DISEASES IN GREENHOUSE 133 



50 to 60 eggs, depositing about six per day 

 for a period of nine days or so. The eggs 

 hatch after about four days. After two 

 days' activity, the young larvae pass into 



FIG. 22. TRIPHLEPS INSIDIOSUS, AN ENEMY OF THE RED 

 SPIDER. (after MC GREGOR.) 



the pupal or resting stage. The adults 

 mate and the female is soon capable of 

 laying. 



In the greenhouse the red spider mi- 

 grates from the tomato and other plants to 

 the sweet pea. The violet especially is a 



