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Author: search.filters.author.Abraham, C CSubject: search.filters.subject.phosalone

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    Toxicity of newer insecticides to the coconut caterpillar Nephantis Serinopa Meyr and its parasite Bracon Brevicornis Wesmeal
    (Kerala Agricultural University, 1978) Kunjamma P Mathew; Nair, M R G K; Abraham, C C
    The LD 50 levels of toxicity of phosalone, endosulfan, malathion, quinalphos, fenthion, phosphamidon. monocrotophos, fenitrothion, dichlorvos, BHC and carbaryl to 4th instar larvae of the coconut caterpillar Nephantis seringa were 0.02428, 0,02925, 0.05288, 0.05614, 0.08416, 0.09477, 0.09833, 01013, 0.1639, 0.2920and 0.4990 respectrvely. Toxicity of residues of dichlorvos 0.05%, fenitrothion, 0.05%, malathion 0.05% on coconut leaves to 1st instar larvae of N. serhwpa had become negligible on the 8th day of their application and that of residues of quinaiphos 0.05%, phoslone 0.05% and BHC 0.2% on the 16th day of application; residues of carbaryl 0.2%, and monocrotophos 0.02% showed toxicity beyond 16 days. Toxicity of residues of the same concentrations of dichlorvos, fenitrothion, fenthion, endosulfan and phosphamidon on coconut leaves to adults of Bracon brevicomis had become negligible in 8 days of application and that of residues of malathion, quinaiphos, phosalone and BHC in 16 days of application; residues of monocrotophos and crabaryl remained toxic to parasites beyond 16 days.
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    Control of helopeltis antonii signoret infesting cashew using dusting powder formulations of some common insecticides
    (Kerala Agricultural University, 1983) Madhavan Nair, G; Abraham, C C
    The relative efficiency of the dusting powder formulations of phosalone (Zolone 4% ), BHC (BHC 10°^ ). mercaptothion (Cythio.T 10%), quinalphos (Ekalux 4% } and carbaryl {Sevin 10% ) against Helopeltis antonii S. (Heteroptera: Miridae) was evaluated in a field experiment conducted in the Cashew Research Station, Madakkathara, during October—February in 1978-79, 80-81 and 81-82. Three rounds of dusting were given, synchronising with the emergence of flushes, flowering and fruit intiation stages and the intensity of damage was scored on a 0-4 scale based on observations on twenty randomly selected shoots and panicles. Dusting powder formulations of carbaryl, and phosalone were found equally effective and superior to mercaptothion in reducing shoot damage caused by H. antonii. Nons of the chemicals was effective in reducing damage to freshly emerged panicles and also the floral branches beyond fruit set initiation.