74 ECONOMIC ENTOMOLOGY 



IV. INSECTS INJURIOUS TO PEAS AND BEANS 



Planted Seeds: 



(a) Plant fails to come up, due to work of White Grubs or Wireworms, or Bean 

 or Seed Corn Maggot, p. 277. 

 Stalks and Leaves: 



(a) Plants cut off at night near surface of the ground. — Cutworms, p. 185. 



(b) Plants unhealthy, often killed by sucking lice. — Pea Louse {Macrosiphum 

 pisi), p. 149. 



(c) Plants (beans) sickly and sooty, caused by a black aphis feeding at the tips 

 at blossoming time. — Bean Aphis {Aphis rumicis), p. 148. 



Seeds: 



(a) Seeds (peas) within the pod partly eaten and web-covered; pellets of excre- 

 ment about injured seed. — Pea Moth {Las peyresia nigricana), p. 226. 



{b) Seeds within the pod (peas) perforated with holes; footless grubs within. — 

 Pea Weevil {Bruchus pisorum), p. 319. 



(c) Seeds (Beans) perforated with (sometimes many) holes; footless grubs 

 within. — Bean Weevil {Bruchus obtectus), p. 319. 



V. INSECTS INJURIOUS TO STORED GRAIN PRODUCTS 



(After Girault, Bull. 156 Illinois Ag. Exp. St.) 



Moths or Millers, 

 {a) Caterpillar small, whitish, living in grains of corn or wheat, pupating 

 within the grain, and emerging through a round hole covered with 

 silk at or near the tip of the kernel. Adult moths grayish clay- 

 yellow, small. — Angoumois Grain Moth {Sitotroga cerealella), p. 214. 

 {b) Caterpillars, spinning much silk, usually forming a silken tube to 

 which they retire; this tube covered with food particles. Living in 

 flour, meal, chaff, sometimes among grain, or in food substances. 

 Full-grown caterpillars make a cocoon. 



1. Caterpillar free-living usually not concealed within a silken tube, 

 olive-green to pinkish, infesting grain or meal, webbing particles 

 together, covering bags of grain with a web of silk and generally 

 scattering silk in all directions. The moth is brown and gray. 

 Cocoon elliptical, slender, fragile and of clear silk. — Indian Meal 

 Moth {Plodia inter ptmctella) , p. 214. 



2. Caterpillars living in densely woven silken cases covered with 

 particles of the food substance. Common in flour or chaff in 

 corners. 



(i) A yellowish white to pinkish caterpillar in flour, webbing it 

 together and forming a cocoon covered with particles of 

 flour. Moth dark grayish. — Mediterranean Flour Moth 

 {Ephestia kuehniella), p. 213. 



(2) A soiled grayish caterpillar, darker at each end, living 

 in chaff or other vegetable debris in dark damp places, 



