Influence of egg age of Helicoverpa zea (Boddie) on the parasitism by Trichogramma pretiosum Riley

Among the agents of biological control, the parasitoids of the genus Tricho gramma represent one of the most important groups, as they are able to cont rol many pests in agriculture. The objective of this work was to determine the best age of the Helicoverpa tea (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 hou rs, at 25 +/- 1 degrees C, 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 de nsity of H. zea eggs until two days of embryonic development.