author(s)
SD Chaudhari, HR Kachhela and HD Zinzuvadiya

abstract
The biology and morphometrics of Steneotarsonemus spinki Smiley on rice variety GR-11 was studied in laboratory condition at 31.1 ± 0.9 ºC and 28.9 ± 0.6 ºC maximum and minimum with 54.8 ± 15.18 per cent and 69.3 ± 11.4 per cent mean morning and evening relative humidity, respectively. The average biology of S. spinki showed that the egg, larval, quiescent and adult (male and female) periods were 1.875 ± 0.559 days, 3.575 ± 0.613 days, 0.556 ± 0.167 days, 3.75 ± 0.425 days and 5.00 ± 0.972 days, respectively. The pre-oviposition period, oviposition period and post-oviposition period were 1 to 2 days, 1.5 to 3 days and 1.5 to 2.5 days, respectively. Total life cycle of S. spinki male occupied 8.95 ± 0.864 days and female required 10.20 ± 0.856 days. Sex ratio of male: female was 1: 1.59.