434 OHIO EXPERIMENT STATION: BULLETIN 332 



PLATE LII 



Fig. 1. — The Cottony Maple Scale (Pulvinaria vitis). Adult female with 

 cottony covered egg mass. A little less than natural size. 



Fig. 2. — Cottony maple scale. Adult females enlarged. This illustration 

 shows how the mass of eggs covered with loose cottony or waxy threads props 

 up the body of the female insect. 



Fig. 3. — Scales and egg masses of the Cottony Maple Leaf Scale {Pulvi- 

 naria acericola) on the underside of a maple leaf. Enlarged. 



Fig. 4. — The migrating young scale insects of the Maple Phenacoccus 

 (Phenacoccus acericoUi) on the trunk of a maple tree. About natural size. 



Fig. 5. — The irregular cottony masses which cover the mature insect and 

 eggs of the maple Phenacoccus. 



