Effect of temperature and humidity on the development, longevity and predatory potential of Pharoscymnus flexibilis Muls. on San Jose scale.
The influence of temperature (22, 24, 28, 32 and 37°C) and RH (45, 65 and 85%) on the development, survival, fecundity and predatory potential of Pharoscymnus flexibilis was observed. The optimum temperature and humidity for the development of different stages of P. flexibilis and predatory potential were observed to be 28°C and 65% RH, resp. The coccinellids hibernated at 22°C and could survive for more than 175 days, while at 37°C, they died within 5-10 days. P. flexibilis was observed to consume, on average, 1362, 2537 and 2110 crawlers of Quadraspidiotus perniciosus at 24, 28 and 32°C, resp., throughout its larval and adult lifespan.