28l 



BOARD OF AGRICULTURE AND FORESTRY. 



DIVISION OF ENTOMOLOGY. 



PRINCIPAL CITRUS INSECTS IN HAWAII, 



By Jacob KotIxVskv. 



(Continued from- May ''Forester.") 



"SNOW SCALE" OR ''ORANGE CHIONASPIS." 



(That is Chionaspis citri Comst.) 



This species of scale bug has not hitherto been recorded from 

 these islands. It was found in but one garden in Honolulu, but 

 its identity is unmistakable and because of its destructiveness l*."' 

 citrus trees in Florida and elsewhere, attention is here called to 

 its appearance. 



The female scale. — To the ordinary eye this looks so very much 

 like the purple scale as to be indistinguishable. But it is thinner, 

 considerably broader in proportion to its length and is distinctly 

 ridged along the entire length. In other respects it is quite similar 

 to the purple scale. The presence of this insect upon a citrus tree 

 is, however, readily recognized by the 



Male scale. — This is snow white, and as it usually occurs in 

 large numbers, gives the infested tree a rather striking appear- 

 ance — as if it were white-washed — hence the ''snow scale." Wc 

 have other "snow scales" in Hawaii but none of them were so far 

 observed on citrus plants. 



In habits and behavior it is so much like the purple scale that it 

 is unnecessary to dilate here. This applies also to the remedies 

 prescribed for the purple scale — they are equally effective against 

 the orange chionaspis. 



FLORIDA RED SCALE (CJirysoiupIiahis aoiiidiiin L.) 



This scale insect is very common on all the islands on a larger 

 number of plants, including the citrus group. It is seldom 

 numerous enough to do serious injury, but is frequently suffici- 

 ently numerous to attract attention. Being almost perfectly 



