![]() KOR-33, J-3, and JMu-15 were also regarded as highly resistant.Īll of the accessions identified as resistant were C. Through this screening system, MEX-2 was confirmed as the accession having the highest resistance to the gummy stem blight pathogen. Characteristic Symptoms: Leaf spots, mostly on leaf edges are light brown and expand to the center of the leaf usually forming a V- or U-shape lesion. bryoniae isolates, and then confirming screen with more severe temperature conditions) was employed. Gummy stem blight is a serious disease of greenhouse cucumber in The Netherlands, where it causes fruit rot (black rot) (Punithalingam and Holliday, 1972 Van Steekelenburg, 1985a). Advanced external symptoms of gummy stem blight. Internal discolouration and rotting of fruit due to gummy stem blight. Narrowing of blossom end of fruit due to gummy stem blight infection. In order to identify accessions having high resistance, a three-step screening system (initial screen, secondary screen with two other D. gummy stem blight on cucumber is second only to those of root knot nematode in North Carolina (St. Stem cracks, amber-coloured gummy droplets and tiny black spore-producing bodies at base of cucumber stem. Subsequently, disease damage was evaluated based on stem symptoms. bryoniae using a petiole-mediated inoculation method. Evolutionary history and variation in host range of three Stagonosporopsis species causing gummy stem blight of cucurbits. Bailey) Mansf., for resistance to gummy stem blight. We tested all the available accessions from the USDA-ARS watermelon germplasm collection, including C. ![]() Seedlings were inoculated with three isolates of D. Colletotrichum orbiculare on the surface and interior of cucumber seeds. Plant breeders need sources of resistance that can be incorporated into adapted breeding lines to help control the disease. agrestis (weedy type melon), and other types. ![]() These results can provide a good base for further study and molecular markers for fine-mapping the major QTL conferring GSB resistance in cucumber.Seedling screens of melon ( Cucumis melo) for high resistance to gummy stem blight, caused by the fungus Didymella bryoniae (Auersw.) Rehm, were conducted on 180 accessions of C. There were 102 candidate genes predicted in the region harboring the stable QTL gsb5.1, of which seven genes were related to disease resistance. Locus gsb5.1 accounted for the highest phenotypic variation, 17.9%, and was flanked by SSR15321 and SSR07711 within the genetic distance of 0.5 cM. The stem of transplants same may show water soaking. Disease symptoms are often visible before and after transplanting in the field. The disease can cause significant production losses during warm and wet conditions. The stable locus gsb5.1 on Chr.5 was repeatedly detected in three seasons. Gummy stem blight affects all cucurbits, but in Florida, it is seen more as issue in watermelon and cantaloupe. Six QTLs, gsb3.1, gsb3.2, gsb3.3, gsb4.1, gsb5.1, and gsb6.1, for resistance to GSB in cucumber seedlings were detected. Effect of seed treatment with Crude Proteins (CP) from PGPF (MRS-PGPF 24) on muskmelon gummy stem blight disease protection under green house conditions: The. Genetic analysis indicated that the resistance to GSB in PI 183967 seedlings was quantitative and mainly governed by two pairs of major QTLs and multiple minor QTLs. This disease can be a major production problem. Although all cucurbits are susceptible, symptoms are less common on cucumber and melon because many commercial cultivars have resistance. To better understand the resistance to GSB in cucumber seedlings, a set of 160 F 9 recombinant inbred lines (RILs) and a total of 405 pairs of SSR primers were employed to detect quantitative trait loci (QTLs) conferring the resistance. Powdery mildew is a common disease of cucurbits under field and greenhouse conditions in most areas of the world. Stagonosporopsis cucurbitacearum), is an important disease of cucumber (Cucumis sativus L.) worldwide. (1983), Resistance to benzinidazole fungicides in the Gummy stem blight pathogen Didymella bryoniae on cucurbits. Gummy stem blight (GSB), caused by Didymella bryoniae (syn. Plant fungicide treated seed rotate crops on 4 year rotation.
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