44 



BULLETIN 189, U. S. DEPARTMENT OF AGRICULTURE. 



Table XL. — Effect of differences in altitude and latitude on the time of appearance of 

 spring-brood and first-brood codling moths and first-brood larvse — Continued. 



Locality. 



Year. 



Distance north of 

 Charlottesville. 



Degrees 

 and 



minutes. 



Miles. 



Number 

 of days 

 later 

 than 

 Char- 

 lottes- 

 ville 

 accord- 

 ing to 

 law of 

 latitude 



and 

 altitude. 



Actual number of days later 

 than Charlottesville. 



First 

 spring- 

 brood 

 moths. 



First 

 larva? 

 under 

 bands. 



First 

 summer- 

 brood 

 moths. 



Charlottesville, Va... 



Greenwood, Va 



Hagerstown, Md 



Winchester, Va 



Fishersville, Va 



French Creek, W. Va 

 Fickens, W. Va 



1912 

 1913 

 1912 

 1913 

 1912 

 1913 

 1912 

 1913 

 1912 

 1913 

 1912 

 1913 

 1912 

 1913 



4 



1 40 

 1 10 

 4 

 50 

 40 



5 

 115 

 80 



5 

 60 

 45 



Same day 



RELATIVE NUMBERS OF LARVAE ASCENDING AND DESCENDING THE 



TREES. 



In 1911 several trees in a number of orchards were banded around 

 the trunks and also around the bases of the larger branches. The 

 lower bands were used to secure larvae that had dropped with the 

 infested fruit and ascended the trunk to spin up, and the upper 

 bands were used for those that left the fruit before it dropped and 

 descended toward the trunk for the same purpose. The following 

 table shows the relative number of larvae secured under the two sets 

 of bands in the six orchards. In considering Table XLI due allow- 

 ance should be made for an unknown number of larvae that crawled 

 across the bands or that spun up under the bark before reaching the 

 bands. 



Table XLI. — Relative numbers of codling-moth larvse collected from bands around the 

 trunks and bases of branches, season of 1911. 



Locality. 



Hagerstown, Md 



Smithsburg, Md 



Hancock, Md 



Fishersville, Va 



French Creek, W. Va 

 Fickens, W. Va 



Total 



Number of larva? collected. 



On trunk. 



543 

 179 

 75 

 96 

 146 

 29 



1,068 



On 

 branches. 



619 

 91 



30 



1,506 



Total. 



166 



164 



242 

 59 



2,574 



Per cent. 



On trunk. 



47.42 

 22.44 

 45.18 

 58.54 

 60.33 

 49.15 



41.49 



On 

 branches. 



52.58 

 77.56 

 54.82 

 41.46 

 39.67 

 50.85 



58.51 



