Vol. 10, Issue 11 (2021)

Author(s):
Mateti Gayithri, RR Ahir, Pinki Devi Yadav and Ranjana Meena

Abstract:
Carrot (Daucus carota subsp. sativus) is most vital vegetable root crop with enormous medicinal, health and nutritional value. Carrot comes under Umbelliferae family and has a large edible conical root. Afghanistan is the main centre of origin. Among the foliar diseases of carrot, the Alternaria Leaf Blight is major one, which occurs worldwide. An in vitro study was conducted on effect of different temperatures, relative humidity and pH on growth of Alternaria alternata under laboratory of Department of Plant Pathology, S.K.N. College of Agriculture, Jobner. Results disclosed that among the physical parameters, temperature, pH and relative humidity, the mycelial growth was best at 25 ⁰C (89.00 mm), more dry mycelial weight at pH 6.0 (810 mg) and relative humidity 100% (89.25 mm) showed better mycelial growth. Single spore technique was used for the purification of the fungus. Pathogenicity was proved by spore cum mycelial suspension spray on the carrot leaves showed that Alternaria alternata was pathogenic to carrot crop.