20 



Peach trees are an exception to this late spraying, because we want the one 

 application to control the San Jose Scale and the Peach Leaf-curl at the same time, 

 and to do this it is necessary to spray before the buds have begun to swell. If the 

 spraying is delayed until these are ready to burst, and if the weather has been wet 

 and cold, the Leaf-curl will not have been controlled. 



Fall spraying instead of spring where only one application is to be given is 

 advocated by some. Good results are usually obtained, but on the whole it is found 



^0^u^4 



Fig. 12. 



How an old orchard very badly attacked by San Jose Scale bad to be 

 pruned to get rid of dead branches and put it into shape 

 to save it (original). 



better to spray in spring. Some writers have been advocating summer applications^ 

 about July 1st or a little later for the scale. In my opinion, based on some tests 

 made, the results do not justify the trouble and expense. 



The Best Mixture to Use. — The lime-sulphur wash is to-day recognized all 

 over North America as much the safest, best and cheapest spray mixture to use 

 against San Jose Scale. Oil washes of various kinds have often given good results, 

 but they have also under certain weather conditions, which may occur any season, 

 caused much injury to the trees. They are much dearer than the lime-sulphur, 

 usually costing more than double as much. Moreover they have but little fungicidal 

 value, whereas lime-sulphur is well known to be a very valuable fungicide. In badly 

 infested old apple orchards the use of an oil wash, such as Scalecide or Target Brand 

 or even Kerosene Emulsion containing about 25 per cent, kerosene, to supplement 

 lime-sulphur for scale on the outer branches and twigs would be quite valuable, 

 because the oily nature of these sprays enables them to spread better over the bark 

 and get more easily into contact with any scales situated among .the pubescence on 

 the smaller branches where they are hard to reach with lime-sulphur. However,, 

 if orchardists remember the need of spraying these outer twigs very carefully on 

 account of the pubescence they can get quite satisfactory results with the lime- 

 sulphur alone. 



