Susceptibility of Different Populations of Nilaparvata lugens from Major Rice Growing Areas of Karnataka, India to Different Groups of Insecticides

Abstract: Susceptibility to insecticides was investigated by collecting field populations of brown planthopper from different locations of southern Karnataka, India (Gangavati, Kathalagere, Kollegala, Soraba and Mandya). All the field populations differed in their susceptibility to insecticides. In general, Soraba and Mandya populations were more susceptible to insecticides compared to Gangavati and Kathalagere populations. The resistance ratios varied greatly among the populations viz., chlorpyriphos (1.13 to 16.82), imidacloprid (0.53 to 13.50), acephate (1.34 to 5.32), fipronil (1.13 to 4.06), thiamethoxam (1.01 to 2.19), clothianidin (1.92 to 4.86), dinotefuran (0.82 to 2.22), buprofezin (1.06 to 5.43) and carbofuran (0.41 to 2.17). The populations from Gangavati, Kathalagere and Kollegala exihibited higher resistance to some of the older insecticides and low resistance to newer molecules

Effect of Nova Aminochelated-zinc on Growth and Yield of Rice (Oryza Sativa L.)

A field experiment was conducted during the kharif, 2018 to study the effect of Nova Aminochelated-Zinc on growth, yield and yield components of rice. The experiment was laid out in Randomized Block Design with six treatments T1: Control, T2: Recommended Dose of Fertilizers (RDF) without Zinc, T3: T2+5 ml l-1 Nova Ami-Zinc @TI and PI, T4:T2+2.5 gm l-1 ZnSO4 @TI and PI, T5: 5 ml l-1 Nova Ami-Zinc @TI and PI, T6: 2.5 gm l-1 ZnSO4 @TI and PI. Experiment revealed that application of RDF+5ml l-1 Nova Ami-Zinc @ TI and PI (T3) resulted in maximum Number of tillers m-2, Total number of Grains Panicle-1, Number of Filled Grains Panicle-1, Test weight and Grain Yield but application of RDF+2.5 gm l-1 ZnSO4 @TI and PI showed maximum height followed by application of RDF +5 ml l-1 Nova Ami-Zinc @ TI and PI.</jats:p

Kuluttajabarometri maakunnittain 2000, 2. neljännes

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