87 



The showing was very nearly the same for the curculios as for 

 the codling moth,— 39 per cent, of the apples injured where the tree 

 had been sprayed with London purple, and 48 per cent, where it 

 had not been so treated. 



For the remaining particulars of this experiment, I refer the 

 reader to the tables appended to this paper, adding only the fact 

 that the entire number of apples handled from these two London 

 purple trees was 3,241. Late in the season some scorching of the 

 leaves similar to that attributed to the Paris green was noticed on 

 this London purple tree ; less serious, however, than in the other 

 easfi. 



LIME. 



Lime has been commonly used as an insecticide, in the form of 

 a powder to be dusted on the plant, but as this mode of distribu- 

 tion is very inconvenient in the orchard, we applied it in the same 

 way as the arsenical poisons, stirring it up in water and throwing 

 it upon the tree with a pump. 



No exact measurement was made of the ratio of lime to water, 

 but as large a quantity was used as could be conveniently managed, 

 no degree of injury to the foliage being anticipated. 



■ Fresh air-slaked lime was mixed with water and thrown imme- 

 diately upon the tree. A quantity was used sufficient to whiten the 

 leaves slightly as the water dried away. The same number of ap- 

 plications was made as in the other experiments, commencing June 

 13, except that the apples on one of the trees ripened before the date of 

 the last spraying, and consequently this tree received but seven appli- 

 cations. The lirst two trees selected, the experimental tree and its 

 check, were of the same variety and in all respects similar. The 

 first spraying was extraordinarily profuse on account of the frequent 

 stoppage of the cyclone nozzle with the particles of lime, several 

 buckets of lime water being used to each tree. 



On the 7th July a cursory search was made for the codling moth, 

 and one example was found upon each of the two trees sprayed. 

 The lime of the last spraying, done a week before, was still visible 

 on the leaves, notwithstanding several intervening showers. From 

 the examination of the falUm apples collected under this tree and 

 its check, there was no evidence of any effect upon the codling 

 moth, 53 per cent, of the 1,615 apples from the experimental tree 

 having been burrowed by the worms, as compared with 46 per cent, 

 of the 1,609 apples from the check. The same inefficiency of the 

 lime was indicated by an examination of the apples upon the trees, 

 200 apples upon the treated tree containing, July 21, 18 larvae of 

 the codling moth, and 200 from the check containing 16 such larvae. 

 The picked apples gave only a slightly different result ; 70 per cent, 

 of those treated with lime contained the codling moth and 78 per 

 cent, of those not so treated. The final ratios for the year, includ- 

 ing both fallen and ripened apples, were 54 per cent, of wormy 

 apples for the tree sprayed with lime water and 50 per cent, for 



