Scarlet mite, Brevipalpus obovatus is one of the important and cosmopolitan species of pests, active on many crops, fruit and ornamental plants. This mite was recorded for the first time on tea in 1961 from northern regions of Iran and recently reported from other parts of the country. The mite is able to make damage to all varieties of tea. In this research, biology of B. obovatus was studied under laboratory conditions at three different temperatures of: 20.5±2 ?C, 25.5±2?C, 29.5±1?C; 80±5% RH, and 12 hrs of photoperiodism in incubator, and with leaf disc method. The effect of temperature on different growth period of mite including: larval period, nymphochrysalis, protonymph, deutochrysalis, deutonymph, teliochrysalis, preovipsition period, oviposition, end of oviposition, egg number as well as death time was studied. Average number of eggs deposited by the female was directly correlated with longevity of mites. Maximum number of eggs was 82 and the longest life span 107.5 days at 20.5±2?C. The average life cycle of one generation (egg to egg) at 20.5±2?C, 25.5±2?C and 29.5±1?C was completed within 39.8, 28.9 and 24.2 days, respectively.
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