SPRAYING FOR THE PLUM GURGULIO. 



The question as to the feasibiHty of using Bordeaux mixture 

 and Arsenate of Lead against the various fungous diseases and the 

 Plum Curculio, attacking apple and plum, was assigned as an ex- 

 periment for the years 1907 and 1908, to l\Ir. A. G. Ruggles of this 

 Division. His report on this v\^ork follows: 



Ever since spraying has been recognized as a source of pro- 

 tection against injurious insects, more or less attention has been 

 given to spraying for Curculio. In the East many fruit growers 

 today feel confident that they can control this pest of the plum with 



Fig. 32. Curculio catcher usud in juiriiig trees. After Slingerland. 



an arsenical spray, while others still adhere to the old method of 

 jarring the trees and catching and destroying the beetles. See Fig. 32. 

 As all Alinnesota fruit growers know, one of the greatest draw- 

 backs to successful plum growing is the injury caused by the Plum 

 Curculio. Often we have been told that "the plums set well and 

 then all drop ofif before time for picking." Upon examination of 

 these fallen plums 90% at least were found with the Curculio mark 

 upon them. See Fig. 33. 



