INFLUENCE OF AMBIENT CONDITIONS ON THE PARASITIZATION OF Anagasta kuehniella EGGS BY Trichogramma pretiosum

Authors

  • Fernando Bellesini Vigna Department of Agricultural, Livestock and Environmental Biotechnology, Laboratory of Biochemistry and Plant Microorganisms, São Paulo State University (UNESP) http://orcid.org/0000-0002-9915-889X
  • Murilo Gaspar Litholdo Department of Agronomy, Moura Lacerda University
  • Elaine dos Santos Guidetti Karlinke Department of Agronomy, Moura Lacerda University
  • Kênia Rezende Silva Department of Agronomy, Moura Lacerda University
  • Alexandre de Sene Pinto Department of Agronomy, Moura Lacerda University

DOI:

https://doi.org/10.28998/rca.22.15615

Keywords:

ecology,, biological control, egg parasitoid, Hymenoptera, parasitoid

Abstract

This study investigated the parasitism rate of Trichogramma pretiosum (Hymenoptera: Trichogrammatidae) on Anagasta kuehniella eggs (Lepidoptera: Pyralidae) in various crops, including maize, crotalaria, and sorghum, while considering diverse weather conditions. Conducted over multiple time points from 2016 to 2018, bioassays were designed with meticulous detail. In each assay, 100 blue cardboard strips (measuring 10 x 0.6 cm, with each strip containing 50 A. kuehniella eggs at the edge) were strategically placed on 20 randomly selected plants within a 5-meter radius from the central point of the field. Egg strips installed at 6:00 am and continued throughout the day, with replacements every two hours until 6:00 pm. Fresh strips were then placed overnight, starting from 6:00 pm until the subsequent morning at 6:00 am. The release of T. pretiosum took place at 6:00 am in the central region of the experimental area.  It was observed that the parasitism rate exhibited its highest values when the relative humidity exceeded 40%. Parasitism peak typically occurred between 12:00 pm and 2:00 pm. Interestingly, parasitism rates were notably lower immediately after the release of parasitoids and during night-time hours. This suggests that T. pretiosum requires a certain time for dispersion and initiation of parasitism, with substantial activity decline during nocturnal periods.

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Published

2024-05-13

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Section

Produção Vegetal