546 INSECT PESTS OF FARM, GARDEN AND ORCHARD 



general hue. Hind-wings dark gray; cilia with a rufous tinge. " 

 The full-grown larva is one- third inch long, somewhat flattened, 

 and tapers from the broad thorax to the last segment. It is 

 light green except the back of the prothorax and the anal seg- 

 ment, which are brown. 



Life History. The moths emerge in late April in Delaware and 

 in May in Connecticut. The small greenish-yellow, blister-like 



eggs are elliptical in outline, about one- 

 fiftieth inch long, and are attached 

 closely to the surface of the leaf. They 

 hatch in from eight to t e n days and 

 the young larvae mine directly into the 

 leaf from the under side of the eggs. 

 The larvae become full grown in about 

 three weeks and pupate in their mines, 

 the pupal stage lasting eight to ten 

 days. Thus the whole life cycle re- 

 quires but about thirty-three days in 

 the District of Columbia, where there 

 are four generations a year, and about 

 six weeks in Connecticut, where there 

 are but two generations. The larvae 

 of the last generation line their mines 

 with silk and in them pass the winter 

 in the fallen leaves, transforming to 

 pupae the next spring. 



Control. As the larvae pass the win- 

 ter in the fallen leaves, the insect may 

 be entirely controlled by plowing 

 under the leaves in late fall or early 

 spring or by raking them up and burn- 

 FIQ. 479." Trumpet-shaped ing them. When the larvae become so 

 mine of the apple leaf-miner abundant as to threaten serious injury 

 (Tischeria motif oliella Clem.) . . r i 'ii j 



(Photo by Quaintance, U. S. in summer they may be killed in 

 Dept. Agr.) their mines by spraying the foliage 



with 10 to 15 per cent kerosene emulsion, but this is not satis- 

 factory in the early fall. 



