DISEASES INJURIOUS TO FRUITS. 



119 



Diseases of the Blackberry. 



The Crown Gall occasionally attacks blackberry canes near 

 the surface of the ground, causing irregular swellings. It has 



not generally proven seri- 

 ously injurious, but un- 

 doubtedly, the part of 

 wisdom would be to avoid 

 setting new plantations 

 from a field so infested. 

 The diseased canes should 

 be gathered and burned. 



Leaf Spot (Septoria 

 rubi). Tfais disease pro- 

 duces dark colored spots 

 on th-e foliage, which are 

 sometimes very abundant. 

 Spraying with Bordeaux 

 mixture is the best rem- 

 edy. 



Orange Rust. The 

 blackberry is also injured 

 by the orange rust, which is referred to under the head of Rasp- 

 berry. 



Diseases of the Raspberry. 



Leaf Curl. This name is indicative of one of the early 

 stages of the disease. The leaves curl up, and though they 

 may remain green all through the season, the plants make a 

 poor, weak growth. The fruit is dull in. color, small in size and 

 rather bitter in taste. Later the plants kill out, and any healthy 

 sets with which they may be replaced soon succumb to the 

 trouble. This disease spreads very slowly and, as a rule, at the 

 beginning there are only a few infected spots in a plantation, 

 which slowly increase in size from year to year. The spread of 

 the disease may be prevented to a great extent by pulling and 

 burning the diseased plants as soon as they appear. In setting 

 out a new plantation, use only land which has not been in rasp- 

 berries for several years and take great care to have young, 

 healthy sets. Do not accept plants from a weak plantation on 

 any account. 



Fig. 53. Crown or root gall of 

 blackberries. 



