Evaluation of black gram [Vigna mungo (L.) Hepper] genotypes against whitefly, Bemisia tabaci (Gennadius) under screen-house conditions

Taggar, G. and Gill, R. and Sandhu, J. (2013) Evaluation of black gram [Vigna mungo (L.) Hepper] genotypes against whitefly, Bemisia tabaci (Gennadius) under screen-house conditions. Acta Phytopathologica et Entomologica Hungarica, 48 (1). pp. 53-62. ISSN 0238-1249

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Abstract

Nine black gram genotypes were evaluated against B. tabaci at 3^rd trifoliate leaf stage using 100 whitefly adults per plant in multiple-choice test under screen-house during kharif 2009 and 2010. On the basis of whitefly resistance index (WRI) calculated over two years of study, the genotypes KU 99-20 and NDU 5-7 were categorized as moderately resistant as they recorded WRI of 1.50. The genotypes IPU 02-043, KU 7-602, KU 7-605, KU 7-618 and Mash 1-1 recorded WRI ranging from 2.59 to 3.05 and hence were categorized as susceptible. The remaining two genotypes, viz. KU 7-504 and KU 7-505 recorded the highest WRI ranging from 3.66 to 3.70 and thus, were categorized as highly susceptible to B. tabaci. All the genotypes, except KU 99-20 and NDU 5-7, scored leaf injury grade V after 6 weeks. Hence, it can be concluded that the optimum period for the complete differentiation of susceptible and resistant black gram genotypes could be taken between 5^th and 6^th week after release of whiteflies in multiple-choice test under screen-house conditions.

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