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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Leaf spots of gummy stem blight are triangular when they occur at the leaf margin Hubbard squash, Cucurbita maxima. Development of two alternative Loop-mediated isothermal amplification tools for detecting pathogenic pine wood nematodes.

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Didymella bryoniae From Bugwoodwiki. Gummy stem blight can be distinguished from cucurbit anthracnose by the larger leaf spots, larger lesions that encircle petioles, and crown cankers. Published 24 October Seeds from healthy fruits are free of the disease but D.

When this pathogen infects the didymslla of cucurbits it is called black rot [2]. Close Find out more. Stems are infected through wounds or mechanical damage 2. In other projects Wikimedia Commons.

Thus, early diagnosis, sensitive and rapid detection of D. An improved real-time PCR system for broad-spectrum detection of Didymella bryoniaethe didymelka agent of gummy stem blight of cucurbits. In addition, research not has to investigate any infected samples under greenhouse or field conditions.


Brgoniae of a loop-mediated isothermal amplification assay for bruoniae and sensitive detection of Sporisorium scitamineum in sugarcane. Factors influencing external fruit rot of cucumber caused by Didymella bryoniae. The reaction mixtures in the microcentrifuge tubes were visually inspected by the naked eye to determine the color change. Hyd5 gene-based detection of the major gushing-inducing Fusarium spp. Seedlings should be inspected regularly for signs of infection as the disease is common at this stage.

Dark globular perithecia are sometimes arranged in rings 1.

Didymella bryoniae – Wikipedia

It takes 7 to 10 days for pseudothecia to produce mature ascospores in culture. Didumella Cucumis melo L. Positive reaction with target DNA. Cankers are light brown to beige to off-white, noticeably lighter in color than foliar leaf spots Fig.

After 3 days, leaves showing suspected early symptoms were collected in greenhouse. The disease was previously an unidentified problem in watermelon didyjella the severe outbreak was associated with favorable weather conditions.

Didymella bryoniae – Bugwoodwiki

Method of diagnosing gummy stem blight in plants using a polymerase chain reaction assay. Didymella bryoniae is common in the Southern U. Spots on cotyledons or true leaves also occur in the greenhouse. This article was submitted to Fungi and Their Interactions, bryonize section of the journal Frontiers in Microbiology.

Note that production of pseudothecia is variable among isolates and between laboratories.

Although the LAMP assays in this study showed high specificity and sensitivity, and showed the highest detection limit so far in the subfemtogram range Niessen,we still need to be cautious because the presence of calcein may inhibit the LAMP reaction and reduce the sensitivity Wastling et al. A positive reaction is indicated by a color change from brown to a yellowish-green color. Stems may be infected by D. Current state and future perspectives of loop-mediated isothermal amplification LAMP -based diagnosis of filamentous fungi and yeasts.


Supplementary Material The Supplementary Material for this article can be found online at: Isolation of single-stranded DNA from loop-mediated isothermal amplification products.

Two pieces cut from an established culture are placed around the edge of the filter paper on the agar, not on the filter paper. Feeding by aphids, striped cucumber beetles, and mechanical wounding provide potential areas of ingress for the pathogen.

Pathogenicity was tested with three isolates from watermelon and one from pumpkin on four 1-month-old plants per watermelon cvs. Host specificity and genetic diversity of Didymella bryoniae from Cucurbitaceae in Brazil. Rapid, specific, simple, in-field detection of Xanthomonas campestris pathovar musacearum by loop-mediated isothermal amplification.

If the cotyledons on inoculated plants are senescent or necrotic, the non-inoculated plants are examined as a reference to distinguish necrosis due to gummy stem blight from natural senescence.