Selectividad del parasitoide Trichopoda giacomellii (Blanchard) (Diptera: Tachinidae) hacia individuos de Nezara viridula (L) (Hemiptera: Pentatomidae) que difieren en el estado de desarrollo, sexo, edad y patrones de coloracion
Abstract
T. giacomellii ís an almost specific parasitoid of lite green stink bug N. viridula and one of its most important mortality factors. It attacks the two older instar nymphs and the adults by sticking eggs on to the body. This study was conducted to evaluate both, the profitability of different host types, and the parasitoid’s selectivity for different host types. Dissection of parasitized hosts collected in the field, allowed the estimation of the profitability of different host types (number of living pupae obtained per host and per parasitoid generation time). The scale of profitability was from lower to higher. 4th instar nymphs - 5th instar nymphs - adults. The higher probability of losing parasitoid’s eggs during the ecdisis, would account for the increasing profitability of succesive developmental stages. With respect of the adult stage, male profitability is higher if each host has been attacked only once, presumably due to the more effective immunological system of female hosts. On the other hand, if the hosts were attacked several times (more than 4 eggs) female profitability was higher, presumably due to its bigger size. Finally, considering adult hosts with a number of eggs varying from 1 to 23, no significant difference was detected in their profitability. Results obtained from experiments using caged, or marked and recaptured host individuals, as well as from succesive field samplings, allowed the estimations of parasitoid ́s preference. Results suggested a parasitoid’s selectivity according to tine host’s developmental stage and sex of tine adults. No selectivity was observed for hosts with different colour patterns, age of adult or nymphal sex. The resulting scale of preference (somewhat similar to the scale of profitability) was from lower to higher: 4th and 5th instar nymphs - adult females - adult males.
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