120 INJURIOUS INSECTS OF igt),. 



Apply warm, as it thickens on cooling. It is recom- 

 mended for Rose Mildew, ''Red Spider,'' Plant Lice, etc. 

 (Am. Gard., Feb. 8, 1902.) 



51. Sulfur — 



Sulfur, applied as riowers of sulfur, dry, through a 

 blow-gun of some sort, or mixed in water or soap solution in 

 the proportion of an ounce to a gallon of the liquid and 

 applied as a spray, is especially destructive to "red spiders.'' 

 (Col. Agr. Exp. Sta. Bui. 71, 1902.) 



52. Tobacco — 



This is a very important contact insecticide. In the form 

 of tine dust it is excellent for bearing trees affected with 

 root-lice; two-thirds inch of surface earth is taken away from 

 around the tree and i j^s to 2 pounds of dust is evenly scattered 

 over the surface and afterwards covered with earth. The 

 first application should be made in June, and if necessary 

 repeated in August. (Md. Agr. Exp. Sta. Bui. 65, 1900.) 

 It may also be used in the form of dry stems against root- 

 lice by applying it in the same way as the dust. 



As a decoction of the stems it may be used as a spray 

 against plant lice ; or first spray with water and then 

 sprinkle with the dust. (Col. Bui. 71, 1903.) 



The decoction is also good for lice on cattle. 



Tobacco smoke, when generated in an enclosed space, is 

 fairly successful in combating plant lice. 



53. Turpentine — • 



Similarly used a.'^ Benzine and Gasoline. 



54. Whale Oil Soap— 



This is good in combating scales in family orchards or 

 in old commercial orchards. It is too expensive, however, 

 for general use. (Ga. Exp. Sta. Board of Ent. Bui. 5, 1902.) 



For the winter spraying of scales use: 



2 pounds of the soap to each gallon iif lioiling water. 



