93 



by the codling- moth in 1902 was (jiiite \ai'ial)le, as there had been but 

 a soatterino- fruit crop the year before, and consequent!}' a lack of 

 insects in some localities. 



The orchard of the Wilson Fruit Company, which is a type of the 

 very ))est commercial orchards in Idaho, was planted in 1804 by Hon. 

 Edgar Wilson, and was sold by him to the company which is the pres- 

 ent own(»r in the early spring of 1002. Mr. Wilson acted as manag-er 

 for the orchard compan}" for the season, aided b}- Mr. W. F. Cash. 

 This orchard consists of 650 Ben Davis trees, 500 Jonathan, 750 Rome 

 Beauty, 141 Northern Sp3% and 800 treses which were planted as Wolf 

 River, but were subsequently budded to Jonathan, and have not yet 

 come to liearing. There are three short rows of Pewaukee, and a few 

 trees of other varieties scattered throughout the on-hard. 



The house in which the apples were packed and the culls stored in 

 the fall of 1001 is about 200 feet from the orchard and has always 

 been a source of infection for it. (PI. IV, figs. 2 and 3.) Early in the 

 season of 1002 Mr. Wilson purchased a gasoline- power spray outfit and 

 prepared to give the orchard a thorough spraying. The impro\'ements 

 made by Mr. Wilson and Mr. Cash have rendered this machine one of 

 the most efficient for this purpose. A single spraying was accom- 

 plished in a])out four days, using lime arsenite with soda exclusively 

 as a spraying solution. About 2,000 very heavily loaded trees were 

 in bearing. The conditions of the previous season were such that 

 there was an abundant supply of insects present in 1902, except in the 

 Rome Beaut}^ section. The writer estimated in 1001 that from 40 to 

 60 per cent of the fruit in the Jonathan and Ben Davis sections was 

 infested, no late spraying having been made; and the small amount of 

 fruit in the Rome Beaut v section was all infested. 



No bands were used, except upon the trees left unsprayed and a 

 verj'- few near the apple house. The blossoms of the Jonathan and 

 Ben Davis were f idly open about May 10, and had dropped about May 

 20. The Rome Beautv blooms through a longer period of time, and 

 some blossoms were observed as late as June 1. Spraying should have 

 begun about Ma}" 19, but on account of continued rains it was delayed 

 until the 23d, at which time the orchard was given a thorough spray- 

 ing. After tAvo weeks the orchard was again sprayed, at about the 

 time the first larva? were beginning to enter the fruit. By the 1st of 

 July about all of the larva? of the lirst generation had entered the fruit. 

 Countings on the Ben Davis and the Jonathan section gave an average 

 of a little less than 1 per cent infested, while the Pewaukee trees, 

 which were unsprayed, had from 20 to 26 per cent infested. The 

 Jonathan tree nearest the apple house had about 5 per cent wormy, 

 but this percentage decreased rapidly in the surrounding trees. Other 

 orchards in the same condition showed from 10 to 50 per cent wormy; 

 while orchards in which no remedial measures had been applied, and 

 in which no insects were left over from the year before, showed a very 



