四川农业大学学报 ›› 1992, Vol. 10 ›› Issue (02): 325-330.doi: 10.16036/j.issn.1000-2650.1992.02.020

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苹果苜蓿苔螨种群密度的零频率估计初探

单虹丽, 蔡如希   

  1. 四川农业大学农学系, 雅安 625014
  • 收稿日期:1992-01-08 出版日期:1992-06-30 发布日期:2017-04-22

A PRELIMILARY STUDY ON THE ZERO FREQUENCY ESTIMATION OF THE POPULATION DENSITY OF BRYOBIA PRAETIOSA KOCH

Shan Hongli, Cai Ruxi   

  1. Sichuan Agricultural University, Yaan, Sichuan, China, Zip Code: 625014
  • Received:1992-01-08 Online:1992-06-30 Published:2017-04-22

摘要: 本文用三种不同方法对苹果蓿苜苔螨种群密度进行了零频率估计,并对各种方法的估计精度作了比较,同时计算出对应不同抽样精度的理论抽样数表。结果表明,零频率估计苹果苜蓿苔螨的种群密度在实际调查中是可行的。其中以D. J. Grrard与H. C. Chiang方法的估计精度较高。

关键词: 苹果, 果树害虫, 防治

Abstract: In this paper, three different methods are introduced to estimate the zero frequency of the population density of Bryobia praetiosa Koch. The writers compared their various estimating precisions and then dedicated a list of a theoretical spot check number related to the various spot check precisions. The rasults showed that the zero frequency estimation of the population density of Bryobia praetiosa Koch. was feasible in practice, and that the method of D. J. Gerrarr and H. C. Chiang was more precise.

Key words: APPLE, FRUIT TREE PEST INSECTS, PREVENTIVE IREATMENTS

中图分类号: 

  • S661