282 



SCHOOL ENTOMOLOGY 



ation and the adults hibernate, but in the South there are 

 two or three generations. 



The eggs are readily seen and may be picked off and de- 

 stroyed. The adults are sucking insects and cannot be 



killed by insecticides, but 

 may be collected in early 

 morning from beneath 

 small boards and other 

 rubbish used as traps. 

 The nymphs may be killed 

 by spraying with kerosene 

 emulsion. Cucumbers 

 and melons may be pro- 

 tected by planting early 

 squash among them, as 

 the bugs prefer the squash 

 vines and may be col- 



FIG. 202. The squash-bug. (After 

 Chittenden, U. S. Dept. Agr.) 



a, mature female; b, side view of head, 

 showing beak; c, abdominal segments of 

 male; d, same of female; a, twice natural 

 size; b, c, d, more enlarged. 



lected from them. Clean- 

 ing up the vines in the 

 fall is of importance in 

 reducing the number which will hibernate. 



152. Cabbage Caterpillars. Imported Cabbage Worm * 

 (14). One of our most common garden pests is the well- 

 known cabbage worm, whose parent is the common white 

 cabbage butterfly. It was imported from Europe into 

 Quebec about 1860, and has since spread to all parts of the 

 country. The butterflies are among the first to emerge in 

 the spring. The females may be distinguished by having 

 two black spots on each fore wing, while the males have but 

 one. Both sexes have the tips of the fore wings and a spot 

 on the front margin of the hind wings black. Eggs are laid 

 by the females as soon as the food plant is available, and 

 * Pontia rapcc Linn. Family Pieridas, see page 98. 



