Akademik Veri Yönetim Sistemi
International Conference on Science and Technology (ICONST-2018), Prizren, Kosova, 5 - 09 Eylül 2018, ss.48, (Özet Bildiri)
Chlorpyrifos ethyl is widely used in the chemical control program of different harmful insect pests in pear growing areas of Turkey. This insecticide also affects the population of the polyphagous predatory bug namely, Anthocoris nemoralis which is naturally found in pear orchards and particularly feeds on pear psylla, and this action is know as biological control. Biological control is the beneficial action of predators, parasitoids and pathogens in controlling different insect pests and their damges to the yield and quality of fruit and other agricultural crops. The main purpose of this study was to determine the effect of chlorpyrifos ethyl on mortality, egg hatching and prey consumption ratios of this polyphagous beneficial bug. Study has been conducted under laboratory conditions of 25±1o C, 70±10 R.H. and 16:8h (L:D). Different biological stages of the predatory bug, chlorpyrifos ethyl active ingredient insecticide, potter sprayer and fresh eggs of Ephestia kuehniella were used as the materials of this research work. Individuals of the predatory bug were fed by offering one third dose of chlorpyrifos ethyl contaminated E. kuehniella eggs in each treatment. The experiments were conducted by using 3 replications. Distilled water has been used in control treatments. Finally, the obtained data were analyzed by applying Tukey Test using the SPSS package program. As a result of this research work, the highest prey consumption (28.89±1.92) was observed in male treatments, while the lowest amount of E. kuehniella eggs (17.78±5.09) have been consumed by the 3rd nymphal stages of A. nemoralis within a time span of 24 h. As far as the egg hatching treatments are concerned, 36.67±0.03 eggs have been hatched after 120 hours of the conduction of experiments, but no egg hatching has been recorded within first 48 hours. The eggs started to hatch after 72 h of the conduction of experiment which was noted as 00.17±0.07. The highest mortality rate (67.77±4.04) has been recorded in 3rd nymphal instars followed by the female individuals of the true bug as 47.22±5.20, while the lowest mortality rate (42.22±5.48) was recorded in male individuals followed by the 5th nymphal stages of the polyphagous bug as 46.11±5.36. The application of chlorpyrifos ethyl active ingredient insecticide affected significantly the rate of egg hatching, mortality ratio of the 3rd nymphal instar and female individuals, and also the ratio of prey consumption of the 3rd immature stage of A. nemoralis.