274 



Comparing thg trees that received three sprayings on May 16, 31, 

 and June 14, we find that two trees treated with London purple at the 

 rate of 1 pound to 200 gallous of water produced 1,615 apples, 27 of 

 which, or 1.4 per cent of the yield, were wormy. The three trees treated 

 with Paris green at the same time and in the same proportion produced 

 2,035 apples of which 36, or 1.5 percent of the yield, were wormy. In 

 this case we have one-tenth of 1 per cent less wormy fruit from trees 

 treated with London purple — practically no difference. 



Three trees that were treated with London purple at the rate of 1 

 pound to 300 gallons of water produced 1,057 apples, 31, or 6.5 per cent, 

 of which were wormy, and three trees treated with Paris green at the 

 same rate produced 2,852 apples, 97 of which, or only 4.6 per cent of 

 the yield, were wormy ; thus showing 1.9 per cent less wormy fruit from 

 the trees treated with Paris green. 



In comparing the fruit from the trees treated at the rate of 1 pound 

 to 400 gallons of water, we find that the two trees treated with London 

 purple i^roduced 806 apples, 39 of which, or 4.5 per cent, were wormy ; 

 and that two trees treated with Paris green produced 4,204 apples, 58 

 of which, or only 1.2 per cent, were wormy ; a difference of 3.3 per cent 

 in favor of Paris green treatment. 



Combining the treatment of each insecticide, we have 4.1 per cent of 

 the yield of the trees treated with London purple that are wormy, and 

 only 2.6 per cent trom trees treated with Paris green ; a difference of 

 1.5 per cent in favor of the Paris green. 



Comparing the fruit from trees treated May 31 and June 14, we obtain 

 the following data : 



The two trees treated with London purple at the rate of 1 pound to 

 200 gallons of water produced so little fruit that no record of the yield 

 was kept. Two trees treated with Paris green produced 464 apples, 53 

 of which, or 11.3 per cent, were wormy. 



One tree treated with London purple at the rate of I pound to 300 

 gallous of water produced 985 apples, 58 of which, or 5.S per cent, were 

 wormy. Two trees treated with Paris green in tlie same proportion 

 produced 1,646 apples, 70 of which, or 5.2 per cent, were wormy ; a dif- 

 ference of six-tenths of 1 per cent in favor of the Paris green. 



Two trees treated with London purple at the rate of 1 pound to 400 

 gallons of water produced 847 apples, 40 of which, or 5.3 per cent, were 

 wormy, and one tree treated with Paris green at tbesame rate produced 

 ^85 apples, 58 of which, or 5.9 per cent, were wormy ; a difference of six- 

 tenths of 1 per cent in favor of London purple. 



Comparing the several treatments of London purple and Paris green 

 we find that 5.5 per cent of the yield of the three trees treated with 

 London purple were wormy, and 7.4 per cent of the yield of the five 

 trees treated with Paris green were wormy ; a difference of 1.9 per cent 

 in favor of London purple. 



