The Korean Journal of Pesticide Science (농약과학회지)

The Korean Society of Pesticide Science (한국농약과학회)
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Economic Injury Levels of Spoladea recurvalis on Beet in the Plastic Greenhouse

비트 흰띠명나방의 경제적 피해수준 설정

  • Kim, Ju (Jeollabuk-do Agricultural Research and Extension Services) ;
  • Choi, In-Young (Jeollabuk-do Agricultural Research and Extension Services) ;
  • Lee, Sang-Koo (Crop Protection Division, National Academy of Agricultural Science) ;
  • Lim, Ju-Rak (Jeollabuk-do Agricultural Research and Extension Services) ;
  • Lee, Jang-Ho (Jeollabuk-do Agricultural Research and Extension Services) ;
  • Cheong, Seong-Soo (Jeollabuk-do Agricultural Research and Extension Services) ;
  • Lee, Sang-Guei (Crop Protection Division, National Academy of Agricultural Science)
  • Received : 2014.09.03
  • Accepted : 2014.09.26
  • Published : 2014.09.30
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Abstract

This study was carried out to determine the economic injury level and economic threshold level on beet (Beta vulgaris L.) infested with Spoladea recurvalis in the plastic greenhouse condition in 2010. The second instar larvae of S. recurvalis were inoculated with 7 different density levels on the each 10 beet plants as a replication. Injury levels of beet leaves and density of S. recurvalis were increased with the inoculation density of S. recurvalis. However, yield and marketable commodity of beet were decreased. Linear relationship between the percent yield reduction (Y) of beet leaves and different infestation densities of S. recurvalis (X) was estimated by the following equation Y = 1.226x + 3.36. Based on the relationships between the densities of S. recurvalis larvae and yield index of beet leaves, the number of second instar larvae which caused 5% loss of yield, economic threshold level was estimated as 1.1 larvae/10 plants for the planting 10 days. The percent yield reduction (Y) of beet roots infested with different densities of S. recurvalis (X) estimated by the following equation Y = 1.537x + 1.4634 after inoculation for 10 days at 3rd harvesting of leaves. Based on the relationships between the densities of S. recurvalis larvae and yield index of beet roots, the number of second instar larvae which caused 5% loss of yield, economic threshold level was estimated as 6.4 larvae/10 plants for the planting 10 days.

비트에서 흰띠명나방의 경제적 피해수준과 경제적 피해허용수준을 설정하하기 위한 연구를 수행하였다. 2010년도 8월 하순에 비트를 정식하였으며 흰띠명나방 2령 애벌레 밀도를 달리하여 접종한 후 생육시기별로 피해엽률을 조사하였다. 10주를 한 반복으로하여 각 처리구당 3반복으로 실험하였다. 비트에서 흰띠명나방의 피해엽률은 접종마리수가 증가함에 따라 피해엽률도 증가하였으나 10월 초순경에 감소하다가 하순경에 다시 증가하였다. 흰띠명나방 애벌레밀도는 초기 접종밀도가 높을수록 증가하였고, 9월 중순부터 감소하다가 10월 중순에 다시 증가하였다. 흰띠명나방 접종밀도가 증가할수록 비트 잎의 수확량과 상품률이 감소하였으며 이에 따라 수량감소율은 증가하였다. 흰띠명나방 유충을 접종한 후 3회에 걸쳐 잎을 수확하여 얻은 접종밀도(x)와 수량감소율(y1)과의 관계식은 y1 = 1.226x + 3.36이였으며 최종적으로 수학한 뿌리의 수량감소율(y2)과의 관계식은 y2 = 0.478x + 1.15이었다. 따라서 잎의 경제적 피해수준은 10주당 1.3마리, 경제적 피해허용은 1.1마리였으며, 뿌리의 경제적 피해수준은 10주당 8.1마리, 경제적 피해허용수준은 6.4마리로 설정되었다.

Keywords

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