Clusterbean (Cyamopsis tetragonoloba L.) is an important crop of Rajasthan. Insect pests are the major constraints in the production and productivity of clusterbean. On this basis, an experiment was laid out with the view to find out the possibility of minimum incidence of insect pests during Kharif 2015 and 2017. Eight different treatment combinations along with untreated control were laid out in randomized block design with three replications. Minimum pooled PDI(10.48), minimum aphid incidence (0.7) and minimum jassid incidence (0.87) was achieved with the treatment T7 (Seed soaking for 30 minutes with streptocycline @ 500 ppm + seed dressing with carbendazim @ 2 g/kg) + (Seed treatment with fipronil 5% SC @ 4 ml/kg seed) + (Foliar spray with streptocycline @ 250 ppm +

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Background: Alternaria cyamopsidis (Rang. and Rao) causes Alternaria blight of clusterbean and it is one of the significant disease of clusterbean. Studies were conducted to compare the Cultural, morphological and pathogenic variability among ten isolates of Alternaria cyamopsidis from clusterbean, in five districts of Rajasthan viz., Bikaner, Barmer, Churu, Hanumangarh and Jaipur. Methods: During 2016-17 exhaustive survey was conducted in clusterbean growing areas of Rajasthan and collected diseased samples of clusterbean caused by Alternaria. All the samples were processed for isolation, purification and their pathogenicity was proved in cagehouse and laboratory and standard methods were adopted for cultural and morphological variability study. Result: All the isolates showed variation in their morphological characters, i.e., colony color and shape; conidial number, size, width, length, shape and septation on PDA. Out of ten isolates two isolate, viz., AlcyJp1 and AlcyJp2 showed maximum colony diameter 89.50 and 86.30 mm, respectively. All the isolates varied in their spore length and width and virulent on the tested variety of clusterbean for virulence. AlcyJp1 was the most virulent and produced maximum (65.50%) disease intensity, followed by AlcyJp2 isolate (61.22%).

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