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Reproductive success of Psoroptes ovis (Acari: Psoroptidae) on Hereford calves with a previous infestation of psoroptic mites.

Hereford calves with no previous exposure to Psoroptes ovis (Hering) (naive) developed mange with significantly greater numbers of mites at 3, 6, and 7 wk after exposure to mites than did calves that had been previously infested (PI) with P. ovis . Seven weeks after exposure there were 3-fold more mites in skin scrapings of naive calves than in scrapings of PI calves. Egg production by female P. ovis on naive calves was significantly greater than that by females on PI calves. The observed reduction in fecundity apparently was attributable to a lower rate of oviposition by females on PI calves rather than to inhibition of egg development.