Artículos de revistas
MICROCHAROPS-ANTICARSIAE (HYM, ICHNEUMONIDAE), PARASITOID OF ANTICARSIA-GEMMATALIS (LEP, NOCTUIDAE) - HOST AGE PREFERENCE, SEX-RATIO EFFECTS AND FUNCTIONAL-RESPONSE
Entomophaga. Lavoisier Abonnements, v. 38, n. 4, n. 511, n. 517, 1993.
The endoparasite, Microcharops anticarsiae Gupta, is one of the natural control agents of Anticarsia gemmatalis Hubner. The effects of host age on the levels of parasitisation and the sex ratio of the subsequent progeny, together with the functional response of M. anticarsiae at 6 different host densities, were evaluated experimentally. In choice experiments involving two or four consecutive instars, female parasitoids showed no preference for host larvae of a particular age. The sex ratio of the parasitoids was affected by the host instar in which they developed (G3df = 18.21, p < .001). Parasitoid sex ratio was most skewed towards females in parasitoid larvae that developed in 4th instar hosts. A type II functional response was exhibited by the female parasitoid in response to host density. Information on the sex ratio, indicated the best host instar to parasitize to produce an optimum female: male sex ratio, while the functional response indicated the average rate (38.0 +/- 7.5) of parasitism per female. This information is important for mass-rearing of M. anticarsiae, for biological control programs against A. gemmatalis.384511517