![]() ![]() Īerial mycelium (usually absent, very scanty), submerged mycelium (hyaline to brown), pycnidia (sporulation heavy), perithecia (no sporulation) ![]() The colony surface was rough and undulated, the conidia were round-ended, cylindrical, monoseptate, and hyaline. White aerial and olivaceous mycelium, and olive to dark green or black substrate mycelium Īngular water-soaked lesions, defoliation, dry, stem necrosis, gummy exudates, wilt and eventual death Produced a conidial mass with a white aerial mycelium at The center of colony, few pycnidia were observed. ĭry rot in stems (white), leaf spots and dry rot in petiols (dark brown). Pycnidia (sporulation aparse), perithecia (black bodies). Irregular dark brown lesions at the leaf margin Īerial mycelium (white becoming gray with age), submerged mycelium (dark olive to black) Morphological and cultural characters of pathogenic bacteria on Cucurbits. bryoniae on Cucurbitaceous plants, which could help establish an efficient prevention and control method to reduce the incidence rate of GSB. To date, few studies have been conductedon the epidemiological aspects of D. Meanwhile, the host of the pathogen is widely distributed, and its structure is complicated and diverse therefore, it is not easy to control this disease. The disease can occur in each growth stage of Cucurbits, and it can infect and damage different parts of Cucurbits, including leaves, petioles, vines, stems, tendrils, pedicels, flowers, peduncles, fruits, and seeds. Of particular interest is pathogenic development within vinyl house, heliogreenhouse facilities. The occurrence of GSB is intensified by warm, humid, semi-tropical, and tropical environments that are conducive to the germination of the spores and disease development. melo L.), and gourds ( Lagenaria siceraria (Molina) Standl). This pathogen has been reported on six continents with at least 12 genera and 23 species of Cucurbitaceae, including watermelon ( Citrullus lanatus), cucumber ( Cucumis sativus L.), pumpkins ( Cucurbita spp.), cantaloupe ( Cucumis melo var. Recentreports of this fungal pathogen have arisen from several countries including India, Thailand, China (including the Taiwan region), the United States, Trinidad, Brazil, Egypt, Tanzania, Turkey, Tunisia, Iraq. Gummy stem blight (GSB), caused by the fungal pathogen Didymella bryoniae, is the most prevalent and devastating fungal disease on Cucurbitaceous vegetable crops. ![]()
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