444 



INJURIOUS AND BENEFICIAL INSECTS OP CALIFORNIA. 



habits of this insect, covering the past two years, has led him to believe 



that there is generally but one rather uneven brood a year. The writer 



has followed his work closely and shares his view. 



The adults of the hibernating larvae, emerging in May and June, at 



once begin egg-laying and the young of this brood, instead of attacking 



fruit, as is generally supposed, 

 begin at once to construct hiber- 

 naculae, where they remain through- 

 out the remainder of the summer 

 and over winter. Mr. Weldon has 

 found these newly constructed 

 chambers as early as May 19th in 

 Ventura County, and from then on 

 until July, after which few if any 



Fig. 451. — The peach twig-borer, An- 

 arsia Uneatella Zeller. Top : a, limb 

 showing location of the hibernaculse ; b. 

 chimneys thrown up in constructing the 

 hibernaculse. enlarged ; c, larva in the 

 hibernacula ; d, larva, enlarged. Bottom : 

 a, young spring shoot killed by the larva ; 

 6, larva ; c, pupa ; d, posterior tip of 

 pupa. Lines show natural sizes. (After 

 Marlatt, U. S. Dept. Agric.) 



Fig. 452. — Web spun across the en- 

 trance of the retreat of the pupa of the 

 peach twig-borer, Anarsia Uneatella 

 Zeller. These are abundant upon the 

 peach trees in the months of May, June 

 and July. (Author's illustration, Mo. 

 Bui. Cal. Hort. Com.) 



are made. Perhaps a few larvae mature before winter and may give 

 rise to a partial second brood, but if so it is very fragmentary and of 

 little importance. 



Nature of Work. — The larvae work in the early spring upon the 

 young buds and shoots and during the summer on the same, as well as 

 on the fruit. The twigs are also attacked. In all such cases the larvae 

 enter near the tip and work toward the base. During the early spring 

 the young starting buds are often killed before they are more than two 

 inches long. In attacking the fruit they enter at the stem end or 

 side and may work completely around the pit, thus causing rapid 

 decay and complete ruin. 



