INSECTS AND DISEASES 319 



pearing in May and June. Easiest removed by- 

 hand picking. Spray with arsenate of lead. 

 Hot water at a temperature of 125° Fahren- 

 heit is also effective. 



Rose-leaf Hopper — A small whitish-green 

 bug, quickly flying or jumping whenever the 

 bushes are jarred. Appears in July. Sucks 

 the foliage. Spray with kerosene emulsion, 

 whale-oil soap or tobacco. Pyrethrum powder 

 blown on the leaves when damp is another 

 remedy. 



Rose Scale — A white scale incrusting the 

 canes. Appears all the year. Spray with 

 kerosene emulsion in latter part of May and 

 remove badly infested canes. 



Rose Slug — ^A slug-like larva that devours 

 the surface of the leaves, appears in June, July 

 and August. Spray with ammoniacal copper 

 carbonate once every eight or ten days. 



San Jose Scale — Scale insect spreading rap- 

 idly where it gains a foothold. Circular, one- 

 sixteenth of an inch in diameter. Kerosene 

 emulsion, whale-oil soap and lime-sulphur wash 

 (the last in winter only). 



Scurfy Scale — While common and widely dis- 

 tributed, this scale has seldom become numer- 

 ous enough to cause any material damage. 



