INSECT PESTS 



243 



in the season while the insects are not numerous will 

 generally keep them under control. It has been found 

 that by spraying in the morning with a ten per cent 

 mechanical mixture of kerosene the insects are knocked 

 to the ground, when by spraying them while on the 

 ground with a twenty-five to thirty per cent mixture 

 they will be destroyed. 

 Many other in- 

 sects attack the 

 grape, but while a 

 few of them do seri- 

 ous harm and many 

 of them are destroyed 

 by the insecticides 

 used for these de- 

 scribed, it is the part 

 of wisdom to exam- 

 ine the vines criti- 

 cally whenever work- 

 ing among them and 

 to be sure that they 

 are not in sufficient 

 numbers to do any 

 very great damage. 



Fig. 129-Currant Worm Fly 



INSECTS ATTACKING THE CURRANT 



The Imported Currant Borer (Sesia tipiili- 

 formis) This insect lays its eggs at the base of buds 

 in the spring or early summer, the larvae penetrating 

 into the center of the canes, feeding on the pith, and 

 causing the leaves to turn yellow or the cane to break 

 off. The following season it comes out a perfect insect 

 to again go through its range of life. 



Remedy The presence of this pest may be known 

 by the yellow color of the leaves, or the premature 

 ripening of the fruit, when the injured canes should be 



