와 비등(比等)하였다. 3) Dimilin 25% 및 Alsystin 25% wp의 구제효과(驅除效果)는 98% 이상(以上)으로서 미국흰불나방유충(幼?)에 특효(特效)하였다. 4) 약제처리후(藥劑處理後) 조사(調査)된 기생성천적류(寄生性天敵類)(parasites)는 무늬수중다리좀벌(Brachymeria lasus Walker) 외(外) 4종(種)이었으며 개체수(個體數)는 Thuricide 처리구(處理區)에서 가장 많았다. 5) 공시약제(供試藥劑)들에 대(對)한 경제성(經濟性)(약제화(藥劑化))은 Diplox 제(劑), Dimilin 제(劑), Thuricide의 순(順)이었으며 특(特)히 Thuricide는 Diplox 제(劑)의 약(約) 5배(倍)로서 극(極)히 낮았다.