![]() ![]() The disease symptoms on cucumber are characterized by the appearance of small, water-soaked lesions on the underside of leaves. cubensis Rostov, is a major foliar disease of cucumber ( Palti and Cohen, 1980). In North Carolina, in 2012, the fresh and processing cucumber market was valued at $29 million ( USDA, 2012).ĭowny mildew, caused by the oomycete pathogen P. farm value of cucumber was $363 million, with 3.59 × 10 8 kg produced for the fresh and processing market ( USDA, 2013). capitata L.), and onion ( Allium cepa L.) ( Tatlioglu, 1993). The crop is cultivated in temperate and tropical countries and is the fourth most widely grown vegetable crop behind tomato ( Lycopersicon esculentum Mill.), cabbage ( Brassica oleracea var. Keywords: Cucumis sativus Pseudoperonospora cubensis disease adult stage resistanceĬucumber ( Cucumis sativus L.) is a major vegetable crop. Regardless of the mechanism involved, plant breeders should use the genetic resistance in PI 330628 and PI 605996 over PI 197088. However, although PI 197088 appears to have a rapid, indeterminate growth habit, it did not have more resistance at later stages of plant maturity. ![]() It is possible that these lines were resistant at late stages due to other factors, such as their rapid, indeterminate growth, that allows them to outgrow the disease. ![]() However, PI 330628 and PI 605996 held their resistance even at late developmental stages. In general, older plants had more disease symptoms, even those classified as resistant, such as PI 197088. Cultigens responded differently to disease across plant developmental stages. We tested a set of cucumber cultigens, including highly resistant PI accessions and susceptible control lines, to observe the effect of plant age on resistance. Development of cultivars with high levels of resistance remains an important objective of cucumber breeding programs. Cucumber accessions with high levels of resistance have been identified. cubensis, downy mildew continues to be a major threat to cucumber production in the United States. Downy mildew, caused by the oomycete pathogen Pseudoperonospora cubensis (Berkeley & Curtis) Rostov, is a major foliar disease of cucumber. ![]()
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