• GOLLA MAHESH BABU YADAV
• GOLLA MAHESH BABU YADAV
• DR J P MISHRA

ABSTRACT Onion basal rot is a destructive disease, caused by F. oxysporum f .sp. cepae. The pathogen was isolated from infected bulb and on the basis of morphological and cultural studies was identified as F. oxysporum f. sp.cepae.. Potato dextrose broth supported maximum dry mycelial weight on 10th day of incubation and potato dextrose agar supported maximum sporulation and radial growth. The temperature of 30°C, pH 6 was found to be best for fungal growth. Among the fourteen fungicides screened against pathogen tebuconazole 25 EC (0.1%) was found highly effective followed by combiproduct containing mancozeb 63%+ carbendazim 12%. Among eight botanicals screened against the pathogen NSKE was found better in inhibiting the pathogen followed by prickly chaff flower leaf extract at 5 per cent concentration. Among six bioagents evaluated, T. harzianum, T. virens and T.koningii were found effective in inhibiting the mycelia growth of the pathogen. Three nutrients viz., potassium chloride, zinc sulphate and magnesium sulphate were also screened against the pathogen, potassium chloride inhibited satisfactorily (21.82%) . The bioefficacy of fungicides, botanicals and bioagent which performed well in vitro condition were tested in vivo condition as well. Among them, seed treatment with T. harzianum+ drenching with mancozeb 63%+ carbendazim 12% at 0.3 per cent concentration were effective in reducing the per cent disease incidence of basal rot disease.

"IN VITRO STUDY OF ONION BASAL ROT CAUSED BY FUSARIUM OXYPORUM", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.7, Issue 5, page no.357-366, May-2020, Available :http://www.jetir.org/papers/JETIR2005361.pdf

"IN VITRO STUDY OF ONION BASAL ROT CAUSED BY FUSARIUM OXYPORUM", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.7, Issue 5, page no. pp357-366, May-2020, Available at : http://www.jetir.org/papers/JETIR2005361.pdf