Vol. 11, Issue 5 (2022)

Author(s):
Kalpana Yadav, Suresh Kumar, Sarita, Nitisha, NL Meena and Anil Kumar Sharma

Abstract:
Root and stem rot of cucumber is one of the most destructive disease in the worldwide. For development of effective control measures of this disease, six chemicals that is Hexaconazole, Mancozeb, Copperoyxchloride, Carbendazim, SAAF (Carbendazim 12%+ Mancozeb 63%) and Azoxystrobin in three concentrations (250,500 & 750 ppm), six phyto-extracts (Tagetes erecta, Occimum sanctum, Aloevera sp., Allium sativum, Eucalyptous globules and Azadiracta indica at three different concentrations (10%, 20%& 30%) were evaluated by poison food Technique and three bio-control agent (Trichoderma viride, T. harzianum and Bacillius subtilis) were also tested against mycelial growth inhibition of Fusarium oxysporum f. sp. radices cucumerinum by dual culture techniques respectively. Observations of the inhibitory effects on mycelial growth of the pathogen were observed of these chemicals, phyto-extracts and bio-agents. Among chemicals, Carbendazim completely inhibited (100%) or no mycelial growth of the pathogen was observedat 500 and 750 ppm concentration and at 250 ppm concentration it was also found best by inhibited 72.22 percent with 25.0 mm mycelial growth followed by SAAF (Carbendazim 12%+ Mancozeb 63%).It gave 61.11, 88.89 and 94.44 percent mycelia growth inhibition with 5.0 mm, 10.0 mm and 35.0 mm mycelia growth at 250,500 and 750 ppm concentrations respectively. Minimum mycelial growth inhibition (15.28, 42.22 and 51.67 percent) or maximum mycelial growth (76.25 mm, 52.00 mm and 43.50 mm) was recorded with Mancozeb at all three concentrations respectively. Out of six phyto-extracts, A. indica leaf extract was found more effective than others by inhibited 30.83, 51.39 and 69.17 percent growth inhibition with 62.25 mm, 43.75 mm and 27.75 mm mycelial growth at 10, 20 and 30 percent concentrations respectively. Among bio-control agents, Trichoderma viride was found most effective by inhibited maximum growth inhibition (65.83% inhibition) with minimum (30.75 mm) mycelial growth of the pathogen. Thus, fungicide, Carbendazim, phyto-extract, A. indica and bio-control agent T. viride can be used for the management of root and stem rot of cucumber in field condition.