III. ANTIIRACNOSE OF THE BLACK RASP- 

 BEIIRY."- 



WENDELL PADDOCK. 



SUMMARY. 



The following pages give an account of experiments in com- 

 bating antbracnose of the black raspberry, which were continued 

 through three successive years. While the treatment was suc- 

 cessful in preventing the spread of the disease to the new canes, 

 in no instance did the sprayed rows yield enough more fruit to 

 make the spraying a paying operation. Each person must de- 

 cide from the conditions existing in his own plantation whether 

 or not it will pay to spray for this disease. 



In localities where antbracnose has been sufficiently virulent 

 to warrant treatment the following measures are suggested. 



(1) Use only healthy plants and adopt a short rotation of 

 crops. 



(2) Protect the new shoots in the spring by spraying them 

 with Bordeaux mixture .when they are about six inches high; or 

 better still, spray for the first time when the first few scab spots 

 api)ear on the young canes. Follow the first spraying with two 

 others, or more if it seems best, at intervals of about ten to 

 fourteen days. Remove all old canes and badly diseased new 

 ones as soon as the fruiting season is over. 



INTRODUCTION. 



The growing of most of our fruits of commercial importance is 

 attended with more or less difticiilty because of the attack of 

 plant diseases and injurious insects. In this respect the rasp- 

 berry is no exception, but it is less liable to such attacks than are 

 many fruits. 



•Ueprint of Bulletla No. 134. 



