Field-Aged Insecticide Residues on Chrysoperla johnsoni (Neuroptera: Chrysopidae)

Author:

Amarasekare Kaushalya G1,Brown Preston H2,Shearer Peter W3

Affiliation:

1. Department of Agricultural and Environmental Sciences, Tennessee State University, College of Agriculture, Farrell Westbrook Ag. Complex, John A. Merritt Blvd., Nashville, TN

2. Farmers Conservation Alliance, 102 State Street, Hood River, OR

3. Strawberry Center, California Polytechnic State University, San Luis Obispo, CA

Abstract

Abstract We studied the direct (lethal) and indirect (sublethal) effects of field-aged insecticide residues of spinetoram, chlorantraniliprole and lambda-cyhalothrin on adults and larvae of the green lacewing, Chrysoperla johnsoni Henry, Wells and Pupedis an important generalist predator in western United States pear orchards. We applied formulated pesticides using their high label rates mixed with 935 liters/ha of water on pear trees utilizing an airblast sprayer. We collected leaves from the experiment trees at 1, 7, 14, 21 days after treatment (DAT) and exposed C. johnsoni adults and second instars to insecticide residues or untreated control for 72 h. We monitored larvae that survived the treatments until adult emergence (for larvae) or adults until death (for paired adults). We assessed the adults for acute and chronic mortality, longevity, fecundity, and fertility, and larvae for acute mortality, sex ratio, developmental time, and survival of adults emerged from treated second instars, to determine lethal and sublethal effects. The field-exposed insecticide residues of chlorantraniliprole exhibited higher lethal and sublethal toxicities on C. johnsoni during the 21-d leaf collection period when compared with the field-exposed residue toxicities of lambda-cyhalothrin and spinetoram. The field-exposed residue of lambda-cyhalothrin and spinetoram exhibited moderate toxicities on C. johnsoni during the 21-d leaf collection period. Results from this study show similar trends with previous studies using multiple routes of exposure laboratory assays and field experiments on Chrysoperla sp. The direct and indirect effects of field-aged residues of spinetoram, chlorantraniliprole, and lambda-cyhalothrin on C. johnsoni are discussed.

Funder

Washington Tree Fruit Research Commission

USDA-NIFA SCRI

Oregon State University

Publisher

Oxford University Press (OUP)

Subject

Insect Science,Ecology,General Medicine

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