บทคัดย่องานวิจัย

หมวดหมู่ : ฐานข้อมูลงานวิจัย

Resistance to thiabendazole in Fusarium species and Helminthosporium solani in potato tubers treated commercially in eastern Canada.

Platt, H. W.;

Phytoprotection Year: 1997 Vol: 78 Issue: 1 Pages: 1-10 Ref: 10 ref.

1997

บทคัดย่อ

Resistance to thiabendazole in Fusarium species and Helminthosporium solani in potato tubers treated commercially in eastern Canada.

During the 1992-93 and 1994-95 potato winter storage period in Quebec, New Brunswick, and Prince Edward Island, tubers were collected which had symptoms of Fusarium rot and silver scurf and which had been treated commercially after harvest with thiabendazole. Tolerance of thiabendazole was detected in isolates of F. sambucinum [Gibberella pulicaris] and Helminthosporium solani, but not in isolates of F. avenaceum [G. avenacea] and F. oxysporum. However, the majority of the farms surveyed (64%) had adequate disease control with no pathogen isolated from the diseased tubers. Incidence and EC50 values of tolerant isolates were lower than those found elsewhere and the occurrence of farms with tolerant isolates of G. pulicaris (18%) was greater than that for H. solani (7%). For H. solani, EC50 values of tolerant isolates were substantially lower than those found in Alberta. While the study investigated commercial operations employing a wide range of thiabendazole rates (6-42 g a.i./t), no specific tr

ends were detected between the occurrence of tolerant isolates and cultivar or thiabendazole application rate.