Virus pvy potato

In general, the necrotic strains tend to cause a more mild mosaic symptom than PVYO in potato. The distinction among strains is imprecise because recombination among PVY strains is common, i.

Recent surveys indicate that recombinant isolates are not uncommon in many potato production areas. PVYN is common in Europe and has been reported from other countries around the world including Canada. Subsequently it has been identified in several other regions of the northern U. All three viruses are capable of causing tuber necrosis in potato. Disease Spread PVY is spread naturally in a non-persistent manner by many aphid species, and can be mechanically transmitted.

Virus is transmitted when an aphid initially probes the plants. These brief "taste testing" probes that last from several seconds to several minutes are long enough to both acquire virus from infected tissue and to inoculate healthy plants if the aphid has previously fed on an infected plant.

Furthermore, if young plants are infected the virus has more time to build-up within the plant and cause more severe symptoms or migrate to the tubers. Weather and other environmental conditions also influence the severity of PVY, and the expression of symptoms in different crops and cultivars.

If you have experienced PVY in your fields please get in touch with us so that we can begin to better document the extent of damage being caused in MA and so we can put you on a list of contacts for upcoming outreach events and workshops on PVY.

Write us at umassvegetable umext. Agricultural Experiment Station. Commercial Horticulture. Environmental Conservation. Soil and Plant Nutrient Testing Laboratory. North American Aquatic Connectivity Collaborative.

Crops, Dairy, Livestock and Equine. Greenhouse Crops and Floriculture. Pesticide Education. Back to top Solanaceous, Potato Virus Y. Management Use only certified disease free seed tubers. Choose potato varieties carefully. Plant a barrier crop. Distribution: Worldwide, throughout the United States. Host biology: Host alternation, overwinters on woody perennials bird cherry Padus racemosa or plum Prunus spp. Heavy colonization occurs on winter wheat in early spring and late fall.

Cabbage aphid or mealy cabbage aphid Brevicoryne brassicae Description: Small sized insects. Apterous grayish green or dull mid-green with dark head. Dorsum abdomen with transversal markings and densely covered with grayish white mealy wax. Both morphs have short siphunculi, not longer than cauda, which is triangular.

Distribution: World-wide, throughout the United States. Host biology: No host alternation. On many species of Brassicaceae, commonly found on Brassica oleraceae. Chenopodium aphid Hayhurtia atriplicis Description: Small to medium-sized insects. Apterous green, covered with white wax powder.

Dorsum abdomen of apterous without transversal markings. Only winged females with small transversal markings. Both morphs with short siphunculi, and finger-shaped cauda. Living inside pod-like yellowish pseudogalls forming of rolling leaves upawards usually on Atriplex spp.

Corn leaf aphid Rhopalosiphum maidis Description: Small insects with rectangular-shaped body, bluish-green to dark olive with a purplish patch near the base of cornicles. Short antennae and prominent black cornicles.

Can be confused with R. Host biology: No host alternation, feeding primarily on grasses, preferring sorghum as a host but also corn, barley, millet, sudan grass, and other cereals. Infestations occur in late summer August, September. Cowpea aphid Aphis craccivora Description: A relatively small aphid.

The adult is usually shiny black while the nymph is slate gray, often dull not shiny. Distribution: Worldwide, including North America. Host biology: Polyphagous, though prefers members of Legume Family Fabaceae. Cowpea aphid secretes a toxin while feeding and, when present in high numbers, can cause wilting, discoloration, stunting and death of the plant.

English grain aphid Sitobion avenae Description: Body color yellow-green to reddish brown with long black legs and black cornicles, giving it a spider-like appearance. This medium-sized aphid with black antennae and black leg joints. Distribution: Worldwide, all areas of North America with preference to cool, temperate climate zones. Host biology: Host alternation. Overwinters on winter cereals and cereal weed species. In summer, occurs primarily on cereals including maize, wheat, and rice.

Can develop on many cultivated or wild species of Family Poaceae, in addition to some species in the Families Juncaeae and Cyperaceae.

Usually appears later in the season than other cereal aphids late August, September. Greenbug Schizaphis graminum Description: Yellow-green, pear-shaped body, with a dark green stripe down the abdomen. The uniformly dark antennae extend more than half as long as the body.

Tips of the cornicles and legs are almost black. Host biology: This species does not alternate between overwintering and summer hosts. Subscribe by Email Get the latest site news by email Please, insert a valid email. Your Email Leave this field blank Spam protection has stopped this request.

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