The effect of seed-borne pathogens on emergence of globe amaranth, calendula and tagetes and the methods of control
Journal
Journal of Phytopathology
Journal Volume
149
Journal Issue
2
Pages
91-96
Date Issued
2001
Author(s)
Abstract
Nimbya gomphrenae , Stemphylium vesicarium and Alternaria tagetica were isolated for the first time from seeds of diseased globe amaranth ( Gomphrena globosa ), pot marigold ( Calendula officinalis ) and marigold ( Tagetes erecta ), respectively, in Taiwan. The amount of seed‐borne N. gomphrenae or Colletotrichum dematium was positively correlated (P=0.05) with the amount of the abnormal seedling and unemergent seed of globe amaranth. Similarly, the amount of seed‐borne Alternaria alternata or S. vesicarium was negatively correlated (P=0.05) with the emergent rate of pot marigold. Treating the fungi‐contaminated globe amaranth seeds with Bacillus megaterium [1.3 × 10 9 colony‐forming units (CFU)/ml] or 1% NaOCl significantly (P=0.05) increased seed emergence over control whereas 10 p.p.m. pyrifenox could control N. gomphrenae on globe amaranth. Stemphylium ‐contaminated pot marigold seeds responded to 200 p.p.m. iprodione treatment by increasing significantly (P=0.05) in seed emergence over untreated control. For seed‐borne A. tagetica , treating marigold seeds with Bacillus azotoformanis (1 × 10 9 CFU/ml) was found effective and mancozeb highly effective.
SDGs
Type
journal article