ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

Management of silver scurf (Helminthosporium solani) with fungicide seed treatments and storage practices.

Frazier, M. J.; Shetty, K. K.; Kleinkopf, G. E.; Nolte, P.;

American Journal of Potato Research Year: 1998 Vol: 75 Issue: 3 Pages: 129-135 Ref: 26 ref.

1998

บทคัดย่อ

Thiabendazole insensitive strains of H. solani, the causal agent of silver scurf, make controlling the disease with seed treatment difficult. Potato tuber seed treatments and environmental storage management practices were investigated in Idaho, USA. Fungicide seed treatments were evaluated during the growing season, at harvest, and after 5 months of storage. Silver scurf was observed on progeny tubers 11 weeks after planting. Fungicides that reduced disease incidence and severity on the seed resulted in reduced disease in the progeny tubers at harvest, and in significantly lower disease ratings after storage. Only small increases in disease incidence (0-8%) occurred after storage. Thiophanate-methyl + mancozeb, captan + mancozeb, and fludioxonil were the most effective treatments for reducing disease on seeds and in progeny tubers (incidences on progeny tubers at harvest for these 3 treatments were 3, 9 and 8%, respectively). Thiophanate-methyl alone was not effective for disease control. Envir

onmental conditions in storage affected disease development. Reduced humidity (85%) during the curing period (0-3 weeks after harvest) significantly reduced (11%) diseased surface area of tubers. Free moisture on the tuber surfaces during storage significantly increased (15%) infection. H. solani survived in soil and on some potato storage building materials for up to 9 months. It is concluded that H. solani can be suppressed on potatoes by using effective seed treatment and storage management.