Abstract
The life history parameters concerned with population growth were studied in the citrus red mite, Panonychus citri (MCGREGOR), among genotypes, or the hexythiazox resistant Haibara-R (RR), the susceptible Haibara-S (SS) and their hybrids (SR and RS) which are the same origin from a citrus orchard at Haibara-cho in Shizuoka Prefecture, Japan. The difference in the intrinsic rate of natural increase (v m ) among genotypes was slight at 25°C where v m decreased in the order genotype SS (0.2110), SR (0.2098), RS (0.2042), RR (0.1996). However, the fitness disadvantage was severe at 35°C where v m were 0.1187 and 0.0123 in SS and RR, respectively. At any mite age at 25 and 35°C, reproductive values (V x /V 0 ) in RR were smaller than those in SS. The reduction of values of v m and V x /V 0 at both 25 and 35°C seemed to be ascribed to the significantly shortened longevity and reduced fecundity of adult females in RR, compared with those in SS.
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