Scale control over Grapholitha molesta Busck with mating disruption clip combined with chemical control in late-ripening pear orchard

Abstract：【Objective】The aim of this study is to illuminate the occurrence dynamics of Grapholitha molesta Busck (oriental fruit moth) and explore the control effect of new sexual pheromone releaser—mating disruption clip on the oriental fruit moths in late-ripening pear orchard.【Methods】The occurrence dynamics of adult oriental fruit moths in all the growing season was determined based on the number of adult moths trapped using sex pheromone.According to the occurrence dynamics, the control effect of mating disruption clip was investigated by releasing the sexual pheromone (with the three active ingredient of 330 clips·ha-1, 495 clips·ha-1 and 660 clips·ha-1) combined with the utilization of conventional pesticide (35% Rynaxypyr water dispersible granules) .【Results】The results showed that the adults of the oriental fruit moths in 2017 emerged from mid or late March in Tai'an, and ended in early October.There were five obvious occurrence peaks, which were concentrated from July to September.During the adult emergencing generations of 1-4, the mating disruption rate of oriental fruit moth for mating disruption clips of two active ingredients (495 clips·ha-1 and 660 clips·ha-1) combined with the utilization of conventional pesticide (35% Rynaxypyr water dispersible granules) was from 96.89% to 100%, which were obviously more than that of 330 clips·ha-1 (70.60% to 90.78%) (α = 0.05) .In addition, the control effect of mating disruption clip (495 clips· ha-1 and 660 clips·ha-1) for the oriental fruit moth larve on injury fruits were 88.36%～93.78%, also obviously higher than that of 330 clips·ha-1, chemical control (35% Rynaxypyr water dispersible granules) and blank control, with significant difference among them (α = 0.05) .The results of this study exhibited that the mating disruption clip combined with the application of chemical pesticides had an excellent control effect on oriental fruit moths【Conclusion】The results of this research will provide reference to the occurrence regularity and damage symptoms of the oriental fruit moths in late-ripening pear orchards, clarify the optimal dosage of oriental fruit moth mating disruption clip, and provide theoretical basis and data support for environment friendly control of the oriental fruit moths.