142 



INSECTS AFFECTING SHADE TREES. 



The second brood of larvae are much more numer- 

 ous, and consequently more destructive, than the first. 

 Although maple forms the favorite food-plant of the 

 insect, it is occasionally found upon oaks and a few 

 other trees. The larvae are preyed upon by various 

 insectivorous birds, and by several insect parasites. 



Remedies. — Spraying with London purple or 

 Paris green early in the season, just after the worms 

 hatch, is the most effective remedy for this insect. 



The Walnut Caterpillar. 



Datana angusii. 



The leaves of walnut and butternut trees are fre- 

 quently eaten during summer by a large, blackish 

 caterpillar. This is the larva of a good-sized moth 

 that makes its appearance from the middle of June 

 to the first of July, and deposits its eggs, seventy to 

 a hundred in a place, on the under surface of the 



Fig. 71. Yellow-necked Apple-worm : a, larva; 6, moth ; c, eggs — 

 all natural size ; d, egg, magnified. 



leaves. In a short time the larva' hatch, and begin 

 feeding upon the foliage. They increase rapidly in 

 size, and in a few weeks attract attention on account 



