Degradation of the toxicant AC 217300 in Amdro imported fire ant bait under field conditions

Meer, Robert K. Van der; Williams, David F.; Lofgren, C. S.

doi:10.1021/jf00114a010

Cited by 32 publications

(16 citation statements)

References 3 publications

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“…It diffuses through the mitochondrial membrane and acts on the electron‐transport chain by inhibiting the flow of electrons from NADH through site I to the cytochrome b ‐ c 1 complex (site II) 16. Hydramethylnon is considered environmentally safe because it is photolabile,17 and has been successfully incorporated into granular baits for other ants.…”

Section: Introductionmentioning

confidence: 99%

An oral bioassay for the toxicity of hydramethylnon to individual workers and queens of Argentine ants, Linepithema humile

Hooper‐Bùi

Rust

2001

Pest Management Science

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We have developed an oral bioassay to determine the toxicity of hydramethylnon to individual workers and queens of the Argentine ant, Linepithema humile. We fed seven concentrations of hydramethylnon in suspension to individual workers or queens, determined the amount of hydramethylnon ingested and evaluated the individual ants for mortality 14 days later. At concentrations > or = 0.37 g liter-1, the amount of liquid the queens ingested decreased dramatically, indicating that Argentine ant queens may detect hydramethylnon. Significantly larger volumes of the two highest concentrations of the hydramethylnon suspension were ingested by the workers, compared to the lower concentrations, suggesting that hydramethylnon may act as a feeding stimulant for the workers. Worker mortality was higher than queen mortality at the highest concentrations tested. The highest worker mortality resulted when the ants ingested 1.03 micrograms of hydramethylnon per mg of ant tissue. At the highest concentration (1.0 g liter-1) tested, workers ingested almost 12 times as much active ingredient per mg of body weight as did queens, suggesting that, in order to increase mortality of queens, multiple feedings must occur.

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Section: Introductionmentioning

confidence: 99%

An oral bioassay for the toxicity of hydramethylnon to individual workers and queens of Argentine ants, Linepithema humile

Hooper‐Bùi

Rust

2001

Pest Management Science

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“…Experiments with methoprene residue under heat and UV light indicated that photolysis was the most signiÞcant mechanism of environmental degradation (Quistad et al 1975). Similar studies with Amdro (hydramethylnon) Þre ant bait have shown that UV light quickly degrades the active ingredient, suggesting that evening applications may be more effective than daytime applications (Vander Meer et al 1982).…”

Section: Table 3 Results Of the Means-separation Tests For One-way Amentioning

confidence: 86%

Efficacy of Broadcast and Perimeter Applications of S-Methoprene Bait on the Red Imported Fire Ant in Grazed Pastures

Aubuchon

Mullen

Eubanks

2006

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The red imported fire ant, Solenopsis invicta (Buren), is a major pest in the United States because of its painful sting. Toxic bait has been an important management tool against fire ants, but site registrations prohibit applications of most baits on grazed pastures. Extinguish, containing the insect growth regulator methoprene, was selected for this study because it has a broad site registration that includes grazed pastures. The primary objective of this research was to evaluate the efficacy for control of red imported fire ants by using broadcast applications of methoprene bait at a label rate of 1,121 g/ha versus applications around the perimeter of a target area at the reduced rate of 280 g/ha. Grazed pastures in Lee County, Alabama, and Chambers County, Alabama, were selected for this study, with broadcast treatments, perimeter treatments, and controls replicated three times at each site. All mounds were counted and rated using the USDA population index before applications and then at 8 and 16 wk posttreatment. Perimeter applications did not significantly reduce S. invicta mound abundance, but bait treatments significantly reduced mound abundance at 16 wk posttreatment at site 1 where applications were conducted in early evening. However, broadcast applications were not effective at site 2 where treatments were conducted in early morning with warmer temperatures. Emergence of winged alates was observed at 12 wk posttreatment, followed by a high density of incipient mounds that may have masked the full treatment effect of methoprene applications at site 2. Methoprene bait was effective in reducing abundance of S. invicta only when full label rates were applied.

