Bhatt, JayantKanwlada, Suresh2022-10-062022-10-062021https://krishikosh.egranth.ac.in/handle/1/5810188632The present investigation entitled "Study on Management of PhomopsisBlight of Brinjalcaused by Phomopsisvexans" was mainly focused on cultural characterization of Phomopsisvexans physiological requirements and its management. The disease appeared at all the stages of crop growth and spreads to aerial parts of plant mostly on leaves small spots, with circular to deep brown with light colored centre and dark margins. On potato dextrose agar medium, the colony was medium growing, fluffy with wavy margins, floccose in appearance, compact and thick; whitish to pale in color with distinct concentric ring .A distinct yellowish zone alternated with dark brownish zone was observed on the reverse side of the colony.with floccose mycelium and produced numerous black, globose to irregular pycnidia (up to 300 μm). conidia were one celled, hyaline and ellipsoidal (4.5-10.3 μm long × 1.8- 2.1 μm wide). Further, 25 °C was recorded optimum for growth. The maximum radial growth of P. vexans was recorded at PH 6.5 after different incubation periods. Further highest radial growth was observed in alternate dark and light. Among different carbon sources were observed the highest radial growth was noted in dextrose. Among the nine phyto-extracts including Neem, Tulsi, Karanj, Jatropha, Datura, Ashok, Parthenium, Mehndi, Neelgiri at 10, 20 and 30 per cent concentrations, the maximum per cent inhibition in growth of P. vexans was recorded in Neem leaf extract followed by Datura leaf extract at both concentrations. Fungicides namely Tebuconazole, Carbendazim 12% WP,Hexaconazole, Mancozeb 63% WP, Copper oxychloride, Carbandazim, Thiram, Propiconazole 25% EC,Copper Oxychliride 88% W/W, Copper oxychloride + Carbandazim and captan + Hexaconazole were tested for their efficacy against P. vexans under in vitro conditions using Poisoned food technique at four different concentrations (250, 500, 750 and 1000 ppm). It was observed that the maximum inhibition in growth of P. vexans was recorded by Propiconazole followed by Carbendazim at all the tested concentrations.EnglishThesis