THE PEAK THRIPS IN CALIFORNIA. 



33 



Table IV. — Total emergence of pear thrips from all the cages kept at the laboratory at 

 San Jose, Santa Clara County, Cal., during 1909, 1910, 1911, and 1912. 





Number 



Number 



Number 



Number 





Number 



Number 



Number 



Number 





of thrips 



of thrips 



of thrips 



of thrips 





of thrips 



of thrips 



of thrips 



of thrips 



Date 



emerging 



emerging 



emerging 



emerging 



Date. 



emerging 



emerging 



emerging 



emerging 



in 1909 



in 1910 



in 1911 



in 1912 





in 1909 



in 1910 



in 1911 



in 1912 





from 18 



from 18 



from 4 



from 4 





from 18 



from 18 



from 4 



from 4 





cages. 



cages. 



cages. 



cages. 





cages. 



cages. 



cages. 



cages. 



Feb. 1 











2 



1 



Mar. 9 



776 



144 



1 



366 



2 











7 



1 



10 



497 



100 



32 



442 



3 



















11 



498 



73 



54 



81 



4 



















12 



338 



179 



71 



83 



5 















1 



13 



313 



45 



56 



161 



6 











1 



5 



14 



248 



20 



22 



313 



7 











28 



3 



15 



279 



7 



17 



433 



8 











5 



6 



16 



259 



4 



9 



239 



9 







25 



1 



9 



17 



152 



20 



2 



158 



10 







18 



4 



9 



18 



42 



7 



4 



596 



11 







16 



1 



9 



19 



61 



2 







209 



12 







16 



22 



21 



20 



28 



2 







144 



13 







4 







15 



21 



2 







3 



106 



14 







88 







33 



22 



6 







6 



114 



15 



18 



22 



11 



37 



23 



13 







1 



103 



16 







27 



5 



65 



24 



3 







1 



68 



17 



52 



34 



2 



104 



25 



2 











52 



18 



192 



33 



17 



242 



26 



3 







1 



39 



19 



192 



14 



62 



490 



27 



7 







1 



38 



20 



169 



23 



41 



384 



28 



7 











61 



21 



75 



62 



32 



325 



29 















17 



22 



119 



129 



33 



440 



30 



2 











14 



23 



135 



375 



25 



422 



31 















14 



24 



552 



272 



26 



515 



Apr. 1 



3 











28 



25 



459 



297 



18 



800 



2 















19 



26 



444 



455 



8 



504 



3 



1 











9 



27 



414 



574 







762 



4 















7 



28 



781 



657 







1,694 



5 















4 



29 

 Mar. 1 









1,169 

 1,721 



6 



7 





 





 





 



4 

 26 



781 



1,975 







2 



535 



3,592 







276 



8 















5 



3 



1,299 



3,011 



2 



284 



9 















3 



4 



714 



4,217 



4 



399 



■10 















1 



5 



508 



1,402 







400 



11 















1 



6 



362 



1,595 







585 



12 



















7 



8 



438 

 219 



539 



275 



1 



21 



1 227 













l'052 



Total. . 



11,998 



20, 350 



660 



17, 968 



Table V. — Emergence of pear thrips from cages placed in ground under trees in pear and 

 prune orchards, Walnut Creek, Contra Costa County, Cal. 





Number of 





Number of 



■ Date. 



thrips 



Date. 



thrips 





emerging. 





emerging. 



1909. 





1910. 





Feb. 13 







Feb. 21 



1 



16 



20 



23 



4 



19 



37 



25 



23 



22 



30 



27 



36 



26 



110 



Mar. 1 



56 



Mar. 2 



615 



3 



237 



5 



679 



5 



1,170 



10 



752 



7 



2,110 



12 



273 



9 



892 



16 



65 



11 



1,773 



20 



33 



13 



557 



22 



4 



15 



198 



27 



11 



17 



71 







19 



3 







21 



6 







27 



5 



