Virulence of Entomopathogenic Nematodes against Neotropical Brown Stink Bug (Euschistus heros [Fabricius], Hemiptera, Pentatomidae) and Compatibility with Phytosanitary Products under Laboratory Conditions

Document Type : Original Research

Authors
J. V. O. Borges
V. Andaló
L. E. Temporim
L. P. M. Arriero
L. M. R. Lima
L. S. D. Faria
Agrarian Sciences Institute, Federal University of Uberlândia, Monte Carmelo, MG, Brazil.
10.22034/jast.25.5.1209
Abstract
The Neotropical brown stink bug, Euschistus heros (Fabricius), is considered a pest in soybean that is difficult to control and leads to deterioration of grains and reduced production. Entomopathogenic nematodes can be used to control insect pests and can also be a complementary tool in the management of the Neotropical brown stink bug. They also exhibit significant compatibility with chemical phytosanitary products. Thus, this study aimed to determine the virulence, production, and concentration of entomopathogenic nematodes in the Neotropical brown stink bug, as well as their compatibility with chemical phytosanitary products. Six nematode isolates, administered in the concentration of 100 Infective Juveniles (IJs) adult-1, were evaluated. Subsequently, Heterorhabditis amazonensis MC01 was evaluated at concentrations of 50, 100, 150, 200, and 250 IJs adult-1. The evaluations were carried out by determining Neotropical brown stink bug mortality and the production of IJs. The compatibility tests consisted of evaluating the viability and infectivity of two nematode isolates incubated in contact with 11 phytosanitary products for 48 hours. The virulence test showed up to 48% Neotropical brown stink bug mortality after 7 days. A greater concentration of IJs was produced for H. amazonensis MC01, compared to Steinernema feltiae, reaching 101,000 and 97,800 IJs adult-1, respectively. The application of 150 IJs adult-1 was associated with the highest mortality of E. heros and the highest production of IJs. Methomyl and profenofos were incompatible with both tested nematodes and chlorpyrifos was incompatible with H. amazonensis MC01. The compatibility of the chemical products with nematodes highlights the possibility of application in association with entomopathogenic nematodes to control E. heros. Products considered incompatible should be avoided, and further tests should be performed to confirm the results in field conditions.

Keywords

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Journal of Agricultural Science and Technology
Volume 25, Issue 5
September and October 2023
Pages 1209-1220