PATEL, B. K.PATEL, Ashok R.2018-04-262018-04-261988http://krishikosh.egranth.ac.in/handle/1/5810044628Pigeon-pea (Cajanus cajan (L.) Millsp.) is an important pulse crop after gram in India. This crop is suffering from as many as 50 diseases. Among them, wilt and sterility mosaic are important one. Pigeon-pea wilt is one of the serious diseases, causing considerable damage to the crop in our country. Fungus (Fusarium solani) grew best on Richard's medium followed by potato dextrose broth. Potato dextrose broth supported maximum sporulation of the fungus followed by Richard's medium. An incubation of 15 days, 6.0 pti 0 and 27°C temperature were found best for the growth of F. solani. Among different nitrogen sources, potassium nitrate supported maxitium mycelial growth. BDtassium nitrate and sodium nitrate were found as best nitrogen sources for excellent sporulation. Sucrose was found best as carbon source for maximum mycelial growth. Sucrose and mannitol were found superior for maximum sporulation. Aerobic condition was found suitable for the excellent growth and sporulation of the fungus. Highest mycelial growth was found on the leaves of cotton, groundnut, arhar and castor, while, abundant sporulation was observed on cotton, groundnut and castor leaves, Arhar leaves produced abundant chlamydospore. Sandy soil showed highest wilt incidence while, lowest in black-cotton soil. Root-knot nematode inoculation (@1,000 larvae/plant) prior to fungus inoculation enhanced wilt in susceptible cultivar T-15-15. It also broke the resistance in case of resistant variety BDN-2. Antagonistic effect of fungus or interaction effect of fungus and host was observed on nematode infection. Wilt incidence was significantly reduced by treating the soil with margosa cake. Aspergillus niger foxind superior in inhibiting the mycelial growth followed by A. flavus. In vitro studies, Bavistin 50 wp, Bavistin + TMTD (25% m/m), Agrozim 50 wp, Bsnlate, Agrosan GN, Thimm, foltaf and Ditharve M-45 checked the growth of P. solani. Among all the seed dressers, Bavistin @ 0.2% was found most effective in checking the pre emergence rot and wilt incidence caused by F. solani. Bavistin, Agrozim, Bavistin + TMTD (25% m/m) and Benlate as the seed dressers significantly improved germination percentage and reduced wilt during seedling stage under field conditions. Pigeon-pea cultivar NP (WR)-15 was found resistant against P. solani. Whereas, cultivars viz. ICP-7336 and ICP-8863 were found moderately resistant under laboratory screening.enPlant Pathology, AgricultureA StudyThesis