Biological effect of 1-dodecanol in teneral and post-teneral Rhodnius prolixus and Triatoma infestans (Hemiptera: Reduviidae).
Topical application of 1-dodecanol was significantly more toxic against teneral first nymphs (1-3 h old) than post-teneral first nymphs (24 h old). The lethal dose ratios were 711,500 for Rhodnius prolixus and 3613 for Triatoma infestans. No significative difference between LD50 was found when 1-dodecanol was injected in recently hatched adult R. prolixus (1-4 h old) nor in older adults (24 h old). These values were similar to those calculated for deltamethrin (an effective triatomicide), showing that 1-dodecanol had no insecticidal properties when it was applied by injection. Topical application of high dose of 1-dodecanol (1 microg/i) on teneral first nymphs of R. prolixus, produced an interruption of the darkening process of the cuticle, and probably in the development of its physiological properties.
Cueto
Gastón Mougabure
GM
Centro de Investigaciones de Plagas e Insecticidas, Juan Bautista de la Salle 4397 (B1603ALO), Villa Martelli, Buenos Aires, Argentina. gmougabure@citefa.gov.ar
Zerba
Eduardo
E
Picollo
María Inés
MI
D000818:Animals; D007851:Dodecanol / Q000494:pharmacology*; D007306:Insecticides / Q000494:pharmacology*; D007928:Lethal Dose 50; D009758:Nymph / Q000187:drug effects; D012239:Rhodnius / Q000187:drug effects*; D013997:Time Factors; D014224:Triatoma / Q000187:drug effects*
D007306:Insecticides; D007851:Dodecanol