บทคัดย่องานวิจัย

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Distribution of thiabendazole-resistant Colletotrichum musae isolates from Guadeloupe banana plantations.

Lapeyre de Bellaire, L. de; Dubois, C.;

Plant Disease Year: 1997 Vol: 81 Issue: 12 Pages: 1378-1383 Ref: 23 ref.

1997

บทคัดย่อ

Distribution of thiabendazole-resistant Colletotrichum musae isolates from Guadeloupe banana plantations.

In Guadeloupe, anthracnose of bananas, caused by C. musae, is commonly controlled by postharvest thiabendazole treatments. A survey was conducted in 45 banana packing stations of Guadeloupe to determine the proportion of thiabendazole tolerant isolates. Isolates tolerant of thiabendazole concentrations of 1 micro g/ml (R1), 5 micro g/ml (R5) and 50 micro g/ml (R50) were detected. Most of the tolerant isolates were R1 or R5. Of 1350 isolates investigated, the proportion of tolerant isolates (R1 + R5 + R50) was 23%, ranging from 0 to 70% depending on the location. The presence of tolerant isolates was correlated with the exclusive use of benomyl as foliar aerial sprays during 1972-82 to control Sigatoka disease [Mycosphaerella fijiensis]. Isolates tolerant of concentrations of 1 and 5 micro g/ml were as pathogenic as the susceptible isolates, and were not controlled by postharvest thiabendazole treatments. Alternative control measures and the importance of tolerance in C. musae control in Guadelou

pe are discussed.