Cotton leafhopper

A total of 27 cotton Gossypium hirsutum genotypes were field evaluated during 2018-19 at Regional Agricultural Research station Nandyal under AICRP-Cotton programme for their reaction towards sucking pests, leaf hopper Amrasca devastans Distant in particular and bollworms. Results revealed that all the test genotypes were moderately tolerant towards sucking pest particularly leaf hoppers and exhibited below economic threshold level populations but among them, genotype CNH-2052 had recorded lowest leafhopper population of 2.

7p chauchaungayxua11 23-03-2021 8 1   Download

Brinjal (Solanum melongena L.) is an important solanaceous vegetable crop in sub-tropics and tropics. Adults and nymphs of Leaf hopper feed on the underside of the leaves by sucking plant sap, which results in yellowing and curling of leaves. It also injects toxic material into the leaves, which causes necrosis.

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The bioassay was carried out in the laboratory at Regional Agricultural Research Station, Lam, Guntur at normal room temperature and humidity conditions during 2016-17. The commonly used neonicotinoid insecticides viz., imidacloprid 17.8 SL, acetamiprid 20 SP, thiamethoxam 25 WG and two organophosphate insecticides viz., acephate 75 SP and monocrotophos 36 SL were selected as test insecticides.

6p nguaconbaynhay7 15-08-2020 11 1   Download

The field experiment on cotton productivity and leaf reddening as influenced by nutrition management for targeted yield was conducted during growing seasons of 2014-15 and 2015-16 at College of Agriculture Farm, Raichur, Karnataka on medium deep black soil under irrigation.

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Field experiments was conducted during kharif season 2014-2015 to study the influence of meteorological factors on the incidence of major pests of cotton. Incidence of aphids was initiated in 32nd MW (35.0/ leaf) and aphid population was lowest in 42nd and 43rd MW (0.2/ leaf). It has attained its initial peak during 32nd MW (35.0/ leaf) which was favored by min. temp. of 31.99oC and max. temp. of 33.59oC with morning 95.86 % and evening 78.86 % humidity along with 10.0 mm rainfall. Incidence of leaf hoppers was initiated in 34th Mw (0.

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A set of 52 leaf hopper resistant cotton accessions were evaluated in during Kharif 2017. Multivariate analysis employing Principal Component Analysis (PCA) identified seven principal components were accounted for a cumulative variation of 99%.

8p nguaconbaynhay4 22-03-2020 11 2   Download