174 



JOURNAL OP ECONOMIC ENTOMOLOGY 



[ToL 3 



and 81.02 per cent, respectively, of wormy fruit. The apples were 

 picked October 5 to 7 and the remaining windfalls and all on the 

 trees carefully sorted, and these figures, combined with those obtained 

 earlier in the season, were brought together in the following table. 



SUMMARY OF PLOTS 



Bearing in mind that plots 1 to 3 were sprayed Avith Vermorel 

 nozzles and 4 to 6 with Bordeaux nozzles, as described above, it will 

 be seen that in each of these groups there is a successive decrease in 

 the number of wormy fruit obtained from the various plots. This, 

 while apparently significant, has no bearing upon the problem, since 

 there is a similar decrease in the total number of fruit upon the trees 

 of the various plots. The percentages of clean fruit or the percent- 

 ages of wormy fruit, it will be seen, are remarkably uniform for each 

 of the six plots, showing that so far as this orchard is concerned 

 under conditions obtaining the past season, there was very little 

 difference between treatment with a coarse driving spray applied at 

 a relatively high pressure and a finer spray which under no conditions 

 could be driven with much force. Furthermore, it is impossible from 

 a study of the percentages, to find any very marked benefit from the 

 second and third applications unless it be in the case of the treat- 

 ments with the Bordeaux nozzle. Even then the latter only approxi- 

 mate and hardly exceed the results obtained with the Vermorel nozzle. 

 As pointed out before, it was found much more difficult to cover a 

 tree thoroughly with the Bordeaux than with the Vermorel nozzle. 

 Reference to the check trees shows a material benefit accruing from 

 even one application, since the sprayed plots gave at least 98.55 per 

 cent of worm free fruit, while the unsprayed or check trees produced 

 but 72.73 per cent of worm free fruit. 



