INSECTS INFESTING WHEAT. 



281 



Fig. 266. — Chinch Bug, enlarged — colors, Fig. 266. 



black and white. 



I have had many specimens of insects 

 sent me, those forwarding them stating 

 that they thought them to be the chinch 

 bug, l")ut so far I have not found a specimen 

 of this species in this State. 



Remedies. — Should this pest appear in 

 this State, it can be prevented from spread- 

 ing by trenching, as recommended in No. 

 86 ; use in the trenches No. 81 or 85. If 

 No. 85 is dusted on the perpendicular side of the trench, and 

 renewed every three or four hours, few of the insects entering 

 the trench will survive. See Nos. 20 and 56; also No. 106, A^ 

 as recommended for cleaning hop fields. 



CHAPTER CLXXXVI. 



The Grain Aphis. (Cal.) 



(Aphis avenx. — Fabricius. ) 



Synonym. — Siphonophora avense. — Fabr. 



Order, Hemiptera ; 

 Sub-order, Homoptera 



Famil}^, Aphidid.e. 



[Living upon the stems, leaves, etc., of wheat, barley, etc. ; 

 small brown, green or yellow plant-lice, which puncture the 

 plant with their beaks and extract the sap.] 



Fig. 267. — Grain 



Aphis ; 1, the winged 

 louse, enlarged (natu- 

 ral size indicated at^) 

 — colors, green, yel-!^^ 

 lowish and black ; 3, 

 a wingless louse, en- 

 larged (natural size 

 indicated at 4) — color, 

 green, yellow or brown. 



The wingless lice (Fig. 267 

 19 



Fig. 267, 



and 4,) are either dark brown 



