262 



STATE BOARD OF HORTICULTUBE. 



of the body and lateral margins. The young creep along at 

 first, then settle along the underside of the leaves and on the 

 branches, which they seem to prefer, but after passing through 

 the second or third molt migrate to other parts of the tree. 



Since the introduction of the Australian ladybirds, Vedalia 

 cardinalis and Novius Koebelei, which devour it, this scale is no 

 longer considered a pest. 



Treatment. — When spraying is desired, formula No. 1 or 

 No. 3 will be found effective. 



Two distinct forms of Cottony Cushion Scale. (After Craw.) 



Genus DACTYLOPIUS. 



To this genus belong the insects commonly known as mealy 

 bugs. The antennfe of the female are six-jointed in the larva, 

 and eight-jointed in the adult. The male larva has seven- 

 jointed antenn;«. The tarsi are furnished with four digitules 

 and the anal ring with six hairs. 



Mealy Bug (Dactylopius adonidum, Signoret). 



(Fig. 1, Plate XXY; Fig. 2, Plate XXVII.) 



This mealy bug has made its presence felt in some portions 

 of the State. It congregates in large numbers in portions of 

 the tree, especially among the clusters of fruit. 



Treatment. — This insect is effectually destroyed by the ordi- 

 nary washes used for scale, and )>y the ladybird Cryptol;)jmus 

 viontro'uzieri, lately introduced. This ladybird is as effectual 

 ill destroying the mealy bug as the Vedalia and Novius are in 

 devouring the cottony cushion scale. 



