The biology of Encarsia tricolor an autoparasitoid of whitefly
Encarsia tricolor Förster (Hym.: Aphelinidae) is an autoparasitoid of a number of whitefly pest species. Females develop as primary endoparasitoids, whereas males develop hyperparasitically in other whitefly endoparasitoids including conspecific females. Under a constant regime of 25°C and 16:8 h L:D, the biology of E. tricolor was investigated using the Cabbage whitefly, Aleyrodes proletella, as host. The following results were obtained. (1) A significant positive linear correlation was detected between size and longevity for both sexes, given a honey diet. Mean (±SE) longevity was 16.9 ± 0.62 days for females and 13.8 ± 0.66 days for males. Females were significantly larger than males. (2) Female E. tricolor could develop in all host instars. Development times were slowest in first instar nymphs (22.3 ± 0.34 days) and fastest in fourth instar nymphs (18.7 ± 0.25 days). Female development times were not overtly variable. (3) Male E. tricolor could hyperparasitize all stages of conspecific female larvae and pupae offered.
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| Format: | Texto biblioteca |
| Language: | eng |
| Subjects: | Aleyrodes proletella, Encarsia tricolor, Parasitoides, Control biológico de plagas, |
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