34 



INSECT PESTS OF FARM, GARDEN AND ORCHARD 



can be picked, thus preventing the weevils feeding and starving 

 them out before they are ready to hibernate, and removing the 

 shelter for hibernation. For this reason all the remnants of a crop 

 such as stubble, vines, leaves, or stumps, as may be, should be 

 removed from the field as soon after it is harvested as possible. 

 Many insects hibernate in such rubbish and this fact may some- 

 times be utilized by thoroughly cleaning a field and leaving one or 

 two piles of rubbish in which many of the insects will assemble 



FIG. 25. A field of cabbage stumps in midwinter, affording ideal condi- 

 tions for the hibernation of cabbage pests. 



for hibernation, and which may then be burned or otherwise 

 destroyed. Many cabbage insects hibernate under the old stumps 

 and leaves and will congregate in piles of them. Premises upon 

 which the fence rows are kept free from weeds and grass and the 

 fields are cleaned up and plowed as soon as possible after a crop is 

 removed, usually suffer much less from insect pests than those of 

 more easy-going neighbors. 



Burning. Cleaning up of stubble and of wild vegetation 

 which furnishes food and shelter for insects may often be accom- 



