Arsenate of lead is now manufactured in two forms the 

 paste, which contains 50 percent of water, and the powdered or 

 dry, which is practically free from water. If the powdered 

 form is used, only one-half the quantity by weight is required. 

 The powdered arsenate mixes a little easier than the paste, has 

 just as good killing powers, and has the advantage of keeping 



over winter without danger of leaking or freezing. 



f 



DORMANT SPRAY 



The dormant or winter spray is used similarly on all fruit 

 trees, but the summer sprays differ somewhat according to the 

 kind of trees that are being treated. The dormant spray is 

 usually applied to control the San Jose scale, but if lime-sulphur 

 is used it is equally valuable in controlling peach-leaf curl and 

 blister mite. Because of the fact that the miscible oils will 

 spread to a certain extent some prefer to use them rather than 

 the lime-sulphur, but the constant soaking of the oil around the 

 roots of the trees has an injurious effect upon them. Since the 

 oils do not have any fungicidal qualities they cannot control 

 the peach-leaf curl or any other plant diseases as does the lime- 

 sulphur. In applying this dormant spray it is essential that 

 the whole tree be covered with the spray because this is a con- 

 tact spray and must hit the insect in order to kill it. If the 

 home-made concentrate is used, it should be diluted according 

 to the table previously given, while if the commercially pre- 

 pared solution is used and the material is fresh, it should be 

 used in the proportion of 1 gallon of the solution to every 8 or 9 

 gallons of water. 



Since the summer sprays will vary according to the variety 

 of the tree, the spraying of the different fruits will be con- 

 sidered separately. 



The third, fourth, and fifth summer sprays should be applied 

 at intervals of 10 days, using the same materials as above. As 

 these treatments are designed to control the curculio, the fungi- 

 cide may be omitted from the last two sprays if the foliage is 

 free from any signs of disease. 



Correction: This last paragraph 

 supplement Table V 



