COVER small fruit pest mgmt hndbk.indd
Short summary:
This virus is. transmitted through the soil by the dagger nematode. (Xiphinema americanum). Control of Virus Diseases. Always start new plantings with the ...
Long summary:
COVER small fruit pest mgmt hndbk.inddPage 1Midwest Small Fruit Pest Management Handbook 75branch. Each year the plant loses more vigor and is progressively more dwarfed. Fruiting laterals are shorter and more upright than normal ones. Berries on infected plants may ripen prematurely and are small dry seedy and crumbly.The raspberry leaf curl virus the causal agent of raspberry leaf curl disease is spread exclusively by the small raspberry aphid (Aphis rubicola). Heavy populations of this aphid can cause severe inrolling of leaves even in the absence of the leaf curl virus. Winged forms of the aphid can transmit the virus to healthy raspberries from nearby infected brambles. Windborne aphids may spread the disease several miles.Raspberry StreakRaspberry streak caused by tobacco streak virus is generally a minor but widespread disease. It is presently limited to northern Ohio western Pennsylvania and western New York. Streak affects only black raspberries.The most obvious symptom of the disease is numerous purplish streaks that appear on the lower parts of infected canes. Usually the streaks are less than an inch long. Terminal leaves on infected canes are often hooked or recurved twisted or rolled and darker green than normal. Leaves on the lower positions of the cane may show yellowing along veins and mottling. Fruits on infected canes are smaller than normal dull seedy and crumbly and lack flavor. The individual drupelets often ripen unevenly giving the fruit a blotched appearance.Tomato Ringspot VirusThis virus disease occurs only in red raspberries and is widespread in the major red raspberryproducing areas of the Pacific Coast and northeastern United States. Infected plants may appear normal but they are usually somewhat less vigorous than healthy plants. The most obvious symptom of the disease is the production of small crumbly berries that fall apart when touched. The crumbly berry is caused by the failure of some of the tiny fruitlets (druplets) which make u ...
Source: ohioline.osu.edu
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