December, '11] METCALF: SPRAYING FOR GLOOMY SCALE 



515 



important. While tlie San Jose is very much less virulent than for- 

 merly, the quantity of lime sulphur applied to control it each year 

 is very considerable; and more spraying is done to control the apricot 

 scale than ever before. 



Of the parasites discussed, twoScutellista cyanea and Cryptochcetum 

 icerija—hsive been introduced. Of the Coccinellids mentioned all have 

 been introduced. While it should not be claimed that these parasitic 

 and predatory insects are not of considerable service, yet if they are 

 to be judged rigidly on results in commercial orchards, they cannot 

 be rated very highly. The writer thoroughly beUeves in making all 

 possible use of natural enemies to control injurious species, but at 

 the same time he cannot concur in the belief that most scale insects 

 in California are so controlled. 



TEST SPRAYINGS FOR THE GLOOMY SCALE (CHRYSOM- 

 PHALUS TENEBRICOSUS COMST.) 



By Z. P. Metcalf, State Department of Agriculture, Raleigh, N. C. 



The Gloomy Scale is the most important insect enemy of shade 

 trees in North Carolina, and is well distributed over all this State 

 south and east of the mountains. Its importance is due to two factors: 

 the enormous rapidity with which it breeds and the fact that it 

 is all but completely confined to the soft maples which have been 

 so largely used for shade purposes in our cities and towns. The 

 following tabulated results of careful tree to tree inspection of the 

 maples in portions of Raleigh and Red Springs will serve to make this 

 clear. 



RALEIGH. NEWBERN AVENUE AND EDENTON STREET 



Name of Tree 



Total number of 



Not infested 



Infested 



Slightly 



Badly 



SilverMaple. . . 

 Red Maple. . . , 

 Sugar Maple. . 

 Norway Maple 

 Box Elder 



