Elementary studies in insect life Elementary studies in insect life elementarystudie00hunt Year: 1902 140 ELEMENTARY STUDIES IN INSECT LIFE year on undisturbed soil are favorably placed for the increase of these native grasshoppers. There is in the undisturbed alfalfa meadow an opportunity for the quiet hibernation of the egg and the proper nourish- ment for the young insect. Life under such conditions is free from many of the contingencies which arise in the struggle for existence. Here these insects will be found in undue numbers until they have by con- tinuous defoliation destroyed their m
Elementary studies in insect life Elementary studies in insect life elementarystudie00hunt Year: 1902 140 ELEMENTARY STUDIES IN INSECT LIFE year on undisturbed soil are favorably placed for the increase of these native grasshoppers. There is in the undisturbed alfalfa meadow an opportunity for the quiet hibernation of the egg and the proper nourish- ment for the young insect. Life under such conditions is free from many of the contingencies which arise in the struggle for existence. Here these insects will be found in undue numbers until they have by con- tinuous defoliation destroyed their means of support, the alfalfa; or until the farmer has interfered and removed them. FIG. 112. Plan for hopperdozer. It may not be possible to destroy all eggs by harrow- ing and plowing. To insure the destruction of such grasshoppers as may hatch, a machine called the ' hop- perdozer ' is used. This consists of two shallow pans about four feet long, two feet wide and eight inches deep, placed on wooden runners corresponding in height to the crop. At the back of these pans there
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