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The predatory bug Anthocoris nemoralis is one of the most important predators of the pear psyllid Cacopsylla pyri in Bulgaria. In untreated pear orchard in the region of Plovdiv its population density increases in June-July, following the population denisty of C. pyri. In August the population density of the pear psylla was reduced and during that period a strong negative correlation between the population density of the eggs and nymphs of C. pyri and the larvae and adults of A. nemoralis was observed. There is a good functional reaction of A. nemomlis to the population density of C. pyri.
Under laboratory conditions at 24 and 28°C respectively the egg stage took 5 and 3 days. There was a difference in the development time of male and female nymphs, the male nymph taking less time to reach adult stage – l5 and 17 days at 24°C (male and female respectively), and 11 and 12 – at 28°C. The total development time from egg to adult is 20 and 22 days at 24°C and 14 and 15 days at 28°C. The pre-ovoposition period is averagely 2 days. A female laid an average of 53 eggs. The adult has a greater consumption abilities compared to that of the nymph from 5th instar. The average daily consumption of eggs of the psyllid was 176±11, l4±7 young nymphs and 50±6 adult nymphs of the psyllid.