• 제목/요약/키워드: biology major

검색결과 2,041건 처리시간 0.033초

배과원에서 발생하는 주요 나방류 해충의 발생양상 및 환경친화적 방제 (Seasonal occurrence of major moth pests and their environmental friendly control in pear orchard)

  • 서미자;박민우;윤규식;조신혁;조창욱;신효섭;권혜리;강민아;김세희;유용만;윤영남
    • 농업과학연구
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    • 제38권1호
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    • pp.39-44
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    • 2011
  • The changes in major moth populations were monitored by sex pheromone traps in pear orchards at Yuseong-Gu, Daejeon from 2008 to 2010. Among four major moths, Grapholita molesta and Caposina sasakii occurred most frequently. Their occurrences peaked 2 to 3 times during the growing season from May to September. G. molesta was exceptional, occurring until September. For the environmentally-friendly control of these moths, 9 control materials including insect pathogenic bacteria and environmentally-friendly agricultural materials, were examined on the larva of 4 kinds of moth and sprayed on pear leaves in the field. As the generalized results of bioassay, Bacillus thuringiensis subsp. kurstaki and Sophora flavescens extract were shown to have better control effects than any other control material.

감성돔(Acanthopagrus schlegelii) 및 참돔(Pagrus major) 치어에 대한 이산화염소(ClO2)의 급성 독성 (Acute Toxicity of Chlorine Dioxide (ClO2) to Juvenile Black Seabream Acanthopagrus schlegelii and Red Seabream Pagrus major)

  • 이옥;서준혁;서형원;장다희;이재만;최태건;박정환
    • 한국수산과학회지
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    • 제53권3호
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    • pp.451-455
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    • 2020
  • This study evaluated acute toxicity of chlorine dioxide (ClO2 ) to juveniles of black seabream Acanthopagrus schlegelii (19.4±2.3 g, 10.7±0.4 cm) and red seabream Pagrus major (74.9±8.2 g, 15.9±1.0 cm). Thirty juveniles for each species were exposed to target ClO2 concentrations of 0, 0.05, 0.1, 0.125, 0.15, 0.2, 0.3, 0.4, and 0.5 mg/L in triplicate for eight days. Half lethal concentrations for 96 hours were found at 0.14 and 0.24 mg ClO2/L for black seabream and red seabream, respectively. Red seabream larger than black seabream in body weight appears to be more resistance to chlorine dioxide. However, regardless of species or size, specific loading rates of chlorine dioxide to total fish weight (daily feeding amount of ClO2/total fish weight) were similar, showing 1.3 and 1.1 g ClO2/kg fish·day-1 for black seabream and red seabream.