Aphidivorous Activity of a Coccinellid Beetle, Harmonia axyridis Pallas(Coleoptera: Coccinellidae)

포식성천적(捕食性天敵) 무당벌레의 진딧물 포식능력(捕食能力)

  • Choi, Seung-Yoon (Division of Applied Entomology College of Agriculture, Seoul National University) ;
  • Kim, Gil-Hah (Division of Applied Entomology College of Agriculture, Seoul National University)
  • 최승윤 (서울대학교 농과대학 농생물학과) ;
  • 김길하 (서울대학교 농과대학 농생물학과)
  • Published : 1985.04.30

Abstract

Some experiments were conducted to evaluate the aphidivorous activity of coccinellid beetle, Harmania axyridis Pallas. Experiments were carried out using with laboratory reared beetles and two aphid species(Aphis gossypii and Myzus persicae). Factors referred in the study of aphidivorous activity were the age of beetle, aphid species, temperatreu and illumination time. The aphidivorous activity was greatly different in relation to aphid species, developmental stages of the beetle, and the temperature. The 3rd and 4th instar larvae consumed more aphids than the 1st and 2nd instar larvae. Though the beetles consumed more number of cotton aphid, total weight of aphids consumed the more or less the same. Aphidivorous activity of the 1st to 4th instar larvae increased with a rise in temperature and adult activity was relativel high at $20^{\circ}C$ and low at $15^{\circ}C\;and\;30^{\circ}C$. The aphidivorous activity of the beetles was not influenced by the illumination period under the conditions given in this experiments, however, seem to require further study.

Keywords