Report on the Noxious and Beneficial Insects of the State of Illinois Volume 27

Report on the Noxious and Beneficial Insects of the State of Illinois Volume 27

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1912 edition. Excerpt: the beetle develops within. It is formed in a definite cavity or cell within an infested grain. Development may be greatly retarded, or even arrested, by cold weather, the insect living on in whatever stage it may have reached. A generation may develop in three to six weeks, according to temperature. The larvae may reach full size in about sixteen days. This weevil is especially troublesome southward, where it infests corn in the field and afterwards in the crib. The beetles begin to deposit their eggs in the South, early in June, and continue until the corn is ripe, adults emerging in about a month after the eggs are placed. This weevil may infest most of the cereals, and is especially common in rice. It has also been found in tobacco, in boxes of crackers and cakes, in macaroni, and other bread stuffs, and in barrels of flour and bags of meal. Its effect on ears of corn infested by it resembles closely that of the Angoumois grain moth, and as many as three or four may live and mature in a single kernel of that plant. THE YELLOW MIEAL-WORM (Tenebrio molitor Linn.) This is a cylindrical, yellowish, shining grub (Fig. IO. 11) about an inch long when full-grown, with the general appearance of a thick wireworm, often found in stored flour, meal, bran, and other similar material. The adult belongs to the family known as Fig. 10. Yellow Meal-worm, Tenebrio molitor, larva, seen from above.-(larkling beetles (Tenebrionidrc), because they avoid the light. They do not infest crops. and are economically important only as they occur in stored products intended for consumption by man or beast. The beetle of this species (Fig. 12) is about five eighths of an inch long, somewhat flattened, with head and thorax minutely punctured, and more

Product details

  • Paperback | 50 pages
  • 189 x 246 x 3mm | 109g
  • United States
  • English
  • black & white illustrations
  • 1236979176
  • 9781236979179