. Class book of economic entomology, with special reference to the economic insects of the northern United States and Canada. Beneficial insects; Insect pests; Insects; Insects. CLASSIFICATION AND DESCRIPTION OF COMMON INSECTS 319 Larvce.—^Like while grubs; live in decaying wood. Pupa.—In an oval cocoon made of fragments of wood. BRUCHID^ (PEA AND BEAN WEEVILS) Pea Weevil {Bnichus pisorum Linn.). Adult.—A small brownish black beetle, X'^ inch long, with characteristic black and white markings; sides of thorax notched; abdomen projects beyond the wing-covers. Two black spots on uncovered portio
. Class book of economic entomology, with special reference to the economic insects of the northern United States and Canada. Beneficial insects; Insect pests; Insects; Insects. CLASSIFICATION AND DESCRIPTION OF COMMON INSECTS 319 Larvce.—^Like while grubs; live in decaying wood. Pupa.—In an oval cocoon made of fragments of wood. BRUCHID^ (PEA AND BEAN WEEVILS) Pea Weevil {Bnichus pisorum Linn.). Adult.—A small brownish black beetle, X'^ inch long, with characteristic black and white markings; sides of thorax notched; abdomen projects beyond the wing-covers. Two black spots on uncovered portion of abdomen; an- tennae 11-jointed; hind femora thickened and prolegs with two spines. A native of the old world (Fig. 208). Eggs.—Yellow, 3^0 inch long, spindle-shaped. Larva.—White fleshy wrinkled grub, about ^4 inch long when fully grown; 3 pairs of minute legs. Pupa.—White, becoming brown after thresh- ing or fumigating; thorax with notched sides; formed in the pea. Life-history.—K^\x\t winters over and eggs are laid on the forming pods. The larva bores through the wall of the pod and enters the seed, where it feeds and grows. The pupal stage 1 , , \r 1,1, • Fig. 208.— Pea lasts about a week. Mature adults develop m weevil: a, the grub; b, August, the majority remaining in the mature *^^ pupa, under surface; seed all wmter. Several grubs may mhabit face; d, the adult weevil. a single seed. Control.—Fumigate peas with carbon bisulphide; drench seed with kerosene; store the peas over for a season in tight sacks before planting; raise the temperature to i45°F. to kill the weevils. Bean Weevil (Bruchus obtectus Say). A dull.—-A small brown beetle, about 3-8 Jnch long, with wing-covers shorter than the body, and "marked with ten impressed and dotted longitudinal lines which are broken up into pale yellow dashes and dark brown spots" (Fletcher); body covered with short silky hairs; tips of abdomen, antennae and legs of a reddish tinge; antennae e
Size: 1051px × 2378px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectinsects, bookyear1919
