STUDY ON INTEGRATED MANAGEMENT OF THE VIRAL DISEASE COMPLEX IN BHUT JOLOKIA (Capsicum chinense Jacq.)

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dc.contributor.advisorKalita, Manoj Kumar
dc.contributor.authorKhaidem, Princy
dc.date.accessioned2024-04-02T11:25:13Z
dc.date.available2024-04-02T11:25:13Z
dc.date.issued2021
dc.description.abstractBhut (Capsicum chinense Jacq.) is one of the important spice crops which is mainly cultivated in the Northeastern region of India. Owing to its traditional importance, pharmaceutical applications, and high commercial value, Bhut Jolokiais getting importance but the production of the crop has been hindering attributable particularly due the infection of a number of viruses. With the growing need for proper management approaches for managing the viruses infecting the crop, a number of management strategies have been studied in the present investigations to manage the viral diseases in Bhut Jolokia. Hot water treatment was given to CMV-infected Bhut Jolokia seeds under different temperature regimes and periods. Thermotherapy was observed to be highly significant in reducing the virus infectivity. Bhut jolokia seeds treated at 50°C for 120 minutes was observed to be the best treatment with minimum disease incidence (26.08%), followed by 55°C for 60 minutes and 55°C for 120 minutes. It was recorded that the virus infectivity gradually reduced at higher temperature with longer exposure period, but, the germination rate was declined. The effect of SAR activating chemicals viz., Salicylic acid (SA), a key signalling molecule triggering plant resistance, and Benzothiadiazole (BTH), an analogue of SA were tested on CMV-infected Bhut Jolokiaseeds to see their effect in the disease incidence. Foliar application of Salicylic acid and Benzothiadiazole at three different concentrations @200, 300 and 400 ppm each was tested where BTH @ 400ppm and SA @ 300 and 400ppm were recorded to be the best among all the treatments displaying less severe symptoms with 55.56 per cent disease reduction over control. Field study was conducted to evaluate the integrated effect of management practices like nursery net cover of seedlings, Benzothiadiazole @ 300 ppm with Biometa @ 5% and neem oil @ 5ml/L; Salicylic acid @ 300 ppm with Biometa @ 5% and neem oil @ 5ml/L; Biometa @ 5% and neem oil @ 5ml/L; Biometa @ 5% and Nuvan @ 1ml/L and sticky traps in different treatment combinations in the management of the viral disease infecting Bhut Jolokia. The plants were observed to be naturally infected by CMV and PVY, ChLCV forming a viral disease complex. DAS-ELISA, RT-PCR, and PCR were used for molecular detection of the viruses. The infected plants exhibited a wide range of symptoms such as severe mosaic, filiform, curling, and crinkling of leaves with a reduction in size, stunted plant growth with bushy appearance, fewer flowers, and deformed fruits were exhibited at later stages of plant growth. Incidence of the viral disease complex of CMV, PVY, and ChLCV ranged from 20.80 to 47.23 percent different treatments. The treatment combination T1 with Net cover of seedlings + Sticky trap +Benzothiadiazole @ 300 ppm at 2-3 leaf stage at 3 days interval for 3 times + Bio-Meta @ 5% at 60, 90 and 120 DAT+ Foliar spray with neem oil @5ml/L at 10 days interval from 30 DAG for 5 times was found to be the most effective treatment by delaying the number of days to the first appearance of symptoms with the lowest disease incidence of 20.80 per cent, maximum yield of 3.22 kg/4.5 m2, and highest benefit-cost ratio of 8.56:1.
dc.identifier.urihttps://krishikosh.egranth.ac.in/handle/1/5810207967
dc.language.isoEnglish
dc.subPlant Pathology
dc.themeSTUDY ON INTEGRATED MANAGEMENT OF THE VIRAL DISEASE COMPLEX IN BHUT JOLOKIA (Capsicum chinense Jacq.)
dc.these.typeM.Sc
dc.titleSTUDY ON INTEGRATED MANAGEMENT OF THE VIRAL DISEASE COMPLEX IN BHUT JOLOKIA (Capsicum chinense Jacq.)
dc.typeThesis
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