Elementary studies in insect life Elementary studies in insect life elementarystudie00hunt Year: 1902 142 ELEMENTARY STUDIES IN INSECT LIFE the brood is few in ninnlior the larva finds, without much moving- about, sufficient nourishment to satisfy it. When the brood is large, as is sometimes the case, the caterpillars are forced to travel in order to satisfy their natural cravings for food. These insects are two-brooded. The second or mid- summer brood is the one which furnishes the largest army of worms. Some of this midsummer brood emerge before winter to lay eggs, and others pass the winte
Elementary studies in insect life Elementary studies in insect life elementarystudie00hunt Year: 1902 142 ELEMENTARY STUDIES IN INSECT LIFE the brood is few in ninnlior the larva finds, without much moving- about, sufficient nourishment to satisfy it. When the brood is large, as is sometimes the case, the caterpillars are forced to travel in order to satisfy their natural cravings for food. These insects are two-brooded. The second or mid- summer brood is the one which furnishes the largest army of worms. Some of this midsummer brood emerge before winter to lay eggs, and others pass the winter in the pupal stage. It is probable that the ma- jority of these insects spend the winter in the larval or pupal state. If the ground is stirred by plowing or harrowing in the early spring, it is evident that the majority of the hibernating larva? and pupa' will be destroyed. Mechanical means, such as the cutting down of the crop on the edge of the field where the caterpillars are entering, and destroying this crop by fire, are effective, since the larva1 are burned with the crop. The FIG. 113. Thepo- . tato beetle (Dory- march oi this enemy can sometimes be phora 10-lineata). (.}^}^] j)y plmving a furi'OW aCl'OSS its front and dragging a log back and forth through the furrow, crushing the insects as they crawl into the furrow. The Potato Beetle. — An insect which has been of great importance in connection with potato culture is the well-known potato beetle,1 ten-line beetle, or Colorado beetle. This insect passes the winter in the adult or pupal stage, and comes forth in the early spring to ^Doryphora 10-lineata
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