THE CALIFORNIA PEACH BORER. 



73 



Table III. — Records of larvse of the California peach borer taken from trees, 1908-9- — 



Continued. 









Num- 



Num- 













Number 





ber of 



ber of 



Total 





Number 





Date. 



of trees 



Kind of 



larvae 



larvae 



number 



Number 



empty 





exam- 



tree. 



small 



half to 



of 



of pupae. 



pupal 







ined. 





to half 

 grown. 



full 



grown. 



larvae. 





cases. 





1909. 



















Feb. 5 



5 



Apricot .... 







19 











Larvae of all sizes. 



Mar. 4 



4 



.do 







87 







1 







Do. 



May 6 









Larvae in cocoon; sec- 

















ond for the season. 



20 



9 



Peach 







9 



9 



1 





Old peach trees only 

 slightly attacked; all 

 larvae in cocoon; 

 third for season. 



21 



1 



Apricot . . . 







12 



12 











All larvae nearly full 

 grown. 



June 4 



Several 



Peach 







20 



20 



7 









6 



2 



Apricot . . . 







33 



33 



1 







Still active larva in 

 just finished cocoon. 



9 



12 



Peach. 







20 



20 







2 



All pupae and empty 

 pupal cases in nearly 

 dead trees. 



10 



20 



...do 







34 



13 



2 



Larvae all nearly full 







" 





grown; 10 pupae and 



















2 empty cases from 



















a nearly dead tree. 



24 



7 



Prune 







20 



20 



26 









26 



10 



...do 







eo 



60 



3 



1 



Prune trees on almond 

 or Myrobalan plum- 

 root stocks, and 

 mostly in good con- 

 dition. 



26 



10 



...do 



7 



47 



54 







1 



Do. 



26 



8 



...do 







76 



76 



53 



Several 



Larvae nearly all full 

 grown; 40 pupae, 13 

 larvae in cocoon, 

 empty pupal cases 

 in nearly dead trees. 



26 



21 



Apricot. . . 







87 



87 



48 



36 



Trees about 8 years 

 old, completely gir- 

 dled; most larvae in 

 crown from surface 

 of ground to 14 to 16 

 inches above; 34 

 pupae, 19 larvae in 

 cocoons. 



28 



10 

 5 



...do 





45 

 20 



45 

 20 



51 

 30 





 16 





July 7 



..do 



Several 



The very few larvae 



















taken were appar- 



















ently of the new 



















brood. 



22 





...do 





14 



14 



2 





Four larvae removed 













from trees began to 



















spin their cocoons 



















July 30, 1909. 



The worming records, so far as they are related to the larval stages, 

 may be summed up as follows: 



Newly hatched and very small larvae were found from early in June 

 to October and November. Half-grown larvae can be found at any 

 time during the year. Larvae which are fully grown during the 

 summer usually transform to moths during late summer or fall, 

 while larvae which are full grown during the fall and winter transform 

 to moths early during the following spring. Larvae more than half 

 grown to full grown are most numerous during the winter and spring. 

 Larvae are apparently active throughout the winter and are never 

 entirely dormant. 



