CODLING MOTH IN COLORADO. 



87 



Table LXIII. — Emergence of codling moths of the first brood, hourly, from 

 6 a. m. to 6 p. m., Grand Junction, Colo., 1916. 



Date of 

 emer- 

 gence 

 of moths. 



Ob- 

 serva- 

 tion 

 No. 



Number of moths emerging at — 



Total 

 num- 

 ber 

 of 

 moths. 



A. M. 



P.M. 



6 7 



8 



9 



10 



11 



6 



13 



9 



5 



9 



32 



15 



5 



18 



4 



4 



6 



7 



20 



4 



16 



27 



5 



1 



12 



5 



11 



12 



2 



8 



21 



5 



12 



16 



1 



2 



4 



8 



1 



2 



15 



25 



9 



2 



1 



2 



3 



2 

 6 

 4 

 1 



13 



16 

 1 



22 

 9 

 4 



12 



35 

 8 

 3 



13 

 1 

 8 

 8 



11 



4 



5 



6 



5 



7 



5 



5 



5 



2 



32 



25 



21 



6 



July 17 

 18 

 19 

 20 

 21 

 22 

 23 

 24 

 25 

 26 

 27 

 28 

 29 

 30 

 31 

 Aug. 1 

 2 

 3 

 4 



Total . . 



1 

 2 

 3 

 4 

 5 

 6 

 7 

 8 

 9 

 10 

 11 

 12 

 13 

 14 

 15 

 16 

 17 

 18 

 19 





3 

 ..... 



1 

 9 

 8 

 8 

 1 

 4 

 2 

 8 



19 

 2 

 4 

 8 

 12 

 10 

 7 

 4 



6 



11 



7 



1 



13 

 20 

 25 



"io" 



3 



6 

 26 



5 

 26 

 12 

 20 

 11 



4 



7 



1 

 7 

 4 

 7 



11 



12 

 5 



16 

 6 

 5 

 4 

 9 



16 

 3 



20 



18 

 9 



22 

 3 



5 

 9 

 8 

 8 



12 

 9 

 4 



10 

 ..... 



11 

 16 

 15 



4 

 16 

 10 



7 

 13 



2 



4 



3 

 11 

 12 

 10 

 10 



2 

 15 

 11 

 18 



6 



30 

 13 



7 

 10 



6 



5 

 13 



3 



3 

 3 

 3 



8 

 1 

 4 

 3 

 6 

 8 

 9 



41 



69 



71 



53 



96 



141 



76 



119 



111 



77 



68 



167 



94 



91 



103 



117 



110 



97 



60 







1 



1 

 1 

 1 



1 

 .... 



4 

 2 



"2 

 3 



2 



2 



3 

 3 

 9 



1 

 1 

 4 

 7 

 5 

 1 

 1 

 1 



1 

 1 

 1 



"5' 



18 

 11 

 10 

 5 

 11 

 4 

 9 

 9 



3 



7 

 7 

 6 

 2 



"2 

 17 



1 

 2 





"3" 



1 



1 

 "3 









44 



17 15 



114 



213 



206 161 1-78 



165 



177 i 189 



190 



92 



1,761 





















CODLING-MOTH FLIGHT TRIALS. 



In connection with the habits of the codling moth, the question, 

 " How far does the codling moth fly ? " has frequently been asked, but 

 it has not been possible to answer this query definitely on account of 

 the lack of satisfactory data. It is generally conceded by the fruit 

 growers of the Grand Valley that the codling moth migrates to a 

 certain extent. They have observed that the outside rows of their 

 orchards frequently have a greater percentage of wormy fruit, which 

 they attribute to the immigration of moths from near-by orchards. 

 It has also been found that the fruit on trees in the vicinity of the 

 packing houses is, as a rule, quite wormy, due to the migration of the 

 moths from the packing houses. 



According to the observations of the writers, it is believed that the 

 codling moth does not migrate long distances in a continuous flight, 

 but by means of short flights may proceed from one tree to the next 

 or fly across a road from one orchard to the adjoining or from the 

 packing house to the neighboring trees, or occasionally fly a few hun- 

 dred feet from one orchard to another. The normal flight, however, 

 is restricted, as my be noted about dusk, when the moths are most 

 active and may be seen flitting about in a tree or flying from one tree 

 to another near by. 



Perhaps the strongest evidence that the moths do not migrate in 

 large numbers to any considerable extent was noted in 1915, when 

 only a few smudged orchards, outside of the Palisade district, had a 

 fruit crop. While the apples in these protected orchards were quite 



