INSECTS AFFECTING PARK AND WOODLAND TREES 3O3 



Description. The adult insect is a rather slender, four winged wasplikc 

 creature with a wing^ spreatl of nearly i inch and a body length of a little 

 more than yi inch. It .is black, excepting the broad orange band at the 

 base of the abdomen. The larva or borer is about ^ inch long when full 

 grown, legless, white, and with the thoracic segments slightly thickened. 



Life history. The adult is abroad in early spring, and after deposit- 

 ing her eggs in a shoot, the female proceeds to girdle the stem below 

 the point of oviposition, in order to prevent its further growth and thus 

 protect the eggs from being crushed. The larvae gradually work their 

 way downward through the pith a distance of two feet or more, and by 

 the beginning of November have completed their growth and filled the 

 lower ends of their burrows with frass or castings. They then gnaw a 

 passage to the bark through one side of the shoot a little above where the 

 pupal cell is to be formed. Within the latter they construct a delicate, 

 transparent, cylindric cocoon in which they winter. The transformation to 

 the adult occurs the following spring. 



Remedial measures. The wilting shoots are an early sign of injury, 

 and where the expense is not too great, the insect can be easily controlled 

 by cuttmg them off below the injured point and allow them to drop to the 

 ground. This procedure prevents the further development of the insect 

 and affords parasites, if present, an opportunity to escape. 



Bibliography 



1904 Chittenden, F. H. U. S. Dep't .Xgric. Bur. For. Bui. 46, p. 68-70 



Black walnut caterpillar 

 Datana intcgcrrinia Grote & Robinson 

 Reddish, white striped or blackish, white haired caterpillars, from Y^ to 1^2 inches 

 in length, feed in large clusters in midsummer on black walnut, butternut and other 

 trees. 



This species is the more common one of the genus found in New York 

 State on black walnuts and hickories. It has been brought to the writer's 

 attention a number of times during recent years, and in 1902 he observed 



