138 INSECTS OF ECONOMIC IMPORTANCE 



The eggs are laid in May beneath the epidermis 

 of the leaves and the larvae mine in the tissues of 

 the leaf making large irregular mines or "blisters" 

 in the leaves; they become mature in July and go 

 into the ground where they make thin papery co- 

 coons and remain in them until next spring; they 

 then change to pup?e and the flies appear in May; 

 only one generation. 



Control — Spray the leaves just as the mines be- 

 gin to show, about first of June, with nicotine sul- 

 phate, I pint to lOO gallons of water with 5 pounds 

 of soap. 



The WHITE-MARKED TUSSOCK-MOTH ^ {HcmCVO- 



campa leiicostigma) 

 Order — Lepidoptera. Manual, p. 310 



The tussock moth is a native insect that is very 

 injurious at times to shade-trees and fruit-trees; 

 the larva is very striking in appearance; it is two 

 inches long and bears four tufts or tussocks of 

 creamy white hairs on its back with two long pen- 

 cils of hairs on its head and a third on the posterior 

 end of the abdomen. 



The moth lays its eggs in whitish masses in sum- 

 mer on the trees ; they remain here until the follow- 

 ing spring and then hatch into the caterpillars that 

 strip the trees of foliage; these caterpillars often 

 migrate from tree to tree; when full-grown they 

 make cocoons on the trees and change to pupae ; one 

 brood a season except in extreme southeastern part 

 of State. 



Control — Collect ^gg masses during fall and 

 winter ; spray trees with arsenate of lead, 3 pounds 

 to 50 gallons ; band trees with cotton in June, July, 

 and August. 



3 Howard— U. S. Dept. Agr., Par's' Bull. 99. 



