118 



THE MONTHLY BULLETIN. 



California, apparently free from any attacks. Until within a few years'* 

 the California peach tree borer was thought to exist only in this State 

 and as a pest in only one district. The two recently discovered infesta- 

 tions show that there are possibilities of finding it elsewhere in the 

 future. The first known and the largest infestation occurs in the 

 region of the Santa Clara Valley and extends from Santa Clara County 

 to Alameda, San IMateo, Santa Cruz and San Benito counties. The 

 newer infestations w^ere both located in the southern part of the State 

 and are confined to small districts in two counties. The first was noted 

 in the l-pper O.jai Valley. Ventura County. Just last year County 



MODOC 



L'ap showing the dis- 

 tribution of the Cal- 

 ifornia peach borer, 

 M geria opalescens H. 

 Edw., in California. 

 Jan. 1916. 



Esslg 



Fig. 46. — Showing the distribution of the CaU- 

 fornia peach borer, Aigeriu opalescens, in CaU- 

 fornia. (Original.) 



Commissioner A. A. Brock reported another small district at Bardsdale, 

 across the Santa Clara River from Fillmore. A small infestation at 

 Banning and another at Beaumont, Riverside County, comprise addi- 

 tional infestations in the south. 



The peach tree borer, JEgeria exitiosa Say, of the eastern states was 

 discovered at Dehesa, San Diego County, by H. A. AVeinland" on a few 

 peach trees which were destroyed, and it is believed that tlie infestation 

 was entirely exterminated by the drastic measures taken. Strange to 

 say, this is the only authentic report of the occurrence of this insect 

 in California, and is a ti-ibutc to the thoroughness of the horticultural 

 cjuarantine service. 



^Essig, E. O.. Inj. & Ben. Ins. C'al. 2.1 ((lit., ("al. Ilort. Com., p. 424, 1915. 

 "Essig, E. O., In.i. & Ben. Ins. Cal., 2d edit., Cal. Hort. Com., p. 421, 1915. 



