PLUM INSECTS • 255 



they find their way to the ground, where at a depth of about 

 six inches they pass the winter in earthen cells. Early the 

 following spring the larva works its way up nearly to the sur- 

 face and changes to a pupa just below the grass roots. The 

 adults appear about May 1 in Massachusetts and the second 

 week of June in South Dakota. There is only one generation a 

 year. 



Treatment. 



The larvae are easily killed by a thorough spraying with 

 arsenate of lead, 5 pounds to 100 gallons of water, applied 

 soon after the eggs have hatched and before the large webs are 



made. 



References 



S. D. Agr. Exp. Sta. Bull. 48. 1896. 

 Fletcher, Rept. Ent. for 1896, p. 253. 

 Fernald, Ent. News XIV, pp. 298-302. 1903. 



The Plum Leaf-beetle 

 Nodonota tristis Olivier 



During June and July the foliage of plum, peach, cherry and 

 chokecherry is occasionally attacked by small, shining, steely- 

 blue flea-beetles, about ^ inch in length. The early stages are 

 unknown, but from what is known of the habits of related species 

 the larvae probably live on the roots of plants. Eggs laid in 

 confinement are described as being elongate oval, smooth, 

 dirty whitish-gray in color and about ^V i^^^h in length. They 

 were laid in a mass of 36 in the fold of a leaf and hatched in 

 about a week. 



The injury may be prevented by spraying with arsenate of 



lead, 4 pounds to 100 gallons of water, when the beetles are 



first noticed. 



Reference 



Chittenden, U. S. Bur. Ent. Bull. 19, pp. 93-95. 1899. 



