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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Pale colored pycnidia are ridymella in closely spaced groups. Flowers and fruits of both hosts developed black rot spots and aborted. Black rot on watermelon appears as a large, expanding rot that starts at the blossom end of the fruit Fig.

In the field the first symptoms may be plant collapse where sunken, girdling cankers lead to total loss. The bryomiae study did not involve endangered or protected species. Symptoms of black rot vary with host species and horticultural type.

As soon as the colony has covered the filter paper circle, the filter paper is removed with sterile forceps, placed into a sterile, covered Petri dish, and left in an operating laminar flow hood for 3 to 5 days. Development of a loop-mediated isothermal didyme,la assay for rapid and sensitive detection of Sporisorium scitamineum in sugarcane. The same results were obtained in all three replicates.

Didymella bryoniae

The standard management practice for D. Under these temperature and light conditions, pycnidia and conidia typical of D. The centers of anthracnose leaf spots are more likely to dissolve bryiniae centers of leaf spots of gummy stem blight. The first symptoms appear as grayish green, circular spots between the veins of the leaf lobes [1].


On the fruit, spots appear irregularly circular and yellowish. Consequently, it is worth emphasizing that the advantages offered by this LAMP assay provide a robust, visual, and easy-to-perform approach for detecting D. Further development can lead to bark scaling and cracking in cucurbit vines didymeella the collar region of watermelon.

In addition, although the developed LAMP assay showed high sensitivity and broad-spectrum detection of D. Ideal ascospore dispersal occurs after nightly rainfall and dew periods [2].

Didymella bryoniae – Bugwoodwiki

Conflict of Interest Statement The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

While viewing the plate through a dissecting microscope with subsurface illumination, a tiny piece of agar that includes only an individual conidium and bryoniiae germ tube is cut out and placed onto one-quarter-strength potato dextrose agar.

Gummy stem blight can occur on seedlings of watermelon, muskmelon, and other cucurbits grown in greenhouses for use as transplants 11, However, the use of a real-time turbidimeter is not applicable in rural areas of developing countries. In addition to the six commonly cultivated cucurbit species listed above, foliar or crown lesions and black rot have been reported on bitter melon also known as balsam pear Momordica charantiabottle gourd Lagenaria sicerariasmooth loofah Luffa cylindricaand chayote also known as didynella pear Sechium edule 2,14,22, With sterile forceps and sterile scissors, the dry filter paper is cut into 0.

Pathogenicity was tested with three isolates from watermelon and one from pumpkin on four 1-month-old plants per watermelon cvs. There is considerable variation didymelpa fruit susceptibility to black rot within C. From native plants in Central Europe to cultivated crops worldwide: Differential sensitivity to boscalid in conidia and ascospores of Didymella bryoniae and frequency of boscalid-insensitive isolates in South Carolina.


Pathogen Gummy stem blight and black rot are caused by the ascomycete fungus Didymella bryoniae Auersw.

A serious threat to the pumpkin industry. Discussion Gummy stem blight caused by D. Conidia are produced on the lesion sites of leaves and stems.

Didymella bryoniae – Wikipedia

Morphological, pathological, and genetic differentiation of Didymella bryoniae and Phoma spp. Open in a separate window. The most common methods currently used for the rapid detection of D. Cultures on filter paper will remain viable up to 10 years. The emergence of Didymella bryoniae as a cucurbit pathogen. This article has been cited by other articles in PMC. Development of two alternative Loop-mediated isothermal amplification tools for detecting pathogenic pine wood nematodes.

Water-soaking may also be visible on the leaf underside on main veins that pass through lesions. Seven other fungal pathogens of Cucurbitaceae crops were collected from muskmelon, watermelon, and gourd from Jiangsu province, and an Ascochyta pinodes isolate was obtained from a pea plant at Zhejiang province.

Privacy policy About Bugwoodwiki Disclaimers. Diagnostic signs are the pycnidia and pseudothecia of the pathogen that form readily in leaf spots and in lesions on other above-ground plant parts, including petioles, vines, stems, tendrils, and pedicels of flowers and fruit Figs. This page was last modified To obtain a pure culture from a single conidium, a 3-mm-square piece is cut from an area of the colony with pycnidia, taking care to avoid other microorganisms if an isolation plate is used as the source.