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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A taxonomic survey of some species of Didymella and Didymella -like species. Optimal LAMP reaction components and conditions were used as described earlier. In A,Blane 1: This is to ensure that we give you the best experience possible. Knowledge Bank home Change location. Simultaneous detection of Acidovorax avenae subsp. In the older bryojiae, Mycosphaerella melonis Pass.
In latter periods of growth, the mycelium is an olive to dark green or black color . Certain Cucurbita species are resistant to D. From native plants in Central Europe to cultivated crops worldwide: Black rot on watermelon xidymella as a large, expanding rot that starts at the blossom end of the fruit Fig. Disease incidence is determined for each pot, although normally all seedlings are infected Fig.
Spots may have gummy exudates at the center that eventually turn to a black rot. The pycnidia, whether on fruit, stem, or leaf, are closely spaced groups of the dark brown to black fruiting bodies, just large enough to be seen without a hand lens.
Gummy stem blight symptoms affect all above-ground vegetative difymella reproductive parts of cucurbits, including leaves, petioles, vines, stems, tendrils, pedicels, flowers, peduncles, fruit, and seed 5, Loop mediated isothermal amplification LAMP: Published online Aug Fungal and Culture Conditions Five D. Bacillus subtilis is available for use as a biological control agent against D.
When this pathogen infects the bryonoae of cucurbits it is called black rot . Pathogenicity was tested with three isolates from watermelon and one from pumpkin on four 1-month-old plants per watermelon cvs.
Wild hop also known as white bryony Bryonia alba is susceptible to gummy stem blight; B.
The main characteristic features are the gummy exudate on stem and fruit lesions, bryonie the abundant pycnidia followed by perithecia. Didymella bryoniae is common in the Southern U.
Pale colored pycnidia are found in closely spaced groups.
Plant Disease Management Reports. Fruiting bodies of D. Sugar Baby and Charleston Grey and pumpkin cv. The LAMP reaction was performed in 0. Sexual and asexual fruiting bodies are visible on the same lesions of the leaves, stem, and fruits.
gummy stem blight of cucurbits (Didymella bryoniae)
AFLP analysis of a worldwide collection of Didymella bryoniae. The disease is caused by the ascomycete Didymella bryoniae Fuckel Rehm [anamorph Phoma cucurbitacearum Fr. The fruit of butternut squash, jack-o-lantern pumpkin, ornamental gourds, muskmelon, and greenhouse cucumber are the most susceptible 3,23,26, These results verified the potential field use of the LAMP assay.
Fruiting bodies form readily when diseased tissue is placed in a simple humidity chamber made from a moist paper towel and a self-sealing polyethylene bag and held overnight at ambient temperature and lighting. Dark mycelium bdyoniae fruiting bodies of Didymella bryoniae 3 days after culturing from a leaf spot on watermelon onto one-quarter-strength potato dextrose agar.