320 STATE BOARD OF AGRICULTURE. 



Japan plum; foliage slightly injured. 

 European plum; foliage slightly injured. 

 Sour cherry; foliage slightly injured. 

 Apple; foliage very slightly injured. 



Scalccide, diluted to 1 to 20 with water: 

 Peach; foliage very slightly burned. 

 Pear; no perceptible injury. 

 Sour cherry; no injury observable. 

 Japan plum; very little injury. 

 Apple; no perceptible inju^ry. 



In examining the results it will be noted that the sulphur sprays, 

 with the exception of Con-Sol, were used at full strength and half 

 strength, while with the patented mixtures they were used full strength 

 or as recommended for spraying in the dormant season. The sulphur 

 sprays burned the foliage of the apple and pear worse than that of peach, 

 plum or cherry, although the foliage of the latter are considered the more 

 tender. The addition of salt to the sulphur sprays causes increased in- 

 jury to foliage and in no instance was it shown that it is safe to apply 

 lime and sulphur sprays at more than half strength and upon the apple 

 and pear this is too strong. Of the manufactured mixtures, Scalecide 

 when diluted to 1 to 20, caused the least injury to foliage and can be 

 considered the most promising of any of the mixtures tested as summer 

 spray for the San Jose scale so far as injury to tree is considered, and 

 even this does some harm. 



In the report of this Station for 1904, (Special Bulletin No. 30), 

 details are given of several experiments with caustic soda, and of dif- 

 ferent methods of cooking the lime, sulphur and salt wash. The con- 

 clusions arrived at were that caustic soda was practically worthless as 

 a scale destroj^er, while no live scale were found upon the trees sprayed 

 with the lime and sulphur sprays, regardless of the method of cooking 

 or whether salt was added or not. At the time the examination was 

 made, the trees sprayed with the caustic soda were so badly infested 

 with the crawling larvae that it was thought best to try a sunyner spra}' 

 of kerosene emulsion and accordingly the trees were sprayed, using one 

 gallon of kerosene, one pound of soap to ten gallons of water. The 

 trees were not examined again until March. The results were prac- 

 tically the same at all of the places, a very few living scale being found 

 upon all of the trees in the different plots when the lime and sulphur 

 sprays were used, regardless of the method of cooking the wash. How- 

 ever, there were so few scale that the owners decided to leave the trees 

 without spraying this year and note the effects. Keports have been 

 received from both parties. They agree that it was a mistake not to 

 spray the trees last spring, and with even a few scales upon them 

 such has been their reproduction that many of the trees are quite badly 

 infested. It is probable that when trees are covered with this insect 

 it will be better to spray the trees every year until at least the number 

 of scale present is very small. Little difference was noticeable between 

 the results secured with the different formulas and methods of prepar- 

 ing the sulphur and lime. 



