In 2010, a foliar and stem-lesion disease that produced moderate to severe defoliation of watermelon was observed in the southern Great Plains. The disease was ultimately determined to be caused by Myrothecium roridum...In 2010, a foliar and stem-lesion disease that produced moderate to severe defoliation of watermelon was observed in the southern Great Plains. The disease was ultimately determined to be caused by Myrothecium roridum. The objective of this study was to compare the susceptibility of the vegetation and fruit of a broad range of commercially important cucurbits to three isolates obtained from these foliar lesions on watermelon. In greenhouse foliar inoculation experiments, cantaloupe, honeydew, cucumber, squash, and watermelon were susceptible to the fungus with cantaloupe and honeydew being the most susceptible and watermelon the most resistant. Furthermore, greenhouse inoculations supported earlier field observations as differential resistance was exhibited among the watermelon cultivars as well as the cucurbit types. All tested cucurbit fruit exhibited interior lesions when inoculated sub-epidermally with M. roridum isolates. However, natural infection of watermelon and pumpkin fruit has never been reported.展开更多
A new leave disease of tomato(Lycopersicon esculentum Miller) was observed in polyethylene film-covered greenhouse in Beijing,China.This disease spreaded rapidly in the greenhouse and caused serious loss of the produc...A new leave disease of tomato(Lycopersicon esculentum Miller) was observed in polyethylene film-covered greenhouse in Beijing,China.This disease spreaded rapidly in the greenhouse and caused serious loss of the production of tomatoes.In the study,a fungal strain isolated from the lesion was confirmed to be pathogen for this new disease,and identified as Myrothecium roridum Tode ex Fr.based on the morphology,cultural characters on PDA plate and sequence analysis of ribosomal DNA-ITS.This is the first report of myrothecium leaf spot on tomato occurring in commercial greenhouse in China.展开更多
文摘In 2010, a foliar and stem-lesion disease that produced moderate to severe defoliation of watermelon was observed in the southern Great Plains. The disease was ultimately determined to be caused by Myrothecium roridum. The objective of this study was to compare the susceptibility of the vegetation and fruit of a broad range of commercially important cucurbits to three isolates obtained from these foliar lesions on watermelon. In greenhouse foliar inoculation experiments, cantaloupe, honeydew, cucumber, squash, and watermelon were susceptible to the fungus with cantaloupe and honeydew being the most susceptible and watermelon the most resistant. Furthermore, greenhouse inoculations supported earlier field observations as differential resistance was exhibited among the watermelon cultivars as well as the cucurbit types. All tested cucurbit fruit exhibited interior lesions when inoculated sub-epidermally with M. roridum isolates. However, natural infection of watermelon and pumpkin fruit has never been reported.
文摘A new leave disease of tomato(Lycopersicon esculentum Miller) was observed in polyethylene film-covered greenhouse in Beijing,China.This disease spreaded rapidly in the greenhouse and caused serious loss of the production of tomatoes.In the study,a fungal strain isolated from the lesion was confirmed to be pathogen for this new disease,and identified as Myrothecium roridum Tode ex Fr.based on the morphology,cultural characters on PDA plate and sequence analysis of ribosomal DNA-ITS.This is the first report of myrothecium leaf spot on tomato occurring in commercial greenhouse in China.
