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$Grapevine leave that are red, or blotched with red, are carrying a viral disease. These diseases are usually put down to a grapevine roll virus. Recently, however, a different strain known as red blotch virus was identified in the United States. \t A number of related viruses can cause leafroll virus disease, affecting red and black grape varieties. At this time of year (late summer) affected leaves turn reddish, and sometimes the leaf may curl at the edges. The disease can cause late fruiting and, in time, weakening of the vine. Some varieties can be infected with the virus and suffer no apparent negative effects. However, when the infected variety is grafted to a rootstock that is susceptible to leafroll virus, disease develops in the rootstock, eventually killing the vine.$

A closeup of yellowing maple leaves on branches under the sunlight in a Japanese park

Mahonia japonica is an evergreen shrub, which has been extensively cultivated in Japan and is commonly called Japanese mahonia, although it is native to China. Fragrant yellow flowers in loose, spreading to pendant racemes bloom in late winter to early spring (March-April). Flowers are followed by ornamentally attractive grape-like bunches of small waxy fruits which mature to blue-black in late spring to early summer.

autumn leaves near japan temple change the color in the japan park view in Kyoto

Fall Color Foliage Hits western Pennsylvania.

fresh foliage of Sorbus torminalis shrub in springtime

Red and orange leaves in Tokyo during the autumn/fall season

Multi-coloured deciduous sycamore leaves on a branch in autumn before they fall off for winter.

autumn tree background in japan, saitama, Japan

Autumn leaves form a frame of an out of focus background.

Autumn trees with red and yellow leaves.

Autumn park with trees during leaf fall, leaf fall in the autumn season with deciduous trees

Reddish green leaves and samaras of Norway maple against blue sky

Leaves beginning to change colors in early Autumn.

Colourful autumn leaves. Orange and yellow autumn leaves. Autumn background. Natural autumn fall view of trees with yellow orange leaf in garden forest or park. Inspirational nature in September and October

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