368 OHIO EXPERIMENT STATION: BULLETIN 332 



PLATE XIX 



THE WHITE MARKED TUSSOCK MOTH 



(Hemerocampa leucostigma) 



Fig. 1. Witch hazel, Rockfeller Park, Cleveland, Ohio, photographed July, 

 1914, after having been defoliated by the first brood of tussock moth larvae. 

 About the time the caterpillars reached maturity they were attacked by an 

 infectious bacterial disease and practically every one was killed by it. At the 

 time the photograph was taken, the dead and shriveled caterpillars were lying 

 thick upon the ground. 



Fig. 2. So perfect was the work of destruction by the caterpillar disease, 

 the clump of witch hazel was able to develop a second crop of foliage which 

 was practically unmolested by the insects. This photograph was taken just 

 before frost. 



