THE MONTHLY BULLETIN. 



195 



Upon apricots, prunes, cherries, plums, western chokecherry {Cerasus 

 demissa). Apple stock is attacked to some degree also. 



Control. — Trees budded or grafted 

 upon stocks of any of the host plants are 

 sure to become infested, while it has been 

 found that the borer will not injure 

 trees grafted upon the Myrobalan plum 

 {Primus cerasifera) . The use of this 

 stock is becoming a sure means of con- 

 trolling the pest in the future. 



Protective washes of lime-crude oil 

 mixture, lime-sulphur-salt mixture ; or 

 lime, coal tar. and whale-oil soap are 

 recommended by Dudley Moulton as 

 sprays to be applied before the middle of 

 June. Digging out the worms or killing 

 them with a crooked wire should be 

 practiced in the winter months. 



Earl ]\Iorris, horticultural commis- 

 sioner of Santa Clara County, has 

 invented a method of control that promises to be better than anything 

 else yet tried. His method consists in applying grades " C " and " D " 



Fig. 181.— Adult male of the 

 California peach borer. (Orig- 

 inal.) 



Fig. 182. — Peach tree showing the asphaltum treatment 

 at the base for the peach borer (Sanninoidea opalescens 

 Edw. ). (After Morris, Courtesy Cal. Exp. Sta. ) 



of hard asphaltum. This is done early in the spring to infested trees 

 and a heavy coating prevents both the issuance and entrance of from 

 ninety-five to ninety-eight per cent of the insects. The material when 

 warm is applied from five to six inches below and above the soil surface 

 with a brush. Two coatings are recommended. This method should 

 follow fall and spring digging for the borers. 



