SPRAYING FOR INSECTS AND FUNGI. 147 



mixture, making it safer to store for further use, and it is 

 claimed that it is less liable to burn the foliage. The 

 approved formula now used is to boil in the open air one 

 pound of white arsenic and four pounds of sal soda with 

 one gallon of water until dissolved. This kept in a jug 

 labelled "Poison " constitutes the " stock mixture." "When 

 wanted for use add the milk of three pounds of fresh lime, 

 strained to remove sediment, to forty gallons of water. 

 Into the lime solution pour one pint of the stock mixture 

 and mix thoroughly by stirring. This is the formula used 

 in spraying for codling-moth, canker-worm, and all insects 

 that eat foliage or fruits. 



In spraying with Paris green the formula used is one 

 pound of Paris green and one pound of fresh lime in two 

 hundred gallons of water. 



Even where the slaked lime water is strained this mix- 

 ture is apt to clog the sprayer and its strength is not as 

 uniform as in the use of the arsenic and soda, and the same 

 is true at this time of London purple. 



157. Curculio of the Apple, Pear, Plum, Apricot, Cherry, 

 and Peach. The species of the curculio that penetrate the 

 fruit of the apple, pear, plum, apricot, cherry, and peach 

 are not identical, but their methods of working and treat- 

 ment are nearly the same. The apple and pear curculio 

 does not often do much damage at the North, but in some 

 of the Central States it is very destructive in the way of 

 knotting ar.d distorting the fruit. The plum curculio also 

 frequently feeds on the apple and its work is about iden- 

 tical with that of the apple curculio. 



The plum curculio or " Little Turk " is the most serious 

 pest of the plum orchard, and it also works on the cherry. 

 The plum, prune, apricot, and peach usually drop the 

 fruit that is perforated by the grub when the pit is reached. 

 But the cherry does not drop, but comes to the front 



