14: CROP PEST COMMISSION OF 



Putnam's scale (a) is frequently found in Louisiana and 

 while it seems to prefer shade or ornamental trees (such as maple, 

 cotton wood, etc.) it is occasionally found on orchard trees. It is 

 not usually as heavily parasitized as the cherry-scale and is 

 therefore a more dangerous pest. In destructiveness it does not 

 approach the San Jose scale. 



The Gloomy scale (6) is very cosmopolitan in habit and af- 

 fects a great variety of trees, being however, but rarely found in 

 orchards. On streets and private grounds in Shreveport we have 

 found it in abundance, indicating that the conditions in North- 

 western Louisiana are decidedly favorable for its rapid increase. 



The Obscure scale (c) is for the most part found upon water 

 oak(d) and is a comparatively large, dark-colored, flattened scale, 

 very unlike the San Jose, but is nevertheless often mistaken for 

 that species. 



When scale insects are found, especially upon fruit or orna- 

 mental trees, they should be sent to the Crop Pest Commission 

 for identification. The writer will take pleasure at all times in 

 advising fruit growers and farmers regarding the identity of 

 scale-insects found in their orchards and gardens. 



It is not within the province of this paper to discuss even 

 briefly the scale-insects of the State, nor even the injurious 

 species, of which there are many. A number of these species will 

 be treated of at a later date in a paper contemplated by the 

 writer and one of his assistants. 



The remedies recommended herein for the San Jose scale 

 are fully efficient against the other species mentioned above when 

 they occur upon deciduous trees. The sprays mentioned on sub- 

 sequent pages cannot, however, be used upon citrus trees or upon 

 evergreens. 



Development and Life History. 



Unlike the majority of our native scale-insects, the female 

 San Jose scale does not deposit eggs, but is viviparous. In other 

 words, the young are born active, the eggs hatching within the 



(a) Aspidiotus ancylus. 

 (&) Aspidiotus tenebricosus. 



(c) Aspidiotus obscitrus. 



(d) Querous aquatica. 



