2. Institutional Publications

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Author: search.filters.author.Madhavan Nair, GHas files: Yes

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    Use of some insecticides and their mixtures for control of brinjal pests
    (Kerala Agricultural University, 1976) Madhavan Nair, G; Nair, M R G K
    A field experiment undertaken to compare the relative efficiency of some common insecticides and their mixtures in controlling the p.jst of brinjal showed that carbaryl, phosphamidon and carbaryl + phosphamidon, phosphamidon + BHC and endrin 4 thiometon gave effective protection to the crop from insect infestations in general. The only mixture which was found better than the components was that of endrin and thiometon. For an overall control of brinjal pests, carbaryl and phosphamidon in that order of preference have been recomended, taking into consideration of the dicision of Government of India to phase out endrin by 1977.
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    Relative efficiency of some foliar insecticidal treatments for the control of Helopeltis antonii signoret infesting cashew trees
    (Kerala Agricultural University, 1982) Madhavan Nair, G; Abraham, C C
    The relative field efficiency of endosulfan (0.05%), phosphamidon (0.03%), carbaryl (0.15%), quinalphos (0.05%), monocrotophos (0.05#), fentnion (0.05#) fenitrothion (0.05%), phosalone (0.1$) and formothion (0.05$) against Helopeltis antonii Signoret (Hemiptera; IVIiridae) was evaluated in a field experiment conducted in the Cashew Research Station, Vellanikkara during the flushing and fruiting seasons (October-February of three years, namely, 1978-79, 1980-81 and 1981-82). Three rounds of high volume sprayings were given, synchronising with the emergence of flushes, flowering and fruit initiation stages and the intensity of damage was scored on a 0-4 scale based on observations on twenty randomly selected shoots and panicles. Endosulfan (0.05%), carbaryl (0.15%), phosphamidon (0.03%) and quinalphos (0.05%) were found to be relatively more effective in reducing shoot and floral infestations.
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    Relative efficiency of some of the common insecticides and their joint formulations with carbaryl against the tea mosquito bug (Helopeltis antonii signoret) infesting cashew trees
    (Kerala Agricultural University, 1984) Madhavan Nair, G; Abraham, C C
    The relative efficiency of endosulfan (0.05%), phosphamidon (0.03%), monocrotophos (0.05%), carbaryl (0.15";,) and HCH (0.15%) and their joint formulations with carbaryl against the tea mosquito bug Helopeltis antonii Signoret was evaluated in a field experiment conducted in the Cashew Research Centre, Madakkathara, Trichur during two consecutive years 1 980-81 and 1 981 -82. Three rounds of sprayings were given in each year using a rocker sprayer Fitted with 'hi-tree' lance attachment at the times of new vegetative flush formation, panicle emergence and at fruit set initiation. The intensity of pest damage was recorded from twenty numbers of randomly selected shoots and panicles on a 0-4 scale. All the insecticides and their joint formulations were effective in reducing the intensity of damage by the mosquito bugs. Ths joint application of phosphamidon (0,015%) + carbaryl (0.075^) was consistently superior to endosulfan (0.025%) + carbaryl (0.0755') and HCH (0.15#) in reducing shoot and panicle damage. HCH (0.075%) -f- carbaryl (0.075%) was on par with phosphamidon (0.015%) + carbaryl (0-075%) in reducing the infestation. However, the conjunctive use of insecticides did not show superior performance as compared to their individual applications, except in the case of HCH + carbaryl in which case, the combined application was found to be superior to HCH. But this mixture was not superior to carbaryl applied alone.
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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.