Korean journal of applied entomology (한국응용곤충학회지)

Korean Society of Applied Entomology (한국응용곤충학회)
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Economic Injury Level of the Striped Cabbage Flea Beetle, Phyllotreta striolata (Coleoptera: Chrysomelidae), on Chinese Cabbage

시설배추에서 벼룩잎벌레의 경제적 피해수준 설정

  • Lee, Young Su (Environmental Agricultural Research Division, Gyeonggi Agricultural Research and Extension Services) ;
  • Kim, Jin Young (Environmental Agricultural Research Division, Gyeonggi Agricultural Research and Extension Services) ;
  • Hong, Soon Sung (Environmental Agricultural Research Division, Gyeonggi Agricultural Research and Extension Services) ;
  • Park, Hong Hyun (Crop Protection Division, National Academy of Agricultural Science, RDA)
  • Received : 2013.10.16
  • Accepted : 2014.01.20
  • Published : 2014.06.01
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Abstract

This study was conducted to determine the economic injury levels and control thresholds for the striped cabbage flea beetle, Phyllotreta striolata (Coleoptera: Chrysomelidae), on Chinese cabbage at two different planting times. The number of inoculated adults per 10 cabbages was 0, 2, 4, 8, and 16 at the early developmental stage of the cabbage5 days after planting) and 0, 10, 20, 30, and 40 at the middle developmental stage (30 days after planting). Damages to the leaves at the first inoculation were 2.5-21.1% and at the second inoculation were 1.8-26.3% after harvesting. The linear relationships between population density and yield reduction were as follows: Y = 1.3475X + 2.135 ($R^2$ = 0.8699) at the early developmental stage and Y = 0.703X - 1.78 ($R^2$ = 0.966) at the middle developmental stage. On the basis of these results, the economic injury levels caused 5% loss of yield; there were 2.1 adults per 10 Chinese cabbage at the early developmental stage and 9.6 adults per 10 Chinese cabbage at the middle developmental stage.

시설 배추 벼룩잎벌레의 발생밀도와 피해량을 상호 분석하고 요방제 수준 설정을 통해 신속하고 합리적인 방제체계를 확립하고자 본 시험을 수행하였다. 시설 봄배추 생육초기 벼룩잎벌레 성충 접종밀도(X)와 수량감소율(Y) 관계는 Y = 1.3475X + 2.135, $R^2$ = 0.8699이었다. 시설 봄배추 생육중기 벼룩잎벌레 성충 접종밀도(X)와 수량감소율(Y) 관계는 Y = 0.703X - 1.78, $R^2$ = 0.966이었다. 이와 같은 결과를 토대로 시설 배추 봄 재배시 접종한 성충밀도와 배추 피해지수간의 상관성을 바탕으로, 수량 감소율(gain threshold, 수익역치) 5%로 전제한 벼룩잎벌레 요방제 밀도는 배추 생육초기 발생시 10주당 2.1 마리, 생육중기 발생시 10주당 9.6마리로 분석되었다.

Keywords

References

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