PART II 



TABLES FOR THE IDENTIFICATION OF INSECTS INJURIOUS TO FARM, 

 GARDEN AND ORCHARD CROPS, ETC. 



I. INSECTS INJURIOUS TO CEREAL CROPS 



{Wheat, Rye, Barley, and Oats) 

 (Consult Bull. 52 C. E. F. Ottawa, Bull. 44 W. Va.. and Farmers' Bull. 132 U. S. Dep. Ag.) 



Roots: 



(a) Plants stunted, yellow, and withered or dead; roots eaten. 



1. Smooth, slender, wire-like, six-legged worms present in the soil. — Wire- 

 worms, p. 293. 



2. Presence in the soil of large soft-bodied whitish grubs with brown heads, 

 and hinder portion of body thicker than fore end. When disturbed 

 grubs curl up. — White Grubs, p. 302. 



3. Large dirty-brown maggots, ^-i inch long. — Meadow Maggots, p. 242. 



Stems and Leaves: 



(a) Young plants dwarfed, and color changed to yellow or brown; stems 

 shrivelled at the base, often bent or broken off; flaxseed objects found 

 embedded at or near the base. Oats immune. — Hessian Fly (Mayetiola 

 destructor), p. 245. 



(b) Stems above last joint dead, and the heads white — "silver top" or "white 

 head" disease. Greenish maggot in stem above last joint. — Wheal Stem 

 Maggot {Meromyza americana) and American Frit-fly {Oscinis carbonaria), 

 pp. 260-1. 



(c) Swellings or galls on the joints, and stems bent or broken before harvest. — 

 Joint Worm {Isosoma tritici), p. 354. 



{d) Stems broken down and tunnelled, blackish near the joints; heads turning 

 white; presence in tunnel of yellowish-white larva of saw-fly; oats immune. — 

 Western Wheat-stem Saw-fly (Cephus occidentalis), p. 349. 



(e) Leaves sickly and whitish; the presence of small red and larger black- 

 and-white bugs. — Chinch Bug (Blissus leticopterus), p. 161. 



(/) Stems and leaves sickly; the presence of many green or yellowish-green 

 plant-lice. — Wheat Plant-louse {Aphis avence), English Grain Plant-louse 

 (Macrosiphum granarium) , p. 142. 



(g) Stems and leaves eaten by large dingy striped caterpillars. — Army-worm 

 {Cirphis unipuncta), p. 190. 



{h) Leaves eaten by locusts or grasshoppers. Red-legged and other Grass- 

 hoppers. — {Melanoplus femur-rubrum et al.), pp. 109-113. 



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