INSECTS INFI^STIXG THE WALNUT TREE. 



CHAP. I 



The Walnut Scale (A»pidiotus juglans- The Red Scale {At-pidiotit)i aurantii). 



regice) 147 ' The Yellow-necked Caterjiillar (£>af ana min- 



I intra). 



The following insects also infest the Walnut i The Fall Web-worni {tlijphantria textor. 



tree : ' The Tussock Moth (Orygia letccoatigma). 



CHAPTER CXLVII. 



The Walnut Scale. (Cal.) 



{Aspidiotus juglaiis-regise. — Comstock. ) 



Order, Hemiptera ; ^ -n. -i ,, 



o T 1 TT [ Family, Coccid.!:. 



Sub-order, Homoptera ; ) -" 



[A grayish-brown scale, infesting the walnut tree.] 

 Mr. Alexander Craw, of Los Angeles, sent me specimens of 

 this scale in 1881. I have examined several trees infested by 

 this species of scale, and find that they spread rapidly on the 

 bark of the limbs and branches. 



NATURAL HISTORY. 



The female scale measures one line in diameter — color, gray- 

 ish-brown ; form — circular, or slightly elliptical ; exuviaj or 

 larval skin on one side of the center, giving the shell in some 

 cases the appearance of a cockle shell. The scale of the 

 male is similar in form to the male of the red scale, and is of 

 the same color as the female scale, which is grayish-brown. 

 The female is pale yellow, with golden colored spots ; when 

 matured she is of a rich amber color. This species infests the 

 limbs and branches. I have a specimen of a limb over two 

 inches in diameter, the bark of which is entirely covered by 

 this pest. 



Remedies. — Use Xo. 11, 12 or 13, when the tree is dormant ; 

 or No. 4 in Summer. 



