THE CALIFORNIA PEACH BORER. 



79 



EARLIEST, MAXIMUM, AND LATEST APPEARANCES OF MOTHS. 



The first moth during the season of 1908 was found resting on an 

 apricot leaf near the crotch of a tree on April 16, and on May 15 

 another was seen in a similar position. On these same days two or 

 three empty cocoons were found, which indicated that other moths 

 had also emerged. The data in Table V indicate the period when 

 moths are flying. 



Table V. — Records of emergence of moths of the California peach borer, 1908-9. 



1908 record, Kelly orchard, 35 trees. 



1909 record, Henly orchard, 19 trees. 



Date. 



Males. 



Females. 



Total. 



Date. 



Males. 



Females. 



Total. 



June 6 



2 

 1 

 4 

 9 

 9 

 9 



10 

 8 

 8 

 6 



10 

 

 1 

 

 



1 

 5 

 2 

 2 

 1 



11 



10 



12 



11 



13 



10 



3 



3 



1 







3 



6 



_ 6 



11 



10 



20 



20 



20 



19 



19 



20 



3 



4 



1 







July 1 



3 

 3 



4 

 8 

 2 

 1 

 5 

 3 

 7 

 3 

 

 1 

 

 1 





 

 1 



6 



2 

 3 

 1 

 8 

 5 

 1 

 

 1 

 1 

 



3 



15 



7 



3 



23 



14 



5 



29 



21 



14 



July 5 



28 



4 



13 



Aug. 4 



4 



20 



11 



6 



27 



18 



11 



31 



25 



12 





Sept. 3 



4 



10 



10 







17 



17 



2 



27 



24 



1 



Sept. 7 



30 



1 



15 



Total 









Total 



77 



85 



162 



41 



29 



70 



These records of emergence of moths for the two seasons of 1908 

 and 1909, respectively, were taken from series of wire-mesh traps 

 (PL X, fig. 2), which were placed around the lower trunks of 

 apricot trees. During the season of 1908 the records were made in 

 an uncultivated orchard about 3 miles from San Jose. Tliirty-five 

 wire cages were placed around as many trees, and the moths which 

 emerged were collected at regular intervals of a week, except that 

 they were collected every two or three days during the period of 

 maximum emergence. The records for the season of 1909 represent 

 moths collected from the cages which had been placed around apricot 

 trees in another orchard. 



A perusal of the table indicates that an average of 5 moths emerged 

 from each of the 35 traps during the season of 1908. An average of 

 8 moths per tree and a maximum of 27 moths from a single tree were 

 recorded during the season of 1909. The record of 1908 shows an 

 emergence of more females than males, and the records of the fol- 

 lowing year just the opposite. This fact probably has no special 

 significance, since the totals in either case are not sufficiently large 

 to be of value in determining the relative number of either sex. A 

 few moths are thus to be seen flying in April and May and many more 

 during July and the first half of August. A few late individuals 

 appeared during September. 



