CLASSIFICATION AND DESCRIPTION OF COMMON INSECTS 1 27 



The chief Chalcid parasites are Prospaltella perniciosa Tower, 

 Aphelinus fuscipennis How., and A. diaspidis How., but the percentage 

 of parasitism is too low for eflfective control. 



Fig. 79. — Pygidia of Aspidiotus. Showing the characteristic differences in 

 five common species. Greatly enlarged. D, dorsal surface; V, ventral surface. 

 {After Sanders.) 



Control. — Plant fumigated nursery stock; spray with hme-sulphur 

 wash (sp. gr. 1.03) before the buds burst; spray with certain miscible 

 oils (see Part IV). 



The three closely related species, Putnam Scale (A. ancylus Tutn.) 

 wintering in nearly full-grown condition and oviparous, the eggs 



