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ing the critical inspection of more than 

 100,000 apples, representing upwards of 

 600 bushel boxes. .A full report of that 

 work has never been published, but a 

 brief summary was issued by me in Bul- 

 letin 119 of the Colorado Agricultural 

 Experiment Station in February, 1907, 

 from which I quote my conclusions as 

 to the number of sprays necessary: "The 

 number of sprays required to control the 

 moth in an orchard will depend princi- 

 pally upon (1) previous infestation of 

 orchard, (2) proximity to other infested 

 orchards, (3) efficiency of earlier sprays 

 and (4) variety of fruit." Althiiugh in 

 the G. W. Marchant orchard at Fruita 

 that year 98% Winesap and 95.6% Ben 

 Davis were secured with only two sprays, 

 it was stated in the bulletin quoted, that 

 in common practice there would be more 

 than this number of sprays necessary, 

 and consequently a table was given for 

 the use of fruit growers suggesting 

 approximate times for five sprayings 

 each year, if that many became neces- 

 sary. In the summer of 1907, while still 

 connected with the office of the West- 

 ern Slope Fruit Investigations for the 

 State Agricultural College, I carried on 

 another season's codling moth spraying 

 experiments in Hill Bros", orchard on 

 Orchard Mesa, at that time securing 

 96.5% perfect fruit with two sprays 

 against the first brood and one against 

 the second, and 97.3% with all three 

 sprays against the first brood. 



After several additional years' experi- 

 ence in codling moth spraying, and espe- 

 cially after the past year's observations 



in this valley, I am more than ever con- 

 vinced that my conclusions as published 

 five years ago were correct, and that it 

 is folly for anyone to state arbitrarily 

 the exact number of sprays necessary 

 under all conditions to control codling 

 moth. Statements to the effect that one 

 or two sprays will control codling moth 

 in any section under all conditions to 

 me denote that they are based upon 

 observations too limted or upon experi- 

 ments with insufficient range of condi- 

 tions. The sweeping claims that have 

 been made as to the possibilities of the 

 one-spray method for codling moth con- 

 trol have been misleading in that they 

 were not properly qualified as to con- 

 ditions. Bulletin No. 127, which was 

 recently received from the West Vir- 

 ginia Experiment Station, states that the 

 Western one-spary method gave 97.4% 

 apples free from worm injury, but it is 

 of interest to note that only 34% of the 

 apples became wormy throughout the 

 season in unsprayed orchards. A recent 

 bulletin from the United States Depart- 

 ment of Agriculture gives some results 

 in controlling codling moth by a single 

 spraying, the experiments being under- 

 taken as a result of the claims for the 

 one-spray method. These recent govern- 

 ment experiments were conducted in 

 Arkansas, Virginia and Michigan, and 

 although from 84% to 93.6% perfect fruit 

 were secured, it is interesting to note 

 that worms were not particularly abun- 

 dant, as shown by the statement that the 

 percentage of perfect fruit for the whole 

 season in orhcards where no spraying at 



