Consideracoes gerais sobre as enfermidades do cacaueiro na Amazonia
To attend the basic program of cacao crop in Amazonia, observations and research on cacao diseases were started by CEPLAC in 1970. The economic importance and periods of high incidence of cacao diseases were evaluated, basing on "witches' broom" (M. perniciosus) and on Black-pod (P. palmivora) observations. To "witches' broom" indicated a high incidence during February and November while Black-pod occured normaly between the end of March and beginning of April. To control these diseases, use of resistant plants are needed. Screening of resistant material was carried out. Inoculations trials were performed with M. perniciosus in seeds from several crosses between clones and local types with Sca-6, the latter being considered as a source of resistance. Although the results are preliminary, the methodology to assess the resistance has been improved. Studies on P. palmivora variation showed that at least three "strains" occur in the region; one of them is virulent to Sca-6. Systemic fungicides such as Plantvax and Vitavax, were considered for controlling "witches' broom" in preliminary trials. Application of cuprous oxide at 3 per cent, during January, May and June, and at 4 per cent during February and March, were recommended for the control of Black-pod. The occurrence of P. palmivora along with nematodes, Dolychodorus and Meloidogyne were found in the nursery. The nematodes were easily controlled by soil fumigation with Basamid at 200 g/m3 of soil. Corticium salmonicolor and C. koleroga causing diseases are of rare occurrence in the lower Amazonas and are easily controlled
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| Format: | biblioteca |
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1973
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| Subjects: | THEOBROMA CACAO, PHYTOPHTHORA PALMIVORA, PODREDUMBRES, EPIDEMIOLOGIA, ENFERMEDADES FUNGOSAS, CRINIPELLIS PERNICIOSA, CORTICIUM SALMONICOLOR, KOLEROGA NOXIUS, AMAZONIA, BRASIL, |
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