134 



FRUIT INSECTS 



examined for egg-masses and the eggs killed by saturating 

 them with crude coal-tar creosote to which a little lampblack 

 has been added as a marker. The work of destroying the eggs 

 can be greatly facilitated by having the trees properly pruned, 

 by removing all flakes of rough bark and by filling all cavities 

 with cement or covering them with tin. The trees should be 

 sprayed, soon after the eggs have hatched, with arsenate of lead, 

 10 pounds in 100 gallons of water. If the caterpillars are half- 



Fig. 147. — Orchard defoliated by gipsy moth caterpillars, in July. 



grown, it is advisable to use 13 or 15 pounds. It is very 

 difficult to poison nearly full-grown caterpillars, and for the 

 best results the spraying should be done while the caterpillars 

 are small. If the orchard is located near untreated woods or 

 other orchards the trees should be banded with tanglefoot to 

 prevent the ascent of caterpillars migrating from the untreated 

 area when the food supply runs short (Fig. 146). 



References 



Forbush and Fernald, The Gipsy Moth, Boston, 1896. 

 U. S. Dept. Agr. Farmers' Bull. 275. 1907. 



