Control of the pear psyllid, Cacopsylla pyricola, in South East England by predators and pesticides

  • Published source details Solomon M.G., Cranham J.E., Easterbrook M.A. & Fitzgerald J.D. (1989) Control of the pear psyllid, Cacopsylla pyricola, in South East England by predators and pesticides. Crop Protection, 8, 197-205.


This study is summarised as evidence for the following.

Action Category

Alter the timing of insecticide use

Action Link
Natural Pest Control
  1. Alter the timing of insecticide use

    A controlled study in 1978 in pear Pyrus sp. orchards in Kent, UK (Solomon et al. 1989) found plots sprayed with permethrin in March had 2.9 flower bug (Anthocoridae) adults/beat, plots sprayed in July had 0.5 adults and plots sprayed in both months had 0.4 adults, when these natural predators were measured in August. Spraying in March reduced flower bug numbers from 0.05-0.10 adults/beat before spraying to 0.0 adults one month afterwards, while spraying in July reduced numbers from 0.8 to 0.5 adults. In late August, plots sprayed only in March had 9 pest pear psyllid Cacopsylla pyricola eggs/10 leaves, plots sprayed only in July had 55 eggs and plots sprayed in both months had 45 eggs. A 2 ha orchard was divided into four treatments receiving permethrin sprays (100 g a.i./ha) in March, July, March and July or no sprays. Predators were sampled by beating branches over a 0.3 m² funnel.

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