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Chinese Journal of Biological Control ›› 2021, Vol. 37 ›› Issue (6): 1338-1343.DOI: 10.16409/j.cnki.2095-039x.2021.11.013

• SCIENTIFIC NOTES • Previous Articles    

Predatory Functional Response of Different Stages of Harmonia axyridis Pallas on Panaphis juglandis Goeze

TAI Jinrui1, LIU Siqi2, GAO Guizhen1   

  1. 1. College of Forestry and Horticulture, Xinjiang Agricultural University, Urumqi 830052, China;
    2. Forestry and Grassland Bureau of Huili County, Huili 615100, China
  • Received:2020-12-04 Published:2021-12-15

Abstract: Panaphis juglandis Goeze is a recently reported pest of walnut trees. The biological control potential of Harmonia axyridis Pallas on P. juglandis was assessed by examining the functional response of H. axyridis to various densities of P. juglandis under laboratory conditions. The results showed that the functional response of the 1st to 4th instar nymphs and adults of H. axyridis to P. juglandis fitted well with the Holling-II model. The daily maximum theoretical predation of the nymphs and adults of H. axyridis on P. juglandis in descending order were 4th instar nymph, female adult, male adult, 3rd instar nymph, 2nd instar nymph, and 1st instar nymph. The searching efficiency of H. axyridis decreased with the increase of prey density. The 4th instar nymphs of H. axyridis showed the highest attacking efficiency, the shortest handling time, and the highest searching efficiency on P. juglandis. These results show that H. axyridis is an effective predator against the large walnut aphid.

Key words: Harmonia axyridis, Panaphis juglandis, functional response, biological control

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