Korean journal of applied entomology (한국응용곤충학회지)

Korean Society of Applied Entomology (한국응용곤충학회)
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Effects of Ground Vegetation and Pyrethroid Spray on the Population Dynamics of Panonychus citri (Acari: Tetranychidae) and Natural Enemies in Citrus Orchard: A Short-term Effect

감귤원에서 초생관리와 합성피레스로이드계 조합처리가 귤응애와 천적의 발생양상에 미치는 단기효과

  • Hyun, Seung Young (Major of Plant Resources Science and Environment, College of Agriculture & Life Sciences, SARI) ;
  • Kim, Dong-Soon (The Research Institute for Subtropical Agriculture and Biotechnology, Jeju National University)
  • 현승용 (제주대학교 생명자원과학대학) ;
  • 김동순 (제주대학교 아열대생명과학연구소)
  • Received : 2021.12.28
  • Accepted : 2022.02.16
  • Published : 2022.03.01
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Abstract

This study was conducted to examine the effects of grass vegetation (W: manual weeding, NW: herbicide sprays) and pyrethroid spray (P: pyrethroid spray, NP: no pyrethroid spray) on the population dynamics of Panonychus citri and natural enemies in citrus orchards. Two essential hypothesis were made to test the population dynamics: 1) weed planting promotes natural enemies by offering habitat and alternative food sources, resulting in the reduction of P. citri populations, and 2) pyrethroid spray removes natural enemies by its non-selective toxicity, resulting in the increasement of P. citri populations. The observed natural enemy populations (mainly Phytoseiids and Agistemus sp.) were not different largely from the expected values in the hypothesis, which assumes more abundant natural enemies in weeds and no pyrethroid plots. Although some discrepancy was occurred in NW+NP and W+NP plots in 2011, the observed values were almost same with expected values in 2012. In overall, pesticide effect was strongly significant and pyrthroids removed largely natural enemies. Although habitat (weeds) effect showed a conflict result, natural enemy population increased in plots allowing weed growth, when considering the increased autumn population relatively compared to that of spring-summer population. The decreased abnormal P. citri populations in pyrethroid plots could be explained under the assumption of a strong repellent behavior of P. citri to the pyrethroids.

본 연구에서는 감귤원에서 초생재배 유무(초생재배 W, 제초제 살포 NW)와 합성피레스로이드계 살포유무(살포 P, 무살포 NP)에 따른 귤응애의 개체군 동태를 구명하고자 수행되었다. 두 가지 기본적인 가설로 1) 초생재배는 천적의 서식처를 제공하여 천적의 정착을 높이므로 귤응애의 발생을 감소시키는 요인으로 작용하며, 2) 합성피레스로이드계는 천적을 제거하여 귤응애의 밀도를 증가시키는 요인으로 가정하였다. 관측된 천적 개체군(주로 이리응애류와 마름응애류)의 발생은 가정에 근거한 기대치와 크게 다르지 않았다. 2011년의 경우 NW+NP 처리구와 W+NP 처리구에서 차이가 있었으나, 2012년 실험에서는 기대치와 관측치가 거의 일치하였다. 전체적으로 약제효과가 뚜렷하게 나타나서 합성피레스로이드계 살포시 천적이 유의하게 감소하였다. 잡초효과는 엇갈리는 결과를 보였는데, 봄-유래 여름 개체군 대비 가을 개체군의 증가 등을 고려할 때 초생재배를 하는 경우 천적의 발생이 증가하였다. 다만, 합성피레스로이드계 살포구에서 귤응애가 감소하는 비이상적인 결과는 귤응애의 합성피레스로이드계에 대한 강한 기피성을 전제로 해석할 수 있었다.

Keywords

Acknowledgement

부경생 교수님께서는 제주가 고향이기도 하지만 제주에 특별한 애착을 갖고 계셨고, 퇴임후에는 제주에 머무시면서 무화과와 블루베리를 재배하며 한때를 보내기도 하셨습니다. 선생님께서는 평생 성페로몬 연구를 중심으로 한 곤충생리 연구에 집중하셨고, 연구생활의 후기에는 과수 IPM에 전념하시면서 현장에서 (고)이순원 박사와 함께 우리나라 사과 IPM의 기틀을 놓으셨습니다. 이 추모논문은 선생님의 곤충학과 IPM에 대한 헌신에 보답하고자 작성되었습니다.

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