33 



trees sprayed with it, and there will be Jess danger of its being washed 

 off of the trees by the rains. Instead, therefore, of seeking to render it 



more soluble, the opposite course should be pursued, and, if possible, 

 the Paris green should be treated in such a manner as to render it 

 wholly insoluble in water. To accomplish this result it is only acces- 

 sary to mix a pound of freshly slaked lime with each pound of the 

 Paris green, add a gallon or two of water, and let stand over night. 

 Treated in this way, the portion of the Paris green that is soluble in 

 water, and that produces the injury to the trees sprayed with it, unites 

 with the lime to forma compound wholly insoluble in water; by this 

 simple and inexpensive treatment the Paris green is rendered harmless 

 to the tree, while at the same time its poisonous nature is not lessened 

 to any appreciable extent. This process was first used by Prof. C. P. 

 Gillette, now entomologist of the Colorado Experiment Station, and 

 hi§ observations have been confirmed by a number of other experi- 

 menters. 



The great benefits resulting from treating fruit trees with Paris green 

 for the destruction of the Codling Moth are well understood by the 

 majority of our growers of decidtious fruits, a few of whom have learned 

 this by bitter experience. At a recent meeting of the horticultural 

 commissioners of southern California, Mr. John Scott, the commissioner 

 ' for Los Angeles County, stated that early in the present season he in- 

 structed his inspector in a certain locality to serve a notice on all of 

 the fruit growers in his district to spray their pear and apple trees with 

 Paris green and water for the destruction of the Codling Moth. The 

 majority of the growers complied with the request, but one of them, for 

 some reason, asked to be allowed to defer the spraying "for a short time, 

 and his request was granted. The spraying, however, was deferred 

 longer than was originally intended, and it was now considered too late 

 in the season to obtain good results, so his trees were not sprayed. 

 Long before his pears were ripe this grower made a contract with the 

 manager of one of the canneries in this city whereby he was to deliver 

 his crop of pears to the cannery, for which he was to receive the sum of 

 $2,000. When, however, he delivered his first load of pears, so badly 

 were they infested with the larvae of the Codling Moth that the manager 

 of the cannery refused to accept them. The grower then ottered them 

 at three-quarters of the original price, but his offer was refused ; he next 

 ottered them for one-half of the price originally agreed upon, but the 

 manager informed him that he would not accept the pears even if they 

 were given to him free of all expense. By the outlay of a very small 

 sum of money necessary for spraying the trees all of this loss to the 

 grower might have been averted. 

 19866— No. 30- 3 



