author(s)
İnanç Özgen and Yunus Güral

abstract
The cherry fly Rhagoletis cerasi L. (Diptera: Tephritidae) is a pest that causes yield losses and reduces the market value of the fruit. It is the key pest of cherry orchards both in Turkey and in other countries. Since the pest causes damage directly on cherry fruits, its economic loss is great. It is known that pest adults emerge at the end of the flowering period or before the mole fall period in nature, their populations increase during the mole fall period, and reach the highest population density in the pre-ripening or ripening period. In technical instructions, one of the most commonly used methods in the fight against cherry fly is the phenological and pomological prediction method. This method belongs to short-term forecasting. This method, which is based on determining the moment when the insect starts laying eggs, is important in terms of determining the exact timing of the pest control. Namely; the period when the cherry fly starts to lay eggs is specified as the cherry mole fall period, and spraying according to pomology is important in terms of revealing its history. In this study, Malathion 650 g/l, Cypermethrin 250 g/I, Azadiractin 10 g/I insecticides were used in 5 different coloring periods of cherry to determine the effects of the control on the wormy fruit rates. Chi-square test was performed to determine the statistical differences of three different insecticide applications according to different coloring periods of cherry plants. As a result of the study, it was determined that the most successful applications of all insecticides in the 2nd period phenological coloration of cherry were the most successful applications and the lowest values in the number of wormy fruits were observed in this fruit colouration. As a result of the Chi-square test of Malathion application according to the periods, the calculated Chi-square value was calculated as =31.184. The relationship between the periods was found statistically significant (p<0.01). According to this analysis, it was observed that the number of worms decreased from the 1st to the 2nd period, while the number of worms increased statistically from the 2nd to the 5th period. As a result of the Chi-square test performed according to the periods of Cypermethrin application, the calculated Chi-square value was calculated as =24.772. The relationship between the periods was found to be statistically significant (p<0.01). According to this analysis, it was observed that the number of worms decreased from period 1 to period 2, and the number of worms increased statistically from period 2 to period 5. As a result of the Chi-square test performed according to the periods of azadiractin application, the calculated Chi-square value was calculated as =25. 964. The relationship between the periods was statistically significant (p<0.01). According to this analysis, it was observed that the number of worms decreased from period 1 to period 2, while the number of worms increased statistically from period 2 to period 5. The results of this study are important for determining the effect of fruit coloration cycles in the control of cherry fly and contain basic data for cherry IPM studies.