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来源：百度知道 编辑：UC知道 时间：2024/05/30 21:27:02
1, Strains of Gray Mold pathogens isolated from table grape were classified into 3 groups, EXFG Ⅰ,EXFG Ⅱ and EXFG Ⅲ, based on disease symptoms and morphological characters.
Strains from EXFG Ⅰ and EXFG Ⅱ could sporulate and develop a visible layer of spores on PDA medium 25 ℃ cultivation after 3 days, with a 1×104/cm2 sporulation quantity. After 10-15 days cultivation, sporulation quantity could reach 1×108/cm2.Strains from EXFG Ⅲ need continuous UV radiation to sporulate on PDA in 3-4 days, sporulation quantity could reach 1×103/cm2 after 10-15 days cultivation. EXFG Ⅲ is similar to Typical gray mold pathogen B.cinerea in morphological characters.
2, By compare of the pathogenicity differences in 3 groups,the results show that: all 3 groups cause 90 to 100 percent of berries to drop off table grape after 10 day’s inoculation. EXFG Ⅰhas weaker virulence, and the incidence of infection is low by 5 day’s non - injury inoculation,with 10 day’s illness index amount to 3.3. EXFG Ⅱ

1, Strains of Gray Mold pathogens isolated from table grape were classified into 3 groups, EXFG Ⅰ,EXFG Ⅱ and EXFG Ⅲ, based on disease symptoms exhibited and their specific morphology.
Strains from EXFG Ⅰ and EXFG Ⅱ could sporulate and develop a visible layer of spores on PDA medium 25 ℃ cultivation after 3 days, with a 1×104/cm2 sporulation quantity. After 10-15 days cultivation, sporulation quantity could reach 1×108/cm2.Strains from EXFG Ⅲ need continuous UV radiation to sporulate on PDA in 3-4 days, sporulation quantity could reach 1×103/cm2 after 10-15 days cultivation. EXFG Ⅲ is similar to Typical gray mold pathogen B.cinerea in its morphology.
2, Results of the comparison in the level of pathogenicity in 3 groups have shown that: all 3 groups cause 90 to 100 percent of berries to drop off table grape after 10 days' inoculation. EXFG Ⅰhas weaker virulence, and the incidence of infection is lower by 5 days’ non - injury inoculation,with 10 day’s illness index amoun