44 



BULLETIISr 189^ U. S. DEPARTMENT OF AGEICULTUEE. 



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. 



Loeality. 



Year. 



Distance north of 

 Charlottesville. 



Degrees 



and 

 minutes. 



Miles. 



Number 

 of daj-s 

 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 

 larvae 

 under 

 bands. 



First 

 summer- 

 brood 

 moths. 



Charlottesville, Va... 



Greenwood, Va 



Hagerstown, Md 



"Winchester, Va 



Fishersville, Va 



French Creek, W. Va 

 Pickens, W. Va 



4 



1 40 

 1 10 

 4 

 50 

 40 



5 

 115 

 80 



5 

 60 

 45 



Same day 



7 



23 



7 



27 



8 



15 



8 



18 



11 



11 



11 



15 



15 



6 



15 



18 



34 



37 



34 



67 



RELATIVE NUMBERS OF LARV^ 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 larvse 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 larvse 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 larv« 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. 



Number of larva; collected. 



On tnmk. 



On 



branches. 



Total. 



Per cent. 



On trunk. 



On 

 branches. 



Hagerstown, Md 



Smithsburg, Md 



Hancock, Md 



Fishersville, Va 



French Creek, W. Va 

 Pickens, W . V a 



Total 



543 

 179 

 75 

 96 

 146 

 29 



602 

 619 

 .91 

 68 

 96 

 30 



1,145 

 798 

 166 

 164 

 2-12 

 59 



47.42 

 22.44 

 45.18 

 58.54 

 60.33 

 49.15 



52.58 

 77.56 

 54.82 

 41.46 

 39.67 

 50.85 



1,068 



1,506 



2,574 



41.49 



58.51 



