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Abstract


Effect of Entomopathogenic Beauveria bassiana Isolates on Rosy Leaf Curling Aphids (Dysaphis devecta Walk.) (Hemiptera: Aphididae)
There are many pests that cause significant loss of apple yield. The aphids are among the major pests of the apple orchards. Dysaphis devecta Walk. (Hemiptera: Aphididae), rosy leaf curling aphid, an important pest species in apple. Insecticide is used extensively in the control of them and they gain resistance in a short time against insecticides. Alternative methods to insecticides in management of D. devecta is entomopathogenic fungi. The aim of the present study was to determine the effect of entomopathogenic fungus Beauveria bassiana Balls. (Vull.) isolates on rosy leaf curling aphid. In this study, 12 B. bassiana isolates were applied at 1x108spores/ml concentration by sprey method and left to incubate for three days at 25±2°C temperature, %65±5 humidity and16:8 Light:Dark conditions. On the first day, the isolate GOPT-297 caused highest mortality with 81% mortality rate. This was followed by isolate GOPT-64 with 41% mortality. As the duration of incubation increased, the mortality rates increased. At the end of two days of incubation, GOPT-297 isolate resulted in 100% mortality, followed by isolates GOPT-114 and GOPT-282 with 79% and 75%, respectively. At the end of the three-day incubation period, the mortality rate of all isolates except for GOPT-332 were statistically significantly higher than control. At the end of the three-day incubation period, GOPT-297 isolate had 100% mortality followed by GOPT-282 with 92% and GOPT-284 with 89.5%. The percentage of mycosis caused by the isolates ranged from 6.2% to 46.58%. In conclusion, it can be said that the entomopathogenic fungi has the potential to be used in the rosy leaf curling aphid control.

Keywords
Dysaphis devecta, afit, entomopatojen, fungi, Beauveria bassiana


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