Abstract
Abstract Observations on the development, survivorship and reproduction of Tetranychus piercei McGregor reared on fresh banana leaves were conducted at 16, 20, 24, 28, 32 and 36°C. The developmental time from egg to adult varied from 7.2 d at 32°C to 33.1 d at 16°C. The developmental threshold temperatures of egg, larva, protonymph, deutonymph, preoviposition and a whole generation were 11.2, 9.8, 11.9, 12.5, 13.3 and 10.7°C, respectively. The effective accumulated temperatures were 72.3, 33.6, 22.2, 27.8, 17.7 and 163.6 day-degrees, respectively. Within the range of 16 to 36°C, the relationships between developmental and survival rates of all immature stages, average number of eggs/female, longevity of adults and temperatures showed parabolic trends. Survival rate was the highest (96.1%) at 32°C; whereas at 36 and 16°C it decreased to 79.1 and 66.4%, respectively. The highest number of eggs (35.8 eggs/female) was recorded at 28°C; and the lowest at 16°C (17.9 eggs/female). Female longevity was the longes...
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