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Acta Horticulturae Sinica ›› 2025, Vol. 52 ›› Issue (1): 13-24.doi: 10.16420/j.issn.0513-353x.2024-0139

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Effects of Four Pear Species and Their Biological Characteristics on the Oviposition of Pear Psylla

GAO Xin1, ZHAO Longlong2,*(), YU Qiang1, JI Jiayue2, WEI Jie1, LU Haoyue1, WEI Mingfeng3, MA Ruiyan1   

  1. 1 College of plant protection,Shanxi Agricultural University,Jinzhong,Shanxi 030801,China
    2 Pomology Institute,Shanxi Agricultural University,Jinzhong,Shanxi 030815,China
    3 Cotton Research Institute,Shanxi Agricultural University,Yuncheng,Shanxi 044000,China
  • Received:2024-10-17 Revised:2024-11-25 Online:2025-01-25 Published:2025-01-18
  • Contact: ZHAO Longlong

Abstract:

In this study,a total of 71 pear varieties of Pyrus bretschneideriP. pyrifoliaP. ussuriensis and P. communis were selected to study the relationship between pear tree phenological periods,cultivars,the number of bud scale scars,the leaf margin serration and egg-laying amount of pear psylla(Cacopsylla chinensis). The results indicated that the average egg-laying amount of winter form pear psylla in leaf expansion period was significantly higher than that in sprouting and flowering periods. There was no significant difference in egg-laying amount among different cultivars during the sprouting and flowering period. But in the leaf expansion period,the egg-laying amount on P. pyrifolia and P. bretschneideri was significantly higher than that on P. ussuriensis and P. communis. Except for P. communis,the number of bud scale scars of the other 3 species was positively correlated with the egg-laying amount of winter form pear psylla. The summer form pear psylla mainly oviposited on P. bretschneideri and P. pyrifolia,and their egg-laying amounts were significantly higher than that on P. ussuriensis and P. communis. The summer form pear psylla prefer to oviposited on the serration and surface of leaves,and it laid the least amount of eggs in the petiole. The egg-laying amount of summer form pear psylla was a significant correlated with the angle of leaf margin serration. And the egg-laying amount was largest when the serration angle was 20°-40° and 101°-120°. While the density of serration and leaf glossiness had relatively little effects on the egg-laying amount of pear psylla. It demonstrated that,some biological characteristics of pear trees obviously affected the oviposition of pear psylla. In the growing period of pear trees,different species of pear trees and the angle of leaf margin serration both had obvious effects on oviposition of summer form pear psylla. For winter form pear psylla,the pear species had relatively little effect on its oviposition and the number of bud scale scars was the key factors affecting its oviposition.

Key words: pear, leaf, biological characteristics, Cacopsylla chinensis, ovipositon preference