THE MONTHLY BULLETIN. 



171 



Distribution. — Throughout the entire State, excepting in the north- 

 ern coast counties where peaches are not grown extensively. Particu- 

 larly harmful in the Sacramento and San Joaquin valleys. 



long, 

 enter 

 work 



Fig. 155. — The web spun across the chamber 

 occupied by the pupa of the peach twig-borer in 

 summer. This web is spun by tlie larva and is 

 a quiclt and sure way of locating the pupa. 

 (Original.) 



Food Plants. — The larva? work in the early spring upon the young 

 buds and shoots and during the summer on these, and on the fruit. The 

 twigs are also attacked. In all cases the larva* enter near the tip 

 and work toward the base, During 

 the early spring the young start- 

 ing huds are often killed before 

 they are more than two inches 

 In attacking the fruit they 

 at the stem end and may 

 completely around the pit, 

 thus causing rapid decay and com- 

 plete ruin. ' 



Control. — Though once a most 

 serious pest, control methods have 

 been perfected which make it no 

 longer a menace to the peach 

 grower. These consist of a 

 thorough application of lime-sul- 

 phur spray when the blossoms 

 begin to open. Spraying when the 

 trees are in full bloom is preferable to an application before the blossoms 

 begin to appear. The commercial preparation diluted one part to 

 ten of water and applied as a strong spray under a pressure of from 

 150 to 200 pounds is found to give excellent results. Mr. Chas. B. 

 Weeks, horticultural commissioner of Tehama County, has been using 

 this formula for a number of years and finds it satisfactory in every 

 way. 



156. — Tlie peach twig-borer, 

 a, new shoot kille:! by larva early 

 in the spring ; b, larva ; c, pupa ; d, 

 tip of same. All enlarged. 

 Dept. Agrcl.) 



(U. .S. 



