title: Toxicity and transmission of thiamethoxam in the Asian subterranean termite Coptotermes gestroi (Isoptera: Rhinotermitidae).
abstract: The toxicity and horizontal transmission of thiamethoxam was evaluated in the workers of the Asian subterranean termite Coptotermes gestroi Wasmann (Isoptera: Rhinotermitidae). Brief exposure to sand treated with thiamethoxam at concentration ranging from 0.25 to 50 µg/ml resulted in a dose-dependent mortality in C. gestroi. Sand treated with 50 µg/ml thiamethoxam resulted in very high mortality within 30-60 min of exposure. Termites exposed to sand treated with 0.25-25 µg/ml exhibited delayed toxicity and nonrepellency in C. gestroi. A horizontal transmission study using 25 µg/ml of thiamethoxam at donor-recipient ratio of at least 2:5 (treated:untreated) indicated that thiamethoxam can be transferred between exposed and unexposed workers, resulting in significant termite mortality in unexposed termites within 1-3 d post exposure.
authors.affiliation: Department of Forest Products and Paper Science, College of Forestry and Natural Resources, University of the Philippines Los Banos College, Laguna 4031, Philippines mnacda@yahoo.com.
authors.forename: Menandro N
authors.initials: MN
authors.lastname: Acda
mesh_terms: D000818:Animals; D004305:Dose-Response Relationship, Drug; D007306:Insecticides / Q000008:administration & dosage / Q000633:toxicity*; D020049:Isoptera / Q000187:drug effects*; D000073943:Neonicotinoids; D009574:Nitro Compounds / Q000008:administration & dosage / Q000633:toxicity*; D010078:Oxazines / Q000008:administration & dosage / Q000633:toxicity*; D012987:Soil; D000077922:Thiamethoxam; D013844:Thiazoles / Q000008:administration & dosage / Q000633:toxicity*; D013997:Time Factors
chemical_list: D007306:Insecticides; D000073943:Neonicotinoids; D009574:Nitro Compounds; D010078:Oxazines; D012987:Soil; D013844:Thiazoles; D000077922:Thiamethoxam
keywords: Coptotermes gestroi; horizontal transmission; nonrepellent; termite; thiamethoxam