Comparative of mortality pre imaginal developmental time of Bryobia rubrioculus Scheuten (Acari:Tetranychidae) in different temperatures on cherry

Abstract : The brown mite Bryobia rubrioculus Scheuten is spreaded around the world. This mite activates on orchards in Iran at differents areas like Hamedan proveince. It is an important aspect of damage economic,so the study of biology was conducted in the lab conditions at 9 constant temperatures(15,17.5,20,22.5,25,27.5,30,32.5,35),(±0.5)ºC, Rh%(60±5) and L:D 16:8 , on cherry leaf discs. The out puts showed that the lowest mortality of pre-imaginal developmental time was at 15 ºC (52%) and highest at 32.5 ºC (85%). In this study, the mortality had an increasing with increasing of temperature,but at 35 ºC no eggs hatched. These results showed that mortality is dependent to enviromentals factors specially to temperature. Hence, the data can be used in life table of brown mite.

Key words: Brown mite Bryobia rubrioculus, Mortality, Hamedan,Cherry.