446 INSECT PESTS OF FARM, GARDEN AND ORCHARD 



with hyrdocyanic acid gas by the nurseryman or large grower 

 (see the author's Delaware bulletin). If a new bed be planted 

 near an old one it may become infested when the winged aphides 

 appear in early summer and to prevent their migration it may 

 be advisable to plow up the old bed some time before the winged 

 aphides appear, or preferably the previous fall. One of the best 



FIG. 319. A Delaware strawberry bed in summer of 1900 showing injury by 

 the strawberry root-louse. 



means of reducing the number of aphides in a bed is to burn it 

 over with a quick hot fire in early spring, Straw or grass should 

 be scattered over the bed and burned just as the growth of the 

 plants is commencing. As all the eggs and young aphides are on 

 the leaves and stems, this will practically clear the bed of the 

 pest, as well as many other insects and diseases, and if properly 

 done will result in no injury. This has been found satisfactory 

 in Delaware, but if farther south, the aphides winter on the roots, 

 it would not be as effective. 



