Pesquisa Agropecuária Brasileira (1999) 34, 891-896

Dirceu Pratissoli and Harley Nonato de Oliveira (1999)
Influência da idade dos ovos de Helicoverpa zea (Boddie) no parasitismo de Trichogramma pretiosum Riley
[Influence of egg age of Helicoverpa zea (Boddie) on the parasitism by Trichogramma pretiosum Riley]
Pesquisa Agropecuária Brasileira 34 (5), 891-896
Abstract: Among the agents of biological control, the parasitoids of the genus Trichogramma represent one of the most important groups, as they are able to control many pests in agriculture. The objective of this work was to determine the best age of the Helicoverpa zea (Boddie) eggs so that the Trichogramma pretiosum Riley could have the best efficiency against this pest. One, two, three and four-days-old eggs were offered for the parasitism during 24 hours, at 25 ± 1ºC, relative humidity 70 ± 10% and photofase of 14 hours. One-day-old eggs showed the highest rates of parasitism, viability, and number of descendants for each female. The highest efficiency with T. pretiosum will be reached in the field conditions, when observed a great density of H. zea eggs until two days of embryonic development.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
(original language: Portuguese)
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Database assignments for author(s): Dirceu Pratissoli

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
general biology - morphology - evolution

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Helicoverpa zea
Trichogramma pretiosum (parasitoid)	Helicoverpa zea