Reference

Comparative toxicity of chlorfluazuron (IKI-7899) and cypermethrin to Spodoptera littoralis, Lobesia botrana and Drosophila melanogaster

Comparative toxicity of chlorfluazuron (IKI-7899) and cypermethrin to Spodoptera littoralis, Lobesia botrana and Drosophila melanogaster. Ishaaya, I.; Navon, A.; Gurevitz, E. (Volcani Cent., ARO, Bet Dagan 50-250, Israel). Crop Prot., 5(6), 385-8 (English) 1986. CODEN: CRPTD6. ISSN: 0261-2194. DOCUMENT TYPE: Journal CA Section: 5 (Agrochemical Bioregulators) Chlorfluazuron (I) [71422-67-8] sprayed on cotton seedlings was more efficient than cypermethrin (II) [52315-07-8] against third-instar larvae of the Egyptian cotton leafworms, S. littoralis. At a concn. of 3.2 ′ 10-5%, I caused 98% larval mortality and II 35%. All larvae in I assays died during moulting; hence the leaf area consumed during the test instar was not appreciably affected. On the other hand, in II assays, larvae died during the intermoult stage. I inhibited potency similar to that of II on third-instar larvae of the grape berry moth L. botrana, resulting in 90-95% and 33-34% mortality in treatment concns of 5 ′ 10-3% and 2 ′ 10-4%, resp. In another grapevine pest, D. melanogaster, II suppressed larval and adult formation to a greater extent than I. The high potency of I on various insects, together with its low toxicity to man and the environment, renders this compd. a potential agent for controlling important agricultural pests.

Insect growth regulators: mode of action on the cat flea, Ctenocephalides felis (Siphonaptera: Pulicidae)

Insect growth regulators: mode of action on the cat flea, Ctenocephalides felis (Siphonaptera: Pulicidae). El-Gazzar, L. M.; Koehler, P. G.; Patterson, R. S.; Milio, J. (Dep. Entomol. Nematol., Univ. Florida, Gainesville, FL 32611, USA). J. Med. Entomol., 23(6), 651-4 (English) 1986. CODEN: JMENA6. ISSN: 0022-2585. DOCUMENT TYPE: Journal CA Section: 5 (Agrochemical Bioregulators) Four insect growth regulators, Ro 16-1295 [85983-12-6], methoprene [40596-69-8], fenoxycarb [72490-01-8], and Ro 15-8630 [85983-04-6], caused 99% redn. in larval-to-adult (emerged) development of the cat flea, C. felis, when they were incorporated in the larval rearing medium at rates of 10.5, 13.3, 15.9, and 41.6 pb, resp. Significantly higher concns. of hydroprene [41096-46-2] (355.6 ppb), Pro-Drone [53905-38-7] (648.5 ppb), and CGA-112913 [71422-67-8] (4.500 ppm) had to be applied to achieve the same result. Methoprene, Pro-Drone, Ro 15-8630, and CGA-112913 affected mainly the pupal stage (adult emergence), while fenoxycarb and Ro 16-1295 affected both larval (cocoon formation) and pupal stages. At lower concns. hydroprene affected the pupal stage more than the larval stage, but at higher concns. it affected both stages equally. When methoprene was applied to larvae from 1.5 to 5.5 days old, no significant differences were noticed for larval and pupal mortalities among the different ages. Adult emergence was reduced by 84% when cocoons less than 2 days old were exposed to 0.01 ppm of methoprene. Methoprene, fenoxycarb, Ro 15-8630, hydroprene, and Pro-Drone caused from 1 to 5% of larvae to pupate without spinning silk cocoons.