210 



STATE BOARD OF AGRICULTURE. 



Fig. 7. Greenhouse Leaf-tyer, Slingerland. Caterpillar on skeletonized leaf above natural size and 



enlarged; larvae and pupae much enlarged. 



generations may occur in greenhouses, and Professor Forbes* thinks 

 that four generations out of doors are not too many. "' 

 age, however, is done under glass. 



The greatest dani- 



PALLIATIVE MEASURES. 



Thus far nothing better than constant watchfulness and the destruc- 

 tion of the larvae and pupae by hand, has been discovered. Fortunately 

 the work is usually in plain sight and conspicuous. 



♦ Bulletin GO, Illinois Experiment Station. 



