Hibernation and Seasonal Occurrence of the Cotton caterpillar, Palpita indica(Lepidoptera: Pyralidae), in Watermelon

수박에서 목화바둑명나방(Palpita indica)의 월동과 발생소장

  • 최동칠 (전북농업기술원 작물연구과) ;
  • 노재종 (전북농업기술원 고창수박시험장) ;
  • 이기권 (전북농업기술원 고창수박시험장) ;
  • 김홍선 (농업과학기술원 농업해충과)
  • Published : 2003.06.01

Abstract

The population density of the Cotton caterpillar, Palpita indica (Saunder) larvae was gradually increased until 10th October and then decreased rapidly after that time at the watermelon culture of rain sheltered house. After 15th October, many larvae went to soil and molted to pupae for the hibernation. Most of pupae were found in pF 2.4 soil moisture condition, but none in pF 1.5 hydro-morphic soil. Most of the pupae were found below 5cm and there was no pupa below 10cm from the soil surface. The sex ratio of the overwintering pupae was 1.09 : 1.00. For the monitoring of the cotton caterpillar adults using sex pheromone compounds, different mixture ratios of each pheromone compound were investigated with (E)-11-hexadecenal and (E, E)-10,12-hexadecadienal. Seven versus three ratio of (I)-11-hexadecenal and (E, E) -10,12-hexadecadienal was more attractive than any other ratio, and then followed by 6 : 4, 8 : 2, 9 : 1, and 5 : 5 mixtures. As a result of monitoring with 7 : 3 mixture of (E)-11-hexadecenal and (E, E)-10,12-hexadecadienal, occurrence peaks of cotton caterpillar adults showed 4 times per year. The first time of adult appearance was late July in 2000 and middle July in 2001 and the highest number was collected on late September.

수박재배 하우스에서 목화바둑명나방은 유충이 10월 10일까지 높은 밀도로 유지하다가 10월 15일부터 급격히 밀도가 낮아지기 시작하고 번데기는 10월 15일 이전에는 수박잎이나 과실이 땅과 접촉하는 부위에 있으나 그 이후부터는 지하부로 이동하여 토양속에서 월동하였다. 월동 번데기는 토양의 습도가 pF 2.4정도인 토양에서 대부분이 발견되었으며, 건조한 토양이나 과습한 토양에서는 거의 발견되지 않았다. 하우스 내 월동번데기의 분포는 수박덩굴의 상위엽이 위치해 있었던 부분의 토양내에서 가장 많은 번데기가 발견되었다. 또한 토양 내 수직분포는 지중 5cm 이하에서 대부분이 발견되었으며, 지하 10cm이상에서는 전혀 발견되지 않았다 전체 월동번데기의 암수 성비는 1.09 : 1.00으로 성간에 큰 차이가 없었다. 목화바둑명나방 발생예찰을 위한 성페로몬은 (E)-11-hexadecenal과 (E, E)-10, 12-hexadecadienal을 7 : 3으로 혼합했을 때 가장 유인량이 많았다. 가장 유인효과가 좋았던 (E)-11-hexadecenal : (E, E)-10, 12-hexadecadienal 7 : 3의 페로몬을 이용한 시기별 발생소장 조사에서는 4회의 발생성기를 보였는데 7월 중하순에 처음으로 유인되었고 9월 하순에 가장 유인량이 많았다.

Keywords

References

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