. Bush-fruits. Berries; Fruit-culture. 258 Bush-Fruits by the amount of leaf-tissue which is destroyed. Attempts to con- trol the trouble by spraying seem thus far not to have given results of much promise. LEAF-RUSTS Two species of Phragmidium, one on blackberries, the other on raspberries, are prevalent and sometimes abundant, though seldom considered injurious. They are found on the under side of the leaves and would be difficult to combat. Blackberries are sometimes at- tacked also by late rust which, as its name implies, appears late in the season. It is caused by the fungus Kuehneola uri
. Bush-fruits. Berries; Fruit-culture. 258 Bush-Fruits by the amount of leaf-tissue which is destroyed. Attempts to con- trol the trouble by spraying seem thus far not to have given results of much promise. LEAF-RUSTS Two species of Phragmidium, one on blackberries, the other on raspberries, are prevalent and sometimes abundant, though seldom considered injurious. They are found on the under side of the leaves and would be difficult to combat. Blackberries are sometimes at- tacked also by late rust which, as its name implies, appears late in the season. It is caused by the fungus Kuehneola uridinis (Lk.) Arth. DOUBLE-BLOSSOM (Fig. 37) Fusarium Rubi, Winter This disease is very destructive on certain varieties of dewberries and blackberries, from New Jersey southward along the coast, but especially in the Delaware-Maryland Peninsula. It is known to occur on several species of Rubus but is especially severe on Lucretia dewberry and Rathbun blackberry. It is re- ported to have been so destructive to Lucretia on the above peninsula as to drive one-half the growers out of the business. The life of a field of berries is often shortened two or more years by its ravages. The disease becomes noticeable when the leaf-buds open, the diseased buds usually being larger than normal ones. They are often ac- Fig. 37. Double- companied by one or more small buds at the blossom. gide> The diseased buds produce "witches' brooms" instead of normal shoots. These may consist of a mass of short slender twigs or of one good shoot, somewhat reduced, with several short deformed ones. Such diseased shoots often remain green after the old canes are dead. The blossoms usually have en- larged, thickened sepals and petals, and sometimes more than the usual number. The petals are generally wrinkled, giving the blos- som the appearance of being double. The disease generally appears about the second year of fruiting. Please note that these images are extracted from scanned page images th
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