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 



12 



1 



2 



3 



4 



5 



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 



4 

 1 

 9 

 8 

 8 

 1 

 4 

 2 

 8 

 19 

 2 

 4 

 8 

 12 

 10 

 7 

 4 



6 



11 



7 



1 



13 

 20 

 25 



10 



3 



6 



26 



5 



26 



12 



20 



11 



4 



7 



6 

 13 

 9 

 5 

 9 

 32 

 15 

 5 



18 

 4 

 4 

 6 

 7 

 20 

 4 

 16 

 27 

 5 

 1 



5 



11 



12 



2 



8 



21 



5 



12 



16 



1 



2 



4 



8 



1 



2 



15 



25 



9 



2 



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 



6 

 11 

 16 

 15 



4 

 16 

 10 



7 

 13 



2 



2 

 6 

 4 

 1 



13 



16 

 1 



22 

 9 

 4 



12 



35 

 8 

 3 



13 

 1 

 8 

 8 



11 



4 



3 

 11 

 12 

 10 

 10 



2 

 15 

 11 

 18 



6 

 30 

 13 



7 

 10 



6 



5 

 13 



3 



6 



5 



7 



5 



5 



5 



2 



32 



25 



21 



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 



178 



165 



177 



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 



