Using pencycuron: Study on processing tomato seeds and seeds disinfection treatment

By: YANG Hua,CUI Yuan-yu,SUN Xiao-jun, SUN Xi-liang, TAN Xin-hua,MA Chang-min Pathogens carried on the seeds of 7 varieties of processing tomato were isolated and identified, and 5 fungicides/disinfectants were tested for their potential use as seed disinfectant. The major pathogens carried on the surface of seeds were two bacteria:Corynespora cassiicola and Xanthomonas campestyis,with percentage infection of 0.8%～10.8% and 0～14.2%, respectively .Other pathogens carried on seed surface were fungi, including species of Fusarium, Rhizoctonia , Alternaria, etc, with lower infection compared with bacteria . These becteria and fungi also existed in the seeds, and exhibited a great variation among tomato varieties . In the laboratory, coating seed with 47%, pencycuron WS (0.2 kg product per 100 kg seed ) or 2.5%Celest FS (0.5 kg product per 100 kg seed) ,or soaking seeds with 200 x or 250 x potassium permanganate solution gave best result of seed coating with Monceren and Celest in effectively controlling the diseases caused by these pathogens.

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