John H. Klotz

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The efficacy of five treatments to control Argentine ants around homes was evaluated. Most effective was a combination of a perimeter spray with fipronil + broadcast application of bifenthrin granules (93% reduction of ants after 8 wks). A sweet water bait with 0.001% imidacloprid provided ≈ 80% reduction of ants for one month. All of the treatments(More)
BACKGROUND Insecticides are commonly used for ant control around residential homes, but post-treatment runoff may contribute to contamination of surface water in urban watersheds. This study represents the first instance where runoff of insecticides was directly measured after applications around single family residences. During 2007, houses were treated(More)
Perimeter treatments with Termidor ® were evaluated for efficacy in reducing outdoor infestations of Argentine ants around homes in southern Cali-fornia. Treatments were applied according to the amended Termidor ® label restrictions, accepted by the California Department of Pesticide Regulation in 2009, limiting applications to the structure and not more(More)
Current control methods for the black carpenter ant, Camponotus pennsylvanicus (De Geer), include the use of remedial and preventative residual sprays as well as toxic baits. We evaluated the acceptance of three baits (Maxforce, Niban, and Baygon) to field colonies of the black carpenter ant in the spring and fall. Maxforce bait granules were more readily(More)
A high proportion of triatomine insects, vectors for Trypanosoma cruzi trypanosomes, collected in Arizona and California and examined using a novel assay had fed on humans. Other triatomine insects were positive for T. cruzi parasite infection, which indicates that the potential exists for vector transmission of Chagas disease in the United States.
A year-long survey of structural pest ants was conducted by Pest Management Professionals in San Diego, California, and Phoenix, Arizona to determine the species of ants, location of infestations, and types of treatments in residential and commercial accounts. Two short-term surveys were also conducted in Tucson, Arizona, and Tijuana, Mexico to obtain(More)
OBJECTIVE To identify ants other than Solenopsis invicta and Solenopsis richteri reported to cause adverse reactions in humans. DATA SOURCES We conducted a literature review to identify reports of medical reactions to ants other than S. invicta and S. richteri. Our review of medical and entomological literature on stinging ants was generated from MEDLINE(More)
The oral toxicity of boron compounds to the Argentine ant, Linepithema humile (Mayr), was evaluated in laboratory tests. The ants were provided 25% sucrose water containing 0.5 and 1% boric acid, disodium octaborate tetrahydrate, and borax. Lethal times of these solutions were a function of the concentration of boron. In field tests, the ants showed no(More)
Insecticide treatments were evaluated for efficacy in reducing outdoor infestations of Argentine ants around homes in southern California. Treatments were applied with the goal of reducing the amount of insecticides applied to control ants. Most effective was an experimental liquid bait formulated with 0.003% thiamethoxam as the toxicant. It reduced the ant(More)
We investigated whether the Argentine ant, Linepithema humile (Mayr), trail pheromone, Z9-16:Ald, could enhance recruitment to and consumption of liquid sucrose solutions. All tests were done as paired comparisons with a 10% sucrose solution as food. In the laboratory, mixing 20 microl of a 10-microg/ml solution of the pheromone with 50 microl of the 10%(More)