CLASSIFICATION AND DESCRIPTION OF COMMON INSECTS 233 



Probably two or more broods in a year in Canada; seven broods 

 at Rocky Ford, Colorado. 



Control. — Broadcast 2 to 3 cwt. ground lime per acre on appearance 

 of moths on a dewy morning. Brush off caterpillars. Spray the 

 caterpillars with kerosene emulsion, care being taken to get the solution 

 on the under surfaces of the leaves. 



Yponomeutid^ 



Apple Fruit Miner (Argyresihia conjugella Zeller). — Occurs in 

 western portions of Canada and the U. S. 



Adult. — One-half inch spread; fore wings purplish-grey mottled with 

 brown, with a row of small white and brown dots on front margins and 

 a broad white interrupted band. May- June. 



Larva. — Pinkish-white; % inch long; burrows in all directions 

 through fruit. Also on wild crab. 



Pupa. — In white cocoon with open pattern, under bark or leaves. 



White Cedar Twig Borer {Argyresthia thuiella Pack.). — Causes a 

 rusty appearance on white cedars along the Ottawa. 



Adult. — A small pearly white moth with costal and apical brownish 

 spots; head and thorax white; antennae white with brown rings. Latter 

 half of June. 



Larva. — Slender, olive green, brownish at anal end; head black and 

 shining; thoracic shield piceous; 3^^ inch long before winter sets in; 

 hibernates in mines made in the young twigs; renews growth at end of 

 May and is 3>'4 inch long when full grown in June. 



Pupa. — ^No cocoon; formed in the mines. 



The Apple Ermine Moth (Yponomeuta malina) and the Cherry 

 Ermine Moth (Yponomeuta padella L.) are destructive orchard pests 

 in Europe. They reached the U. S. in 1914 on nursery stock imported 

 from France into New York State, and were discovered in shipments of 

 ornamental shrubs and fruit seedlings into New Brunswick in 191 7. 



The moths are small, about f-^ inch wing expanse; fore wings white 

 with black dots; hind wings grey and broadly fringed. The caterpillars 

 are about % inch long and vary in color from pale to greyish or greenish 

 brown. The moths fly during July and August; the eggs hatch in the 

 fall and the young larvae hibernate beneath the scaly covering formed 

 by the egg-masses. 



