368 Agricultural Experiment Station, Ithaca, N. Y. 



those that are free from it is iio<t the same with, all varieties, nor 

 with any given variety in different localities. That the differ- 

 ence may often be considerable is shown by some compariijons 

 tliat were made scabby Newtown. Pippins and those that were free 

 from the disease. One bushel of that variety that was five from 

 scab was found to contain 202 apples, while the same quantity of 

 scabby apples contained 317 apples. The average weight per 

 apple was four and two and one-half ounces respectively. This 

 comparison >A'as between extremes, but those of the second class 

 were, in size, far below those that were free from scab. It is no 

 doubt true that scab may cause a diminution in size of fifty per 

 cent, but in most cases the loss is below that figure. In all cases 

 scab hinders development, but not always in proportion to the 

 amount found upon the fniit. Wherever scab is present at all, 

 either upon fruit or leavas^ the effect must be considerable in 

 arresting the develoxuuent of the fruit." 



The effect of the applications upon the larvae of the codlin-moth 

 was Aery marked. When the Paris green was applietl alone it 

 reduced the injury from twenty-five i)er cent to two per cent in 

 the cose of the King apples. The Baldwins vshow a marked ditfer- 

 ence also, the reduction being from thirty-eight per cent of woi-my 

 apples to only four per cent. When, applied with the Bordeaux 

 mixtur<- upon the King apples, the per cent of wormy fruit was 

 even less than when the Paris green was applied alone; but the 

 roA erse is true in the Baldwins. The experinnnit indicates that the 

 beneficifd action of Paris green as an insecticide is not materially 

 affected by the Bordeaux mixture when the two ai'e ai)pried 

 together. 



The results obtained when London puri)le or Paris green was 

 added to the Bordeaux mixture indicate the comparative value of 

 such combinations. In the King the number of wonny apples 

 was reduced to one per cent by the Paris green and to three per 

 cent by the London purple. The Baldwins show a reduction to 

 nine per cent by the Paris green and to only fifteen x>er cent by 

 the London purple. In each case the result is in favor of Paris 

 green. 



