Postembryonic Development and Life Table Parameters of Typhlodromus pyri Scheuten, Cydnodromus californicus (McGregor) (Acarina: Phytoseiidae) and Brevipalpus chilensis Baker (Acarina: Tenuipalpidae)
Life table parameters and the effect of feeding predator mites Typhlodromus pyri Scheuten and Cydnodromus californicus (McGregor) with different development stages of phytophagous mite Brevipalpus chilensis Baker was studied at laboratory conditions of 25 ± 2ºC, 60 ± 5% RH and 16:8 h (L:D). Life table parameters including net reproductive rate (Ro), finite rate of increase (λ), intrinsic rate of increase (r m) and mean generation time (T) of T. pyri, C. californicus, and B. chilensis were studied. Postembryonic development and oviposition rate of T. pyri and C. californicus were evaluated on response to food diet that included eggs, immature and adult stages of B. chilensis It was possible to determine the influence that each food type had on the oviposition rate of T. pyri and C. californicus by evaluating the amount of eggs laid. The effect of each food type on the post embryonic development was evaluated by measurements of developmental time. Mated females of T. pyri had a higher net reproductive rate and intrinsic rate of increase than C. californicus. T. pyri and C. californicus larvae reached adult stage only when fed with eggs or motile immature stages of B. chilensis. Mated females of T. pyri consumed on average 15.7 eggs and 19.38 immature motile stages. Mated females of C. californicus consumed on average 28.53 eggs and 18.5 immature motile stages. The potential use of T. pyri and C. californicus to regulate populations of B. chilensis is discussed.
Instituto de Investigaciones Agropecuarias, INIA
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