Maharana Pratap University of Agriculture and Technology, Udaipur

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    Biology and Management of Isabgol (Plantago ovata Forsk) wilt caused by Fusarium oxysporum Schlecht
    (MPUAT, Udaipur, 2022-05-05) ABHINAV; Bunker, R. N.
    An investigation was carried out on the wilt disease of isabgol caused by Fusarium oxysporum Schlecht, which is exerting the major threat in isabgol growing areas of Rajasthan. A rowing intensive survey was conducted to know the disease severity in potential isabgol areas of agro climatic zone IVA, IIB and IVB of Rajasthan state during Rabi season 2017-18 and 2018-19. The result indicated that maximum mean incidence of the disease was in Udaipur district (40.67%) followed by Chittorgarh (36.03%) and minimum was in Sirohi (27.54%) districts of Rajasthan. The infected plants were characterized by production of chlorosis, necrosis, premature leaf drop, browning of the vascular system. Morphological variability studies revealed that, conidia size, shape and colour of ten isolates obtained from samples exhibited considerable variation. RAPD technique was used to determine the variability among ten isolates of the pathogen. Highest genetic similarity was noted between SRH Fo2 and PRA Fo1 and lowest was observed between UDP Fo2 and PAL Fo1. The pathogenic variability of ten isolates of Fusarium oxysporum Schlecht were tested against single susceptible isabgol cv. GI -2 under in vitro condition. Results revealed that maximum virulence was recorded in isolate UDP Fo-1. Nine isabgol genotypes were screened under inoculated condition out of them Genotype UI-124, UI-2-1, UI-3-1, UI-6-1 and UI-125 were found moderately resistant. Other remaining genotypes UI-97, UI-80 and Vallabh Isabagol were found moderately susceptible and GI-2 was found susceptible against Fusarium oxysporum Schlecht. Estimation of yield loss study of Rabi 2017-18 and 2018-19 revealed that under unprotected condition (67.77%) loss has been observed compare to protected treatment. Studies on integrated disease management of wilt of isabgol showed that all treatment modules were found effective in suppression of wilt disease and were significantly superior over untreated inoculated control. The module consisting of soil application with neem cake mixture @100 gm/m2 plus treatment with Bavistin-50WP @ 2 gm/kg seed plus Talc-based formulation of best effective Trichoderma viride @10 gm/kg seed was found most effective in reducing disease incidence and increasing seed (1157.89 kg/ha), husk (231.94 kg/ha) and swelling factor (14.58%) over rest of treatments.