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| Publication Type:
| Report |
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| Author(s): | Gold, Roger;
Howell, Harry;
Summerlin, Bill |
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| Author Affiliation: | Department of Entomology, Texas A&M University |
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| Title: | Field evaluation of eradicator for fire ant control, 1992 |
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| Section: | Urban, industrial, and structural
Other records with the "Urban, industrial, and structural" Section
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| Source: | Arthropod Management Tests. Vol. 21, 1996, p. 387. |
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| Publishing Information: | Annapolis, MD: Entomological Society of America |
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| # of Pages: | 1 |
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| Abstract/Contents: | "To determine the efficacy of water, chlorpyrifos and permethrin as control agents when applied with the Eradicator pest control device, sixty mounds of RIFA were selected for treatment. Each mound was characterized and mapped before treatment to determine any colony movement resulting from treatments. Treatments were made using an Eradicator control device attached to a water source providing ca 40 psi (actual pressure was measured). The Eradicator is a hose end sprayer fitted with a 2.5 ft probe, open at the end, which when inserted into fire ant mounds released a stream of water and pesticide. A reservoir attached to the underside of the Eradicator held the pesticide drawn into the water stream by the venturi effect. Treatments involved the insertion of the Eradicator application probe and injection of liquid into the mound. A flow meter determined the amount of liquid injected into each mound. Eradicator field evaluations were done in a Brazos County, Texas pasture. A metal wire was probed into each colonu and vibrated to disturb the surface of the mound to determine ant activity. Ants responding to this disturbance within the first thirty seconds were counted. A Lichert scale was developed to describe ant activity as follows: 0 = inactive, 1 = minor activity (1-50 ants), 2 = moderate activity (51-100 ants), and 3 = fully active (100+ ants). Mounds selected for this study had an activity rating of 3. Treatments were a non-treated control that received neither pesticide nor water; a water only treatment applied at the rate of 1 gal per mound; chlorpyrifos (0.5% AI) insecticide applied at the rate of 1 gal per mound; and 0.25% permethrin insecticide applied at the rate of gal per mound. Fifteen fully active RIFA mounds were treated on 1 Dec. 1992. Assignment of treatments to mounds was done in advance using a table of random numbers. RIFA mound activity levels were measured at 1, 7, 14 and 28 DAT. Colony migration or relocation was observed during the posttreatment evaluations. A 5/8 inch rubber garden hose attached to the Eradicator provided water at 22 psi using an electric centrifugal pump. Flow rates were monitored with a Flowmaster Flowmeter plumbed in line adjacent to the Eradicator. The Flowmeter insured uniform application of 1 gal of liquid per mound. Mounds were probed and treated in five locations with approximately 0.2 gal per injection site (one injection in the center of the mound and one injection in each of the four quadrants). The application rate was 0.64 gal/min. It took approximately 2 min to treat each mound in these tests. Eradicator calibration was done on site using the flow meter and a graduated cylinder. It was determined that 3 oz of pesticide were drawn from the chemical reservoir for each gal of water delivered through the probe. The concentration of technical pesticide placed in the reservoir was then adjusted through dilution with water to insure uniform application rates. Chlorpyrifos (42.8% AI) was diluted 1:1 with water to yield a 5% finished solution at the end of the probe. The permethrin (36.8% AI) was diluted 1:2.5 to yield a 0.25% finished solution. Control and water only treated mounds remained fully active throughout the test and were significantly different from the chlorpyrifos and permethrin-treated mounds. There was no apparent movement of the ant mounds although the treatment with water was initially disruptive. There was no measurable mortality in the control or water only mounds through 28 DAT. Both chlorpyrifos and permethrin were effective in reducing RIFA colony activity when injected with the Eradicator application system. By 14 DAT 100% of the colonies were inactive when treated with a 0.5% chlorpyrifos solution, while 0.25% permethrin completely reduced activity in 80% of the colonies. The Eradicator was effective in delivering the pesticides to the RIFA mounds." |
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| Language: | English |
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| References: | 0 |
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| Note: | Tables |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Gold, R., H. Howell, and B. Summerlin. 1996. Field evaluation of eradicator for fire ant control, 1992. Arthropod Manage. Tests. 21:p. 387. |
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