gogldress.blogg.se

Watermelon mosaic virus 2 and ZYMV are also spread by aphids.

Within plantings, CMV is spread chiefly by aphids, but may also be spread by cucumber beetles. Cucumber mosaic virus, WMV2 and ZYMV overwinter in biennial and perennial plants and are usually carried to new plantings by aphids. It is unlikely that all hosts of ZYMV and WMV2 have been identified. Cucumber mosaic virus infects many vegetables and other plants unrelated to vine crops. Watermelon mosaic virus 2 infects vine crops and legumes (beans and peas) and other plants outside the cucumber plant family (Table 1), while ZYMV infects primarily vine crops (Table 2). Some virus-infected fruit become discolored and develop bumps.

General viral symptoms include leaf mosaic and distortion. Identification based on field symptoms alone can be misleading. Positive identification of the virus(es) infecting the crop is based primarily on serological tests, such as enzyme-linked immunosorbent assay (ELISA). Zucchini yellows mosaic virus causes such devastating crop loss that plants with mosaic symptoms that test positive for this virus should be destroyed to limit spread of this disease within a region. Along with causing severe distortion and discoloration of the fruit, ZYMV significantly reduces yields. Symptoms caused by ZYMV are often more severe than those caused by CMV and WMV2. Plants are especially damaged when infected as young plants because the yields are reduced and fruit quality is often affected by bumps and discoloration (Photo 2). Zucchini yellows mosaic virus, CMV and WMV2 all produce mosaic on foliage and fruit of infected plants. Infected plants may be stunted and distorted (Photo 1). Each of these viruses may infect squash, cucumber, zucchini and pumpkin alone or in combination. Other troublesome viruses that can occur in Michigan include cucumber mosaic virus (CMV) and zucchini yellows mosaic virus (ZYMV). Several viruses infect and damage squash, cucumbers and pumpkins in Michigan, but WMV2 is the most common. of controlling plant disease (45).Watermelon mosaic virus 2 (WMV2) was confirmed by Jan Byrne, plant pathology diagnostician from MSU Diagnostic Services, on winter squash. Within each tures, flavors, etc species there is a wide assortment of sizes, shapes, color variants, flesh tex­ (62). These genera and species include watermelon (Citrullus) cucumber, muskmelon, and gherkin (Cucumis) dish-rag and sponge gourds (Luffa) white-flowered gourd (Lagenaria) squashes, marrow, pumpkin, and figleaf gourd (Cucur­ hila) and chayote (Sechium). Some cucurbits are used as pot­ world basis as are cereals and legumes, but, from the tropics to the milder bitaceae, only 90 genera and 750 species in the family Cucur­ 6 genera and 12 species are cultivated by man. Although there are about dessert and salad ingredients, and as pickles. The cultivated cucurbits have needed man for survival since bona fide specimens of the wild counterparts of the cultivated species have apparently never been collected. Cucurbits are not as important on a portions of the temperate zone, they serve as a source of carbohydrates, as tery, baskets, insulation, and oil filters. Members of the Cucurbitaceae are among the important and widespread plants that supply man's food and fiber. Annual Review of Phytopathology Annual Reviews A large number of disease resistance fac­ tors have been incorporated into cultivated cucurbits, particularly during the past The

Breeding for Disease Resistance in Cucurbits Breeding for Disease Resistance in Cucurbits