﻿EFFECTS ON BONEYBEES OF SPEAYING FRUIT TREES 



21 



Table 6 clearly shows that the spraying did not affect the daily 

 mortalities of the bees experimented with. 



Table 6. — Summary of results obtained by weighing honeybees at Winchester, 

 Va., 1915 and 1916; Fennville, Mich., 1916 ; and Drummond, Md., 1917 







Number of days before spraying 





9 



8 



7 



6 



5 



4 



3 



2 



1 





Loss, as indicated by 

 actual weights at— 

 Fennville, 1916 



P. ct. 



P.ct. 



P.ct. 



P.ct 



P.ct. 



P.ct. 

 7.50 

 9.88 



17.82 



P. ct. 



7.56 

 13.48 

 18.50 



P.ct. 

 15.55 

 18.43 

 22. 11 



P.ct. 

 18.11 



Accu- 

 mula- 

 ted i 



Winchester, 1916_._ 

 Drummond, 1917. _ 



Average... . ... 



1.51 

 6.70 



3.94 

 9.78 



1.76 

 11.51 



4.69 

 15.70 



. 2.85 

 15.56 



27.97 

 25.92 



daily 



4.10 

 2.38 



6.86 

 4.76 



6.63 

 7.14 



10.19 



9.52 



9.20 

 11.90 



11.73 

 14.29 



13.18 

 16.67 



18.70 

 19.05 



24.00 



loss 



Theoretical loss, 

 based on 6 weeks as 

 normal life of bees 



21.43 







Number of days after spraying 





11 



2 



3 



4 



5 



6 



13 



20 



27 



34 





Loss, as indicated by 

 actual weights at — 



Fennville, 1916 



Winchester, 1916.— 

 Drummond, 1917. _ 



Average 



Theoretical loss, 

 based on 6 weeks as 

 normal life of bees. . 



Loss, as indicated by 

 actual weights at 

 Winchester, 1915 



P.ct. 

 27.30 

 29.06 

 20.04 



P.ct. 



27.92 

 33. 50 



27.84 



P.ct. 



30.98 

 31.34 

 27.89 



P.ct. 

 38.54 

 40.70 

 29.00 



P.ct. 

 40.35 



42.88 

 31.45 



P.ct. 



P.ct. 



P.ct. 



P.ct. 



P.ct. 















Accu- 



35.02 



41.76 



47.06 



53.90 



60.26 



mula- 



25.47 

 23.80 



29.75 

 26.19 



31.07 



28. 57 



36.08 

 30.95 



38.23 

 33.33 













ted \ 

 daily 

 loss 



35.71 



52.38 



69. 05 



85.71 



100.00 





18. 60 



25.58 



28.84 



31.40 



34.65 



35.35 























' Day on which spras^ing was done or begun. 



INTERPRETATION OF RESULTS 



It is to be expected that the bees carried increasing quantities in 

 their honey sacs from day to day as the honey flow increased, owing 

 to the beginning of such activities as wax secretion and the evapora- 

 tion of nectar, and that they carried decreasing quantities from day 

 to day as the honey flow declined toward its close. This is verified 

 in a general way by the weights of samples of a known number of 

 bees taken in colony No. 6 previous to, during, and after the honey 

 flows (Tables 3 to 5). For this reason it is to be supposed that the 

 appai-ent loss in number of bees, as indicated by the weights, is less 

 than the actual loss during the beginning of the honey flow and 

 greater than tlie actual loss at the close of the honey flow. This is 

 verified by the weight records (Table 3) obtained at Winchester in 

 101 G, previous to (April 27 to 29) and during the honey flow (April 

 30 to May 5), and after its close (May 6 to 12). ITsing the average 

 weight (0.0008 gram) per individual' bee in the hives on April 28, 

 just before the honey flow started, <lie average weiglit (0.1195 gram) 

 on May 2, at the height of tlie honey flow, and the average weight 

 (0.1008 gram) on May 12, after tlie'close of tlie honey flow, it fol- 

 lows (liat, sine:; there are 28.350 gi-ams per avoii'(hipois ounce, an 



