189 



every tree in the iufested orclmrd. It is f;ilse economy to spray only tlie trees 

 visibly infested. Frequently trees nuiy be slightly infested, so slight as to be 

 overlooked by the average orchardist. If such trees are left without spray- 

 ing the scale may increase so rapidly during a single sunniier that tlie trees 

 will be seriously injured before the following winter. — Bulletin yo. 21, 

 Ocoryia. 



Fall Spraying. 



Ccnrnil StiiiiiiKij:^ and t'uncJiisiuiix. 



In the previous work upon tliis problem the results attendins tlie applica- 

 tion of the suliihur washes were somewhat contacting, since some of the 

 treatments caused serious injuries to the buds and blossoms, while others 

 in no maimer affected tlie health of the trees. But as regards the insecti- 

 cidal valne of the treatments, all the experiments .showed that applications 

 at this season were uniformly effective upon scale. The work indicated 

 that the injuries sustained by tlie trees were balanced b.v their increased 

 vigour and fruitfiilnes, dne to the control of the scale. — BuUctin So. 273, 

 'New York Afniciilturtil E.riiciinienliil Station. 



