IDENTIFICATION OF INSECTS INJURIOUS TO CROPS 77 



Stalks and Leaves: 



(a) Stalks cut off at the ground. — CiUworms, p. 185. 



{b) Leaves eaten and infested with reddish soft grubs and striped beetles. — 



Colorado Potato Beetle (Lepiinotarsa decemlineata) , p. 308. 

 (c) Leaves riddled with small holes or surface eaten in spots by small active 



jumping black beetles. — Potato Flea Beetle (Epitrix cucumeris), p. 313. 

 {d) Leaves eaten and with a ragged appearance; presence of long black or 



striped soft beetles. — Blister Beetles {Epicauta spp.), p. 325. 

 (e) Stalk wilts and dies, tunnel in stalk near the ground, and presence of a 



white footless grub. — Potato Stalk Borer {Tricliobaris trinotata), p. 334. 

 if) Green plant-lice on the leaves; migrating to the rose. — Potato Plant-louse 

 {Macrosiphum solanifolice) . 



VIII. INSECTS INJURIOUS TO GARDEN VEGETABLES 



[Under the term "Garden Vegetables" may be included Asparagus, Beets, 

 Cabbage, Cauliflower, Celery, Cucumber, Onion, Parsnip. (Carrots, beans, peas 

 and potatoes have already been considered.)] 



Roots: 



(a) Roots of cabbage and cauliflower and bulb or base of onion mined by white 



maggots. — Root Maggots (Phorbia brassicce and Phorbia cepetorum), p. 273. 

 {b) Roots of cucumber, squash, melon and pumpkin eaten, and plants fail to 



come up. — White Grubs, Wireworms. 

 [c) Roots of cucumber, etc., gnawed and mined, plants wilt and die. — Striped 



Cucumber Beetle {Diabrotica vittata), p. 307. 



Stems and Leaves: 



(a) Young plants cut off near surface of ground. — Cutivorms. 



(b) Stalks, vines and leaves of cucumber, etc., eaten, and base, mined by small 

 white grubs. — Cucumber Beetles (Diabrotica spp.), p. 307. 



(c) Vines of cucumber, etc., wilted, and presence of large dark stink-bugs on 

 leaves. — Squash Bug (Anasa tristis), p. 160. 



(d) Leaves and vines of cucumber, etc., sickly and dirty, under surfaces infested 

 with greenish-black lice. — Melon Plant-louse {Aphis gossypii). 



(e) Surface of leaves of cucumber, etc., eaten by small black beetles. — Cucumber 

 Flea Beetle (Epitrix cucumeris), p. 313. 



(/) Leaves of cabbage, etc., ragged, eaten by pale-green caterpillars. — Cabbage 



Worm (Pieris rapa), p. 175. 

 (g) Leaves of cabbage, etc., wilted, and under-surface covered with greenish 



plant-lice. — Cabbage Plant-louse (Aphis brassicce), p. 148. 



IX. INSECTS INJURIOUS TO THE APPLE 



(Consult Manual of Fruit Insects by Slingerland and Crosby) 

 Roots: 



(a^l Bluish-white mouldy lice causing knots or swellings on the smaller roots. — 

 Woolly Aphis (Schizoneura lanigera), p. 145. 



