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Biologia e exigências térmicas de Trichogramma pretiosum Riley (Hymenoptera: Trichogrammatidae) sobre ovos de Bonagota cranaodes (Meyrick) (Lepidoptera: Tortricidae)

DOI: 10.1590/S0103-84782006000500001

Keywords: parasitoid of the eggs, parasitism percentage, biological control, trichogramma, thermal requirement.

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Abstract:

this work was aimed at studyng the biology of trichogramma in laboratory, in search of its use in integrated management programs to control bonagota cranaodes in culture of the apple. the biology of trichogramma bruni nagaraja and of two lineages (l3 and l4) of trichogramma pretiosum on eggs of b. cranaodes was done such their thermal demands and annual number of generations. the line l3 presented more parasitism (52.3%), however, the feseability was similar among the lineages studied; with biological cycle of 8.7 days; the longevity of females was 10.65 days; low threshold temperature of 11.35°c and thermal requirement of 128.70 gd, the number of annual generations this line in laboratory was 47.22 and 13.59 for vacaria-rs climate conditions. the low parasitism of the t. bruni and of the lineage l4 of t. pretiosum can be related to the layer of secretion presented on the laying of the pest. although this parasitism is considered low, the use of these lineages cannot be discarded the integrated apple production, systens. new studies shal be accomplished in field conditions.

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