SUMMARY Carbendazim applied at the rate of 2 g per plant to the roots of tobacco (Nicotiana tabacum cv. White Burley) plants before infection with tobacco mosaic virus (TMV) caused very considerable reduction in the severity of disease symptoms in systemically infected leaves but did not affect their virus content. Leaves of untreated, infected plants had a greatly reduced chlorophyll content 100 days after infection whereas the chlorophyll content of leaves of infected plants treated with carbendazim was similar to that of normal uninfected leaves. Carbendazim had no effect on the infectivity of TMV in vitro or on the local lesion reaction of N. glutinosa plants when inoculated with TMV. Carbendazim was applied to lettuce cv. Cobham Green at a total rate of o-i g per plant before and after they were infected with beet western yellows virus and the plants were then grown on in the field. At harvest time (50 days after infection) almost all the treated virus-infected plants were of a normal green appearance, whereas the untreated controls were almost all very severely yellowed and unmarketable.

中文翻译：

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两种病毒病症状的化学抑制

总结 在感染烟草花叶病毒 (TMV) 之前，将多菌灵以每株植物 2 g 的比例施用于烟草 (Nicotiana tabacum cv. White Burley) 植物的根部，可显着降低系统感染叶片的疾病症状严重程度，但不影响他们的病毒内容。感染后 100 天，未经处理的感染植物叶子的叶绿素含量大大降低，而用多菌灵处理的感染植物叶子的叶绿素含量与正常未感染叶子的叶绿素含量相似。多菌灵对TMV的体外感染性或接种TMV时对N. glutinosa植物的局部病变反应没有影响。多菌灵应用于生菜 cv。Cobham Green 在它们感染甜菜西部黄病毒之前和之后以每株植物总 oi g 的比例添加，然后植物在田间继续生长。在收获时（感染后 50 天），几乎所有处理过的受病毒感染的植物都具有正常的绿色外观，而未处理的对照几乎都非常严重地泛黄且无法销售。