Virulence, Variation and Survival of colletotrichum Falcatum Went in Kerala
By: Babu George.
Contributor(s): Wilson K (Guide).
Material type:
BookPublisher: Vellayani Department of Plant Pathology, College of Agriculture 1989DDC classification: 632.3 Online resources: Click here to access online | Click here to access online Dissertation note: PhD Abstract: Eleven ‘light type’ isolates of colletotrichum falcatum went from four common sugarcane varieties cultivated at different locations in Thiruvalla region were employed in the present study.
The conidia of isolates I and XI were longer than most of the other isolates. Isolate VII produced shorter but broader conidia than the other isolates. Oat meal and potato dextrose agar media were found very good for the growth of all the isolates. Maximum sporulation of most of the isolates was obtained in oat agar medium.
Fructose, mannitol and sucrose supported very good growth of all the isolates. Abundant sporulation was obtained in the presence of glucose, mannitol and sucrose. Sodium nitrate favoured fairly good growth and sporulation of all the isolates. Tyrosine used as amino nitrogen source aided good growth and sporulation by most of the isolates. Maximum mycelial growth and best sporulation of all the isolates were obtained when grown at pH 7.0.
Isolate I was found to be more virulent than the other 10 isolates when tested against 13 differential varieties of sugarcane. One hundred and five varieties were susceptible and ninety five were resistant to isolate I of the pathogen when tested in the field. The susceptible varieties included Co.997, Co.449, Co.419, Co.785 and Co.62175 commonly cultivated in the region and Co.7704 recently recommended for cultivation.
Serological studies indicated that isolate I was not identical to the other 10 isolates and the one from karnal.
The disease could be transmitted to the ratoon crop from severely affected stumps of a susceptible variety. The pathogen remained viable up to 8 weeks on infected sugarcane pieces buried at five and ten cm depths in soil. The propagules of the funges were able to survive up to four weeks in water collected from Manimala river.
| Item type | Current location | Call number | Status | Date due | Barcode |
|---|---|---|---|---|---|
Theses
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KAU Central Library, Thrissur Theses | 632.3 BAB/VI (Browse shelf) | Available | 170213 |
PhD
Eleven ‘light type’ isolates of colletotrichum falcatum went from four common sugarcane varieties cultivated at different locations in Thiruvalla region were employed in the present study.
The conidia of isolates I and XI were longer than most of the other isolates. Isolate VII produced shorter but broader conidia than the other isolates. Oat meal and potato dextrose agar media were found very good for the growth of all the isolates. Maximum sporulation of most of the isolates was obtained in oat agar medium.
Fructose, mannitol and sucrose supported very good growth of all the isolates. Abundant sporulation was obtained in the presence of glucose, mannitol and sucrose. Sodium nitrate favoured fairly good growth and sporulation of all the isolates. Tyrosine used as amino nitrogen source aided good growth and sporulation by most of the isolates. Maximum mycelial growth and best sporulation of all the isolates were obtained when grown at pH 7.0.
Isolate I was found to be more virulent than the other 10 isolates when tested against 13 differential varieties of sugarcane. One hundred and five varieties were susceptible and ninety five were resistant to isolate I of the pathogen when tested in the field. The susceptible varieties included Co.997, Co.449, Co.419, Co.785 and Co.62175 commonly cultivated in the region and Co.7704 recently recommended for cultivation.
Serological studies indicated that isolate I was not identical to the other 10 isolates and the one from karnal.
The disease could be transmitted to the ratoon crop from severely affected stumps of a susceptible variety. The pathogen remained viable up to 8 weeks on infected sugarcane pieces buried at five and ten cm depths in soil. The propagules of the funges were able to survive up to four weeks in water collected from Manimala river.
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