Akademik Veri Yönetim Sistemi
BULLETIN OF INSECTOLOGY, cilt.74, sa.2, ss.285-290, 2021 (SCI-Expanded)
Pear psylla, Cacopsylla pyri (L.) (Hemiptera Psyllidae), is the most destructive insect pest of pears in Turkey. In recent years, pear psylla control programs, based largely on the use of synthetic pesticides, have failed due to development of resistance to many synthetic insecticides in psylla populations. As an alternative control tactic, use of oviposition deterrents, which deter insects from laying eggs, is important in the management of insect pests. Based on this concept, four oily substances (palm oil, liquid grease, liquid Vaseline and liquid paraffin) were evaluated for their oviposition deterrent activity against winterform females of C. pyri under field conditions in 2018 and 2019. Only one application was made each year, and all the substances were used at three different concentrations (1, 1.5 and 2 L/100 L water), including 0.01% Tween 20 for a good mixture. Control plots were sprayed with tap water + Tween 20 (0.01%). Applications in both years were made at the dormant period (just before the first eggs were deposited by winterform females). Oviposition deterrence of the substances was evaluated by weekly counts of eggs deposited by winterform females of C. pyri on treated dormant shoots throughout one month after application. The results showed that no oviposition was observed in the plots treated with liquid grease and liquid paraffin, indicating that these substances exhibited 100% oviposition deterrent activity at all the concentrations during the study period in both years. Palm oil had a lower level of deterrence than the other substances tested. In the control plots, first eggs were seen 3 days post application in both years. Results suggest that liquid grease and liquid paraffin were highly promising as oviposition deterrents and had the potential for early suppression of pear psylla populations.