142 



CROP PRODUCTION 



as soon to kill the tree. Winter spraying with the lime- 

 sulphur wash will destroy the pests, although when trees 

 are badly infested it is generally necessary to prune back 

 severely before the spray is appHed. 



Peach fruits are commonly attacked by the Plum 

 Curculio. When the insects are abundant it is necessary 

 to spray or to resort to jarring on sheets or CurcuHo 

 catchers to destroy them. Peach foliage is very sensi- 

 tive to injury from arsenical poisons, but is not injured 

 by spraying with arsenate of lead. The Department 

 of Agriculture has demonstrated that the Peach Scab, 

 Fruit Rot, and CurcuHo may all be controlled by three 

 sprayings with two pounds arsenate of lead to fifty 

 gallons self-boiled Hme-sulphur wash, first when shucks 

 are falHng from young fruits; second two or three 

 weeks later; third one month before fruit ripens, with- 

 out lead arsenate in the latter case. 