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“…The LT 15 and LT 50 CLs did not overlap for hydramethylnon based on moribund/dead data obtained from the two separate delayed toxicity tests (Tables 4 and 5). Variation in delayed toxicity among separate tests has occurred with mirex and hydramethylnon baits (Banks et al 1977, Vander Meer et al 1982). The differences may be attributed to many unspeciÞed factors among different studies (e.g., temperature, ant size, and nutritional needs) that could contribute to experimental variation.…”

Section: Resultsmentioning

confidence: 99%

“…To determine the time required to reduce the brood and adults in colonies and kill queens, colonies of S. invicta that were reared from newly mated queens (Banks et al 1981) were provided access to the Þre ant baits containing the active ingredients (AIs) spinosad (0.015% [AI], Ortho Fire Ant Killer Bait Granules, The Ortho Group, Columbus, OH), indoxacarb (0.045% [AI], registered in 2004 as Advion, E. I. du Pont Nemours, Wilmington, DE), hydramethylnon (0.73% [AI], Siege Pro, BASF, Research Triangle Park, NC), and a control of 30% by weight once-reÞned soybean oil (Vander Meer et al 1982) absorbed into pregel, defatted, corn grit (Illinois Cereal Mills, Paris, IL). Soybean oil and corn grit are commonly used in commercial Þre ant baits as a food bait and carrier, respectively.…”

Section: Methodsmentioning

confidence: 99%

Speed of Efficacy and Delayed Toxicity Characteristics of Fast-Acting Fire Ant (Hymenoptera: Formicidae) Baits

Oi¹,

Oi²

2006

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Efficacy and speed of action of fire ant (Hymenoptera: Formicidae) baits that claim fast control of colonies were compared with a standard bait. More than 85% of red imported fire ant, Solenopsis invicta Buren, laboratory colonies provided bait containing the active ingredient indoxacarb died within 3 d, and all colonies were dead in 6 d. Standard bait containing hydramethylnon resulted in death of 60% of the colonies in 9 d. Bait containing spinosad did not cause colony death. Under field conditions, one-half of the areas treated with the indoxacarb bait did not have any active fire ant nests within 3 d, whereas 11 d was needed to reach the same level of control with the hydramethylnon bait. Spinosad had a maximum of 17% of the treated areas without nests after 3 d. The delay in death of S. invicta adults treated in the laboratory with the indoxacarb and spinosad baits was shorter than the standard hydramethylnon bait, which had mortality similar to the traditional delayed toxicity criterion of < 15% mortality after 24 h and > 89% mortality over the test period. Indoxacarb caused mortality of 57% at 24 h and 100% at 48 h; however, visual symptoms of toxicity were not readily observed for at least 8 h before the abrupt increase in death. Spinosad caused 96% mortality by 24 h, and initial mortality became apparent at 4 h. Time required for death of 15% of a treated population (LT15) of spinosad, indoxacarb, and hydramethylnon was 3, 9, and 16 h, respectively. Delayed toxicity characteristics of the fast-acting indoxacarb bait may be useful for the development of other fast-acting ant baits.

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Degradation of the toxicant AC 217300 in Amdro imported fire ant bait under field conditions

Cited by 32 publications

References 3 publications

An oral bioassay for the toxicity of hydramethylnon to individual workers and queens of Argentine ants, Linepithema humile

An oral bioassay for the toxicity of hydramethylnon to individual workers and queens of Argentine ants, Linepithema humile

Efficacy of Broadcast and Perimeter Applications of S-Methoprene Bait on the Red Imported Fire Ant in Grazed Pastures

Speed of Efficacy and Delayed Toxicity Characteristics of Fast-Acting Fire Ant (Hymenoptera: Formicidae) Baits

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