156 AGRICULTURAL EXPERIMENT STATION. 



Eggs — pale 3'ellow, varied, with one end flattened, irregularly 

 ribbed and 0.02 of an inch long. 



Larva — soft, flesh-like, pale yellow ; head small, deeply set ; jaws 

 black ; third segment twice as broad as an}' of the posterior ones, 

 and bearing on its upper surface a large oval callous like projection 

 covered with numerous raised brown points. (Fig 2, a and c.) 



Chrysalis — lighter colored than the larva and with transverse rows 

 of minute spines on the back and a few at the extremity of the 

 body (Fig. 2, b.) 



LIFE HISTORY. 



The beetle makes its appearance in June or July in our latitude 

 and lays probably about one hundred eggs. The female fastens the 

 eggs, singly or in groups, to the loose flakes of bark or in the crev- 

 ices, by means of a glutinous substance. The eggs soon hatch and 

 the young worms gnaw through the bark and live on the sap wood 

 making flat channels next to the bark, sometimes girdling the tree. 

 As they get older they bore upward into the solid wood and when 

 ready to change to the chrysalis gnaw to the bark and nearly through 

 it. It then changes to the chrysalis (Fig. 2, b), and in about three 

 weeks the beetle comes forth. The larva attacks the trunk and 

 larger branches and is supposed to remain in the tree but one year. 



REMEDIES. 



Examine the trees early in the fall for dark flattened spots, exu- 

 dation of sap, or sawdust-like coatings, and if found remove the 

 worm with a knife. 



Catch and kill the beetles when possible. Paint the trunk and 

 larger branches with the solution recommended for the round-headed 

 borer. 



Keep the trees as vigorous and healthy as possible as this borer 

 prefers sickly trees and those recently transplanted or too severely 

 pruned. 



Remove the flakes and moss from the trunk and keep it as smooth 

 as possible. This beetle is said to be worse in high, sandy soil than 

 in rich, low ground. Anything that tends to give vigor to the tree 

 lessens the danger of attack. 



