The toxicity of an IGR class insecticide, Diflubenzuron on silkworm, Bombyx mori and abnormal symptoms

IGR계 농약 diflubenzuron의 독성과 누에이상증상

  • Park, Kyung-Hun (Department of Crop Life Safety, National Institute of Agricultural Science and Technology(NIAST), Rural Development Administration(RDA)) ;
  • Kim, Byung-Seok (Department of Crop Life Safety, National Institute of Agricultural Science and Technology(NIAST), Rural Development Administration(RDA)) ;
  • Park, Yeon-Ki (Department of Crop Life Safety, National Institute of Agricultural Science and Technology(NIAST), Rural Development Administration(RDA)) ;
  • Lee, Hee-Dong (Department of Crop Life Safety, National Institute of Agricultural Science and Technology(NIAST), Rural Development Administration(RDA)) ;
  • Jeong, Mi-Hye (Department of Crop Life Safety, National Institute of Agricultural Science and Technology(NIAST), Rural Development Administration(RDA)) ;
  • You, Are-Sun (Department of Crop Life Safety, National Institute of Agricultural Science and Technology(NIAST), Rural Development Administration(RDA)) ;
  • Sohn, Bong-Hee (Department of Agricultural Biology, NIAST, RDA) ;
  • Kang, Pil-Don (Department of Agricultural Biology, NIAST, RDA)
  • 박경훈 (농촌진흥청 농업과학기술원 농산물안전성부) ;
  • 김병석 (농촌진흥청 농업과학기술원 농산물안전성부) ;
  • 박연기 (농촌진흥청 농업과학기술원 농산물안전성부) ;
  • 이희동 (농촌진흥청 농업과학기술원 농산물안전성부) ;
  • 정미혜 (농촌진흥청 농업과학기술원 농산물안전성부) ;
  • 유아선 (농촌진흥청 농업과학기술원 농산물안전성부) ;
  • 손봉희 (농촌진흥청 농업과학기술원 농업생물부) ;
  • 강필돈 (농촌진흥청 농업과학기술원 농업생물부)
  • Published : 2007.12.30

Abstract

Surveying, laboratory and field trial were performed to elucidate the causes of non-spinning syndrome of silkworm, Bombyx mori, abnormal symptoms of silkworm instars observed in certain sericultural fanning region. Mortality and growth of silkworm was still influenced by feeding the mulberry leaves sprayed with 10,000 fold diluted solution of standard spray of diflubenzuron WP (25%). Mortality and growth of silkworm fed with diflubenzuron-sprayed mulberry leaves with recommended spray solution were entirely affected even six weeks after spraying irrespective to the instars. Larval period of 5th instar and cocooning duration of silkworm was not affected in case 50m of buffer zone has maintained in near-by orchard field sprayed with diflubenzuron WP (25%). However, survival rate of pupae was not influenced in case 100 m of buffer zone has kept. Insect growth regulating insecticides were required to keep a certain distance of buffer zone when sprayed with water-diluted solution, 100 m from the application site at least in order to prevent contamination of the spraying drift by the chemicals.

IGR계 농약은 곤충에는 독성이 강할 뿐만 아니라 내분비계에도 영향을 미치는 것으로 알려져 우리나라에서는 최근 관찰된 누에 미화용 현상의 원인으로 추정되기도 하여 본 연구는 가장 많이 사용된다고 알려진 IGR계 농약 diflubenzuron의 누에에 대한 독성을 평가하였다. 누에에 대한 급성독성시험과 뽕잎잔류 독성시험 결과에 의하면 diflubenzuron은 표준살포액을 10,000배 희석한 액에 노출된 누에에도 치명적 피해를 입히는 것으로 나타났고, 6주전에 야외에서 표준살포농도로 살포한 뽕잎을 급여하여도 누에가 치사되는 등 독성이 매우 강하였으나 최근 농가에서 나타난 미화용 현상은 관찰되지 않았다. 또 과수원으로부터의 비산을 가정하여 과수원에 diflubenzuron WP (25%)를 살포하고 거리별로 뽕잎을 채취하여 누에에 섭식시킨 결과, 바람이 부는 방향으로 50 m 까지만 화용비율에 영향을 미친 것으로 나타나 과수원에서 비산된 diflubenzuron의 피해를 막기 위해서는 100 m 정도의 안전거리를 둘 것을 추천한다.

Keywords

References

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