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Economic Threshold for the Diamondback Moth (Plutella xylostella L., Lepidoptera: Plutellidae) on Leaf Broccoli (Brassica oleracea var. botrytis italiana)

잎브로콜리에서 배추좀나방 요방제 수준 설정

  • Choi, Seon Wu (Jeollabuk-do Agricultural Research and Extension Services) ;
  • Lim, Ju Rak (Jeollabuk-do Agricultural Research and Extension Services) ;
  • Kim, Ju-Hee (Jeollabuk-do Agricultural Research and Extension Services) ;
  • Lee, Gong-Jun (Jeollabuk-do Agricultural Research and Extension Services) ;
  • Moon, Young-Hun (Jeollabuk-do Agricultural Research and Extension Services) ;
  • Cheong, Seong-Soo (Jeollabuk-do Agricultural Research and Extension Services) ;
  • Lee, Gi-Kwon (Jeollabuk-do Agricultural Research and Extension Services)
  • Received : 2013.07.17
  • Accepted : 2015.01.25
  • Published : 2015.03.01

Abstract

This study was conducted to estimate the economic injury level (EIL) to leaf broccoli (leaf vegetable) by the diamondback moth (Plutella xylostella L.) in 2007 and obtain basic data for pest management. To investigate the relationship between initial density of diamondback moth larvae and broccoli leaf yield, experimental plots with five treatments (0, 0.5, 1.0, 1.5 and 2.0 larvae per plant) as initial density were established. We inoculated larvae on cheesecloth covering to survey changes in larval density. When grown for consumption, leaves of broccoli are harvested in periods. High levels of larvae were associated with significant reductions in leaf yield. There were 0%, 15%, 35%, 42%, 44% yield reductions due to a density of 0, 0.5, 1.0, 1.5, 2.0 diamond back moth larvae per plant, respectively, 25 days after larva inoculation. The regression equation used to predict leaf yield based on the number of initial larvae per plant was y = 1636-394x($R^2=0.79^{***}$>). EIL of the diamondback moth on leaf broccoli was 2~3 larvae per 10 plants for a damage level of 5%. The economic threshold was 1~2 larvae per 10 plants. Thus, diamondback moth management should be initiated when 1~2 larvae appear on 10 plants.

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