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Title: NATURAL AND SUCROSE ESTERS AS BIORATIONAL INSECTICIDES IN FIELD TRIALS AGAINST THE SILVERLEAF WHITEFLY BEMISIA ARGENTIFOLII

Author
item Akey, David
item CHORTYK, O - USDA RETIRED, ATHENS, GA
item Pittarelli, George
item STEVENSON, M - USDA-ARS, TIFTON, GA
item Henneberry, Thomas

Submitted to: Silverleaf Whitefly: 1997 Supplement to the Five Year National Research and
Publication Type: Abstract Only
Publication Acceptance Date: 8/1/1997
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: Comparisons were made between an extract of a natural acyl sugar ester extracted from Nicotiana trigonophalla and 2 concentrations of a synthetic one, OTC8SE; concentration expressed as percent volume. In 1995, this chain was the most effective synthetic sugar ester of those tested at a concentration of 0.3%. Test with natural sugar extract was at 0.3%. Plot trials were conducted at MAC, U of A, Maricopa AZ in 1996 against the silverleaf whitefly (SLW). Six treatments were applied 6 times at weekly intervals. Treatments included embedded controls, an additional untreated check block of 1.5 acres, and a pymetrozine/fenoxycarb treatment used as an efficacy standard. Applications were by ground at 15 gal./ac at 225 PSI via drops that sprayed upward. Efficacies were expressed as percent reduction in SLW from the block control. Number of SLW was relatively low throughout the season. Mean no. of eggs/3.88 sq. cm ranged from 136.7-52.1 and were not significantly different from one another. Large nymphs ranged from 16.0-0.4 and were not significantly different. Second trial was conducted at end of season after SLW population had increased considerably. Synthetic sugar ester had a mean of 298.7 eggs and pymetrozine/fenoxycarb had 271.1; these were significantly different from the former at P = 0.05%. Results for large nymphs showed significance for the active agents with these of 26.93 for pymetrozine/fenoxycarb to 31.73 for an extract of Nicotiana gossei compared to 71.5 and 54.7 for 2 controls.