Potato Virus Y (Potyvirus PVY) in Pests not Known to Occur in North America

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Leaf symptoms. Immunostrip positive.

Bruce Watt, University of Maine, Bugwood.org

Leaf symptoms. Immunostrip positive.

Potato Virus Y (<em>Potyvirus PVY</em>) symptoms on potato (<em>Solanum tuberosum</em>)

Bruce Watt, University of Maine, Bugwood.org

Potato Virus Y (Potyvirus PVY) symptoms on potato (Solanum tuberosum)

Mild symptoms of this virus disease include leaf mottling and crinkling, prominent veins, and curved midribs. Leaf tissue, except for that around the veins, turns slightly yellow in color. This gives the veins a green-banded appearance. As the leaves mature, sunken brown spots may develop on the upper surface of the midrib. Systematic necrosis frequently occurs in cultivars resistant to root-knot nematodes. As lower leaves begin to ripen, midribs may turn black; leaves may die and fall from the stalk. If the stalk is split, areas of black discoloration will be found extending from top to bottom of the plant.

R.J. Reynolds Tobacco Company , Bugwood.org

Mild symptoms of this virus disease include leaf mottling and crinkling, prominent veins, and curved midribs. Leaf tissue, except for that around the veins, turns slightly yellow in color. This gives the veins a green-banded appearance. As the leaves mature, sunken brown spots may develop on the upper surface of the midrib. Systematic necrosis frequently occurs in cultivars resistant to root-knot nematodes. As lower leaves begin to ripen, midribs may turn black; leaves may die and fall from the stalk. If the stalk is split, areas of black discoloration will be found extending from top to bottom of the plant.

Mild symptoms of this virus disease include leaf mottling and crinkling, prominent veins, and curved midribs. Leaf tissue, except for that around the veins, turns slightly yellow in color. This gives the veins a green-banded appearance. As the leaves mature, sunken brown spots may develop on the upper surface of the midrib. Systematic necrosis frequently occurs in cultivars resistant to root-knot nematodes. As lower leaves begin to ripen, midribs may turn black; leaves may die and fall from the stalk. If the stalk is split, areas of black discoloration will be found extending from top to bottom of the plant.

R.J. Reynolds Tobacco Company , Bugwood.org

Mild symptoms of this virus disease include leaf mottling and crinkling, prominent veins, and curved midribs. Leaf tissue, except for that around the veins, turns slightly yellow in color. This gives the veins a green-banded appearance. As the leaves mature, sunken brown spots may develop on the upper surface of the midrib. Systematic necrosis frequently occurs in cultivars resistant to root-knot nematodes. As lower leaves begin to ripen, midribs may turn black; leaves may die and fall from the stalk. If the stalk is split, areas of black discoloration will be found extending from top to bottom of the plant.

Mild symptoms of this virus disease include leaf mottling and crinkling, prominent veins, and curved midribs. Leaf tissue, except for that around the veins, turns slightly yellow in color. This gives the veins a green-banded appearance. As the leaves mature, sunken brown spots may develop on the upper surface of the midrib. Systematic necrosis frequently occurs in cultivars resistant to root-knot nematodes. As lower leaves begin to ripen, midribs may turn black; leaves may die and fall from the stalk. If the stalk is split, areas of black discoloration will be found extending from top to bottom of the plant.

R.J. Reynolds Tobacco Company , Bugwood.org

Mild symptoms of this virus disease include leaf mottling and crinkling, prominent veins, and curved midribs. Leaf tissue, except for that around the veins, turns slightly yellow in color. This gives the veins a green-banded appearance. As the leaves mature, sunken brown spots may develop on the upper surface of the midrib. Systematic necrosis frequently occurs in cultivars resistant to root-knot nematodes. As lower leaves begin to ripen, midribs may turn black; leaves may die and fall from the stalk. If the stalk is split, areas of black discoloration will be found extending from top to bottom of the plant.

The initial symptom of PVY infection is vein clearing on newly developing leaves. The extent of the vein clearing is intermediate between that caused by TEV and TVMV. Leaves then develop a faint mottling and the characteristic vein banding: dark green bands along the veins with lighter green tissue adjacent. The pattern is more regular than that caused by TVMV. Veinlets and veins may become necrotic on plants infected with severe strains of PVY. This Virus is transmitted from vegetables and weeds to tobacco by migrating aphids.

R.J. Reynolds Tobacco Company , Bugwood.org

The initial symptom of PVY infection is vein clearing on newly developing leaves. The extent of the vein clearing is intermediate between that caused by TEV and TVMV. Leaves then develop a faint mottling and the characteristic vein banding: dark green bands along the veins with lighter green tissue adjacent. The pattern is more regular than that caused by TVMV. Veinlets and veins may become necrotic on plants infected with severe strains of PVY. This Virus is transmitted from vegetables and weeds to tobacco by migrating aphids.

Potato Virus Y (<em>Potyvirus PVY</em>) symptoms on potato (<em>Solanum tuberosum</em>)

Bruce Watt, University of Maine, Bugwood.org

Potato Virus Y (Potyvirus PVY) symptoms on potato (Solanum tuberosum)

Leaf symptoms. Immunostrip positive.

Bruce Watt, University of Maine, Bugwood.org

Leaf symptoms. Immunostrip positive.