บทคัดย่องานวิจัย

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Chemical control of crown rot in Queensland bananas.

Jones, D. R.;

Australian Journal of Experimental Agriculture Year: 1991 Vol: 31 Issue: 5 Pages: 693-698 Ref: 20 ref.

1991

บทคัดย่อ

Chemical control of crown rot in Queensland bananas.

The efficacy of a number of fungicides for control of postharvest crown rot of bananas was assessed on fruit harvested in Oct.-Nov. from north and southeastern Queensland, Australia. Prochloraz and flusilazole were most effective. Prochloraz also reduced disease incidence during storage, and while crown rot levels of water-treated fruit increased during 16 d in storage, levels on prochloraz-treated fruit remained low, and, after a slight initial increase, were constant. All other fungicides tested significantly reduced disease incidence compared with an untreated control: benomyl, propiconazole, imazalil and myclobutanil were less effective than prochloraz and flusilazole (P<0.05), while triforine and hymexazol were least effective. Fusarium pallidoroseum and Verticillium sp. were frequently isolated from diseased crowns of untreated fruit. Pathogenicity of both fungi was confirmed. Both species were sensitive to prochloraz in vitro, but only F. pallidoroseum was sensitive to benomyl. Verticillium sp. was frequently isolated from diseased crowns of benomyl-treated fruit, and it is suggested that the failure of benomyl to control crown rot in Queensland may be due to the presence of benomyl-tolerant crown rot fungi in banana plantations. Other fungi isolated from diseased crowns were: Penicillium corylophilum, Alternaria triticina, Cladosporium oxysporum, Acremonium sp., Fusarium spp., Bipolaris sp. and Eupenicillium sp.