Relative humidity on the one hand directly affects the development of adult flies and cockroaches. On the other hand, the development of larvae is indirectly affected by the evaporation of feed moisture in the larval culture medium. Air relative humidity had a significant effect on the emergence rate of cockroaches, female oviposition and life of male adults. The best theoretical values â€‹â€‹for the former two were 75% RH and the latter was 65% RH. Generally, the air relative humidity is 50^-80%.
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