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J Chem Ecol

Title:		Pheromone response inhibitors of the corn stalk borer Sesamia nonagrioides. Biological evaluation and toxicology
Author(s):		Riba M; Sans A; Bau P; Grolleau G; Renou M; Guerrero A;
Address:		"Escola Tecnica Superior Enginyeria Agraria, UdL-IRTA, Lleida, Spain. mriba@quimica.udl.es"
Journal Title:		J Chem Ecol
Year:		2001
Volume:		27
Issue:		9
Page Number:		1879 - 1897
DOI:		10.1023/a:1010468911352
ISSN/ISBN:		0098-0331 (Print) 0098-0331 (Linking)
Abstract:		"The behavioral activity of some trifluoromethyl ketones (TFMKs) as inhibitors of the pheromone activity of the corn stalk borer Sesamia nonagrioides (Lef.) (Lepidoptera: Noctuidae) is reported. The most closely-related analogue to the pheromone tested, (Z)-11-hexadecenyl trifluoromethyl ketone (Z11-16:TFMK), elicited a significant decrease in the number of male catches in traps baited with mixtures with the pheromone in 1:1 and 10:1 ratios in comparison to the pheromone alone. The E isomer of the analogue as well as two highly hydrated ketones, 3-octylthio-1,1,1-trifluoropropan-2-one (OTFP) and 1,1-difluoropentadecyl trifluoromethyl ketone, were inactive. Conversely, the saturated TFMKs n-dodecyl trifluoromethyl ketone and, particularly, n-hexadecyl trifluoromethyl ketone induced a synergistic effect when mixed with the synthetic pheromone in 10:1 ratio. However, in a wind tunnel these chemicals did not elicit any differential effect on flying moths attracted to a source containing a 10:1 blend of the analogue and the pheromone. In a dual choice bioassay with two dispensers, containing the pheromone alone, and mixtures of Z11-16:TFMK and the pheromone and separated 5 cm apart, males showed no particular preference for either dispenser. The ketone mixture, however, induced moths to execute erratic flights with frequent crosswind counter-turns and intersections with plume boundaries. The total number of contacts with the source were reduced when a control dispenser was paired with a dispenser containing Z11-16:TFMK and pheromone. Z11-16:TFMK and OTFP showed little toxicity on mice with a LD50 of 1 g/kg after the 6th day of treatment. For comparitive purposes, the major component of the pheromone, Z11-16:Ac, displayed a LD50 of 5 g/kg 6 days after application. Our results provide additional information about the activity of the TFMKs, which might be useful for the utilization of these chemicals in future pest control studies"
Keywords:		"Animals Behavior, Animal Female *Flight, Animal Ketones/*chemistry/*pharmacology Male Moths/*chemistry/physiology Pheromones/*chemistry/*pharmacology Wind;"
Notes:		"MedlineRiba, M Sans, A Bau, P Grolleau, G Renou, M Guerrero, A eng Research Support, Non-U.S. Gov't 2001/09/08 J Chem Ecol. 2001 Sep; 27(9):1879-97. doi: 10.1023/a:1010468911352"