Murcha do algodoeiro

Viégas, A. P.

doi:10.1590/S0006-87051961000100017

Resumos

A murcha do algodoeiro, causada por Fusarium oxysporum f. vasinfectum foi constatada em Presidente Prudente, Estado de São Paulo. O fungo foi isolado de hastes c inoculado em mais de 60 variedades do plantel do Instituto Agronômico. Sementes destas variedades, depois de deslintadas com ácido sulfúrico, desinfetadas, em hipoclorito de cálcio (8), foram plantadas em tubos com solução de Hoagland solidificada pela adição de ágar. Cêrca de 10 variedades se mostraram promissoras para trabalhos dc melhoramento. De sementes colhidas de plantas afetadas pela murcha no campo, foram feitos plantios em ágar de batatinha e dextrose para saber se levavam o patógeno internamente na semente. Presume-se que em 6 por mil dos casos, o Fusarium oxysponon f. vasinfectum vai associado às partes vivas das sementes de algodão. Nos Estados Unidos a porcentagem oscila entre 0.74- 6% (2, 4, 5, 6. 19, 20, 33).

Wilt of cotton caused by Fusarium oxysporum f. vasinfectum was found at Presidente Prudente, State of São Paulo. More than 60 varieties from collections maintained by the Cotton Department of the instituto Agronômico were tested for suscetibility when grown artificially in large test tubes in Hoagland's solution made solid by addition of agar. Ten varieties promised to be good material in a first screening. From sulphuric acid delinted cotton seeds followed by washing and desinfestation by calcium hypochoride, Fusarium oxysporum f. vasinfectum. (32) was isolated from what it is bellieved to be living internal tissues of seeds obtained from wilted plants in the field. Six out of a thousand seeds tested carried consistently the fungus. In the States from the work, by Elliott (19, 20) and later by Taubenhaus and Ezekiel (33) higher percentages were secured when they investigated the problem.

Dr. A. P. Viégas

Engenheiro-agrônomo, Seção de Fitopatologia, Instituto Agronômico

RESUMO

A murcha do algodoeiro, causada por Fusarium oxysporum f. vasinfectum foi constatada em Presidente Prudente, Estado de São Paulo. O fungo foi isolado de hastes c inoculado em mais de 60 variedades do plantel do Instituto Agronômico. Sementes destas variedades, depois de deslintadas com ácido sulfúrico, desinfetadas, em hipoclorito de cálcio (8), foram plantadas em tubos com solução de Hoagland solidificada pela adição de ágar. Cêrca de 10 variedades se mostraram promissoras para trabalhos dc melhoramento.

De sementes colhidas de plantas afetadas pela murcha no campo, foram feitos plantios em ágar de batatinha e dextrose para saber se levavam o patógeno internamente na semente. Presume-se que em 6 por mil dos casos, o Fusarium oxysponon f. vasinfectum vai associado às partes vivas das sementes de algodão. Nos Estados Unidos a porcentagem oscila entre 0.74- 6% (2, 4, 5, 6. 19, 20, 33).

SUMMARY

Wilt of cotton caused by Fusarium oxysporum f. vasinfectum was found at Presidente Prudente, State of São Paulo. More than 60 varieties from collections maintained by the Cotton Department of the instituto Agronômico were tested for suscetibility when grown artificially in large test tubes in Hoagland's solution made solid by addition of agar. Ten varieties promised to be good material in a first screening.

From sulphuric acid delinted cotton seeds followed by washing and desinfestation by calcium hypochoride, Fusarium oxysporum f. vasinfectum. (32) was isolated from what it is bellieved to be living internal tissues of seeds obtained from wilted plants in the field. Six out of a thousand seeds tested carried consistently the fungus. In the States from the work, by Elliott (19, 20) and later by Taubenhaus and Ezekiel (33) higher percentages were secured when they investigated the problem.

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LITERATURA CITADA

Recebido para publicação em 11 de fevereiro de 1961

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