2024, Vol. 7, Issue 10, Part A

author(s)
Jyothirmai Madhavi K, Lal Ahamed M and RDVJ Prasada Rao

abstract
All the blackgram and greengram genotypes screened under glasshouse conditions for resistance against PBNV and TSV showed hundred per cent infection with a range of symptoms from chlorosis to necrosis showing local and systemic infections. All the blackgram genotypes screened for PBNV and TSV were graded as highly susceptible as cent per cent disease incidence recorded. PBNV sap inoculations on blackgram showed zero per cent mortality in all the genotypes except in LBG-726 (10%) whereas TSV inoculations showed per cent mortality ranging from 0-80. LBG-731 and LBG-727 showed zero per cent mortality while LBG-726 and LBG-755 showed maximum mortality (80%) followed by LBG-20, LBG-22, LBG-611, LBG-738 and LBG-756 with 70%, LBG-623, Sarala and Berham with 60% and LBG-15, -685, -693, -745 and LBG-748 with 50%. Remaining blackgram genotypes showed per cent mortality less than 50. Artificial inoculations on greengram genotypes under glasshouse conditions with PBNV and TSV showed 100% disease incidence and graded as highly susceptible and the per cent mortality recorded was ranged from 0-20 and 0-100, respectively. Majority of the greengram genotypes inoculated with PBNV showed zero per cent mortality, while 10% mortality was observed in LGG-410, -460, -495, -496, -505, TRAM-1C, TRAM-5, TM-96-2, K-851 and Dhowli. Maximum per cent mortality (20%) was recorded in Kopergoan and LGG-490. TSV inoculations showed minimum per cent mortality (0%) in LGG-490 while maximum (100%) was recorded in LGG-499, LGG-503, LGG-505 and WGG-37 followed by Kopergoan and LGG-407 (90%), LGG-496 (88.8%) , K-851 (80%), LGG-480 (60%), LGG-481 (57.1%), LGG-485 (60%), LGG-503 (70%), LGG-469 (55.5%), LGG-495 (50%), LGG-497 (50%), TRAM-IC (50%) mortality. Hundred per cent disease incidence in glasshouse screening can be since there is no chance of escaping from the virus. Whereas under field conditions, there are chances to escape from viruliferous thrips in case of PBNV and escape either from lodging of TSV infected pollen or thrip visit or both.