SMALL FRUITS 215 



many insects or diseases. The orange rust, 

 which produces brilliant colored spore pustules 

 on the leaves, is the most conspicuous and the 

 most injurious. Some varieties are more liable 

 to be attacked than others and for that reason 

 growers are trying to avoid susceptible sorts. 

 Anthracnose, a fungous disease of the canes, is 

 best kept in check by removing and burning the 

 canes, as soon as they have fruited. Stalk 

 borers sometimes cause injury which shows 

 itself in the wilted canes. It is good practice 

 to cut and burn any plant which shows an 

 abnormal condition. 



One other " insect " is almost certain to be 

 found in blackberry fields and that is the har- 

 vest mite or "chigger." This crawling and 

 burrowing pest makes life burdensome for the 

 pickers unless they take the precaution of dust- 

 ing themselves thoroughly with fine flour sul- 

 phur. The sulphur either kills the mites or 

 repels them — at any rate one so protected is 

 immune from their attack. 



Raspberries are closely related to the black- 

 berry — the chief difference being that the 

 berry in the former case separates readily 

 from the receptacle on which it grows, coming 

 off like a thimble from a finger. With black- 

 berries the entire receptacle is picked and 

 forms a part of the fruit. Practically all of 

 our commercial raspberries are derived from 



