Disease reaction of sunflower genotypes against sunflower necrosis virus disease and its vector Thrips palmi under field condition.

摘要

Study was carried out under field condition during kharif of 2005 to assess the disease reaction of different genotypes of coordinated entries in the management of sunflower necrosis disease and its thrips vector. Necrosis disease ranged from 0.0 to 8.2% at 30 DAS; 0.0 to 8.3% at 45 DAS; 0.0 to 8.4% at 60 DAS and 0.0 to 8.5% at 75 DAS. The genotypes such as DRSF-116, KBSH-4, 65-A41, IH-655, LSFH-40218, PAC-091, IH-land NSH-16 recorded low mean thrips number ranging between 1.0 to 1.50 per five plants, however, about 41 and 20 genotypes ranged between 1.6 to 2.0 and 2.1 to 3.0 mean thrips per five plants. Among 69 genotypes screened against necrosis disease and thrips, five entries viz. IH-650, IH-651, LSF-402-18, 64A-43 and SF-4132 were found free from necrosis disease incidence and 22 entries had low mean thrips number of less than two per five plants throughout the crop growth period.