Abstract
Additional tests with granulated mirex-soybean oil bait for control of the imported fire ant, Solenopsis saevissima richteri Forel, were conducted. An aerial application was made to a 960-acre plot containing land of variable terrain and ground cover. Eight months later 1 colony of ants was found on 1 of thirty-three ½- to 1½-acre observation plots. The total pretreatment count of ant colonies on these plots was 750, or an average of 23 per plot. Applications of bail made during the cooler part of the year (November-April) to open land in sunny weather gave good control (96-100%). However, fast and complete kills of ants was dependent upon warm weather. The bait in the previous tests contained 0.075% mirex, 14.925% soybean oil, and 85% corncob grits, and was applied at the rate of 12½ lb/acre. Bait containing 0.075, 0.15, or 0.3% mirex and applied at the rates of 3, 5, or 10 lb/acre all gave excellent control of ants. In general, observations have shown that areas treated with bait in the first half of the year become reinfested the next fall, while areas treated during the last half of the year will not become reinfested until the fall of the next year. In either case, the actual reinfestation appears to coincide with the period of greatest mating flight activity (May-June).
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