Suman KumarSharma, Vishal2019-01-242019-01-242018-07-24http://krishikosh.egranth.ac.in/handle/1/5810092334The present investigation entitled “Studies on anthracnose disease of cucumber” was undertaken to identify the pathogen associated with the disease, factors affecting disease development and evaluation of management practices against the disease. The anthracnose disease of cucumber was prevalent in all the five districts surveyed during 2017-18 viz., Kangra, Mandi, Bilaspur, Una,and Hamirpur in moderate to severe form but was predominantly present in Una and Hamirpur districts. Microscopic examination of the diseased samples posessed three pathogens viz., Alternaria alternata, Pseudoperonospora cubensis and Colletotrichum lagenarium. Based upon the symptomatology and morpho-cultural characteristics, the test pathogen was identified and confirmed as Colletotrichum lagenarium (syn. C.orbiculare) Potato dextrose agar was found to be the best medium for radial growth and Mathur’s media for sporulation of this pathogen. Temperature 250C was found best for both mycelial growth and spore germination , whereas sporulation occured at 30oC. 5-10 days old seedlings were found to be most susceptible to Colletotrichum lagenarium and the time lapse between inoculation and symptom expression increased as plant matured. The aggressiveness of the pathogen was less during the initial period of fungus growth thereafter it increased. Among other cucurbit hosts evaluated bottlegourd and watermelon were found susceptible to Colletotrichum lagenarium.The disease severity was positively correlated with maximum temperature and maximum RH. Fungicides carbendazim, propiconazole outperformed the other fungicides under in vitro conditions. Three foliar sprays of carbendazim followed by propiconazole was found to be highly effective in the management of anthracnose disease of cucumber.ennullThesis