Esteem® + fertilizers: red imported fire ant suppression in hay pastures using application of Esteem® (pyriproxyfen) ant bait and granular fertilizer hopper blends
msra
摘要
The concept of applying dry fertilizer with a broadcast-applied bait product for the suppression of the red imported fire ant, Solenopsis invicta Buren (Hymenoptera: Formicidae) promises to reduce application cost by eliminating a trip across the field. Earlier work (Barr 1991) indicated that blending a bait-formulated fire ant insecticide with dry fertilizer quickly reduces the acceptability of the bait product compared to not blending the bait with fertilizer. However, ants were not repelled by the fertilizer and retrieved bait when applied simultaneously but without prior blending. This concept was demonstrated using a "tandem" treatment in a field trial by mounting the Herd GT-77 model broadcast seeder on top of a dry fertilizer spreader (Drees et al. 1994). Assessment of an ant bait product formulation blended with encapsulated dry fertilizer in a field trial resulted in spotty performance of the bait, in part, because the bait separated from the fertilizer in the hopper due to the different weights of the particles, and because the broadcast of heavier fertilizer particles with the light weight bait likely resulted in differential swath widths between the two components. With the recent labeling of Esteem® Ant Bait (pyriproxyfen, Valent U.S.A.) for use in hay pastures, there is a renewed interest in blending fire ant bait with fertilizer. Esteem® Ant Bait, also sold as Distance® Ant Bait in urban markets, is an insect growth regulator (IGR) that produces a slow but extended period of 80 to 90 percent reduction of mounds or nests of the red imported fire ant. This trial was conducted to assess the feasibility of Esteem® Ant Bait blended with commercially provided dry fertilizer formulations to manage fire ant populations in a commercial hay pasture.
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