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Author: Achari, Raghavendra × Start date: 1961 × Type: Thesis × Thesis Type: M.Sc ×
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    ThesisItemOpen Access
    STATUS AND MANAGEMENT OF PAPAYA RINGSPOT VIRUS DISEASE IN NORTHERN KARNATAKA
    (UNIVERSITY OF AGRICULTURAL SCIENCES GKVK, DHARWAD, 2003) Achari, Raghavendra; Benagi, V I
    "Papaya is one of the important fruit crops of Karnataka. Among the biotic stresses, ringspot virus disease is a major disease of papaya. Roving survey conducted during November- December 2002 in Northern Karnataka revealed, maximum severity of the disease in Kallur of Gulbarga disttict (98.00%) and minimum in Menajgi of Gulbarga district (43.20%). Various sym|iloms like mosaic pallcrn, chlorosis, siioeslringing, blistering and vein clearing of leaves and streaks on petiole along with ringspot, oily spot and distortion of fruits were noticed among the fields surveyed. Disease significantly reduced both physiological and quality parameters of papaya. lvings|-)ol \irus infection retluced chlorophyll 'b' (72.80%o) drastically as compared to clilorophyli -.r (.^3.80%)) and total chlorophyll (47.70'!o). Quality parameters like tola! soluble was solids rcchi-.cd by 24.92'/o, reducing s\igar by 41.41%, non-reducing sugar by 35.69%i, total ;;!igar b\"" 3.^.28%; and papain content by 3().45%o of fruit in infected ones. Fruit length was reduced by 25.67% and fruit girth by 20.51% as a result of ringspot virus infection. (iroundiiut oil, micionutrients, azadirachtin and insecticides alone and in combinations weie e\;ilu.i!od lor (heir criicacy (o manage Ibc disease untler field condition. Trcaimnil includiti!.' g.r'Uiv.'nu! oil, micronulrienls, azadirachtin and insecticides spray recorded more nunibei of nui!i::ip leaves (36.67) per plant and minimum number of mosaic (3.56) and malformed leaves (1.78) and petioles with oily streaks (12.78) per plant. Treatment including groundnut oil, niicronutrients and insecticides spray recorded more number of normal Iruit (16.78) per plant. The number of ringspot (3.78) and oily spot fruit (1.00) per plant and diseased fruits in apical ten fruits (1.78) per plant were recorded minimum in treatment where gronndiuit oil, microniKrients. azadirachtin and insecticides sprays were imposed."