Host plants and pathogen race of Fusarium oxysporum F. sp. Vasinfectum
1998
Perpetua, N.S. | Monares, D.P. (Cotton Research and Development Inst., Sulit, Polomolok, 9504 South Cotabato (Philippines))
The host plants and pathogenic race of Fusarium oxysporum f. sp. vasinfectum (Fov) causing Fusarium wilt of cotton was determined under screen house condition. Seven isolates of Fov were collected from cotton production areas of Polomolok, South Cotabato and General Santos City. Isolates from Polomolok, were designated as SC1 and SC2 while five isolates from General Santos City were designated as GSC1 (Conel), GSC2 (Klinan 5), GSC3 (Mabuhay), GSC4 (New Mabuhay) and GSC5 (Conel). Eight crops namely: mungbean, cowpea, stringbean, peanut, corn, saluyot, sweet pepper, okra and three weed species: goose grass, itch grass and spiny amaranth were tested as hosts of Fov. Cotton served as control. Infection was only observed at the hypocotyl of the leguminous crops, sweetpepper and corn. Saluyot was severely infected with all isolates from GSC. Okra was found to be very susceptible to all Fov isolates. No or limited infection in the hypocotyl was observed in weed species tested. Using a differential set of cotton cultivars, all isolates of Fov collected from Polomolok, South Cotabato and General Santos City showed a similar pathogenic reaction to race A of the pathogen
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