PACKARD.] THE POPULATION OF AJST APPLE TEEE. 181 



is a smooth, fat, green "worm, ■with two eye-like spots beliind 

 the head. It changes to a chrysalis in August. These 

 three caterpillars do little or no harm to the tree, and are 

 only mentioned on account of their large size and curious 

 appearance. 



The Apple Nola. — We have not ourselves identilled the 

 caterpillar of this well known moth. It is said by Di'. Fitch 

 to be a rather thick, cylindrical, light green worm, an inch 

 long, with five white lines and numerous white dots', and 

 was observed eating notches and lioles in the leaves. It 

 changes to a cocoon in a curved leaf. The moth appears 

 in Julj', and also hibernates, flying about in spring. It 

 is gray, crossed by three zigzag black lines. It is the Nola 

 vicdana. 



The Bud Worm. — One of the most injurious insects of 

 the apple tree, nesit to the canker worm, that we have, is 

 a small, reddish-brown larva, which, during certain years, 

 threatens, in some localities, the extinction of our apple 

 crop. It was described by Harris, in his "Treatise on the 

 Insects injurious to Vegetation," under the name of Penthina 

 ocidcnia, and should now be named Grapholitha oculana. 

 The caterpillar is a small, cylindrical, naked worm, about a 

 third of an inch in length, and of a uniform reddish-brown, 

 with small warts, from which ai'ise short, fine hairs, while 

 tlie head and upper side of the prothoracic ring, or segment 

 next the head, is black. 



On May 16th I noticed this caterpillar on the apple, and 

 also the pear and cherr}-, perforating the half expanded leaf 

 and flower buds. They were very abundant on these buds, 

 and afterw-ards, when the leaves had partially expanded, 

 they had folded them. It seems to hatch out about the 

 time that the canker worms and American tent catorpiUars 

 leave their eggs, that is, about the first daj^ of Ma}', when 

 the buds unfold. The last of May and the first week of 

 Ji«ic they were swax'miug in orchards throughout eastern 



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