Disease. Gummy stem blight. Causes leaf spot, stem canker, black leaf and fruit rot; common name refers to the characteristic gummy exudate. Didymella bryoniae (Auersw.) Rehm [anamorph Phoma cucurbitacearum (Fr.) Sacc.] is the causative agent of gummy stem blight (GSB), a disease affecting. Gummy stem blight of cucurbits produces a variety of symptoms which are referred to as leaf spot, stem canker, vine wilt and black fruit rot. Lesions on leaves.

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However, use of DNA-binding dyes increases the rates of cross-contamination because of the open cover operation Notomi et al. The following list is arranged in an approximate order of susceptibility to both the foliar blight and canker phases of gummy stem blight, starting didymellw the species that are the most susceptible: To distinguish both genotypes of D.

From native plants in central Europe to cultivated crops worldwide The emergence of Didymella bryoniae as a cucurbit pathogen. Notes on three new or noteworthy diseases of plants.


Published 24 October Spots on stems often elongate into streaks usually starting at the joints and have an amber difymella of gummy material.

Didymella bryoniae – Wikipedia

Regular benzimidazole fungicide applications can control this pathogen, but certain D. Pathogen Gummy stem blight and black rot are caused by the ascomycete fungus Didymella bryoniae Auersw.

Host specificity and genetic diversity of Didymella bryoniae from Cucurbitaceae in Brazil. Infection also occurs on seedlings. This method has potential application in early prediction of disease and reducing the risk of epidemics. The reaction mixtures in the microcentrifuge tubes were visually inspected by the naked eye to determine the color change. Didymella bryoniae Fuckel Rehm, Didymella bryoniae causes the cucurbit-rot disease known as gummy stem blight or black rot.

Gummy stem blight – also known as black rot or alligator skin. Fruit rots of pumpkin: On squash and pumpkin, old leaf spots may shred or tear Fig. Detection of Puccinia kuehnii causing sugarcane orange rust with a loop-mediated isothermal amplification-based assay. No use, distribution or reproduction is permitted which does not comply with these terms. Factors influencing external fruit rot of cucumber caused by Didymella bryoniae.

On fruit, dark cracked sunken lesions form, beneath which an extensive rot is found.


Highlights of the Didymellaceae: Walker, Mycosphaerella melonis Pass. Development of a loop-mediated isothermal amplification assay for rapid and sensitive detection of Sporisorium scitamineum in sugarcane. One-quarter-strength potato dextrose agar is preferred over full strength medium, because D. LAMP detection of D. When this pathogen infects the fruit of cucurbits it is called black rot [2].

Disease Gummy stem blight. Views Read Edit View history. Thus, seedling health testing is a central issue for a large nursery. Compendium of Cucurbit Diseases, T. Although beyoniae exudate gives the disease its common name, the presence of this symptom is not diagnostic; stem injuries can provoke a similar host response.

However, the use of a real-time turbidimeter is not applicable in rural areas of developing countries. The taxonomic treatment of the genus Didymella by Corlett includes a useful summary of primary literature 6. Dixymella can be observed as soon as one week after spore germination on susceptible tissue 1.

All isolates infected both hosts.