418 



THE MONTHLY BULLETIN. 



COUNTY COMMISSIONERS' DEPARTMENT. 



CODLING MOTH SPRAYING IN YUCAIPA, 1916. 



By J. B. Hundley. 



Orchard 

 number 



Date of 



blossom 



spray 



Date of 

 second 

 spray 



Kind 

 lead arsenate 



I Pressure 

 Paste 1 from 

 or dry | power 

 sprayer 



200 lbs. 

 250 lbs. 

 200 lbs. 

 250 lbs. 

 200 lbs. 

 200 lbs. 

 175 lbs. 

 20O lbs. 

 225 lbs. 

 200 lbs. 

 175 lbs. 

 200 lbs. 

 275 lbs. 



April 4 

 April 19 

 April 4 

 April 3 



and 24 



and 23 

 and 18 



._-! April 8 and 26 



7 i April 28 



8 I April 9 and 24 



*9 I April 31 



10 ! 



11 — 



12 ... 



13 ... 



Mar. 25 

 Mar. 28 

 April 20 



May 12 

 May 15 

 May 12 

 June 24 

 May 11 



May 7 



May 18 



May 11 



May 22 



July 11 



July 18 



July 11 



July 22 



July 17 



Sept. 

 Sept. 



July 17 



July 11 



July 17 



July 21 



July 15 

 July 23 



4 

 2 

 1 

 25 

 15 

 60 

 15 

 20 



.1 



25 

 45 

 40 

 50 



Swift & Corona. Both 



Corona Dry 



Swift & Corona.; Both 



Corona Dry 



Corona j Dry 



Swift 1 Paste 



Corona j Dry 



Corona j Dry 



Corona \ Dry 



Corona Dry 



Corona [ Dry 



Corona ' Dry 



Swift Paste 



*Sprayed under supervision of J. B. Hundley. 

 Nos. 11 and 12 pear trees. 



Note. — It is not generally known in northern California that in 1916 there were 

 over 1,200 acres of apples in bearing in the Yucaipa and Victorville sections of San 

 Bernardino County and over 6,000 acres which had not yet come into bearing. A 

 large part of this 6,000 acres reported as nonbearing will be bearing in 1917. Owing 

 to the fact that a few older orchards in the Yucaipa section have been trovibled with 

 codling moth for years the newer orchards as they came into bearing had consider- 

 able of their fruit injured by this pest. Realizing that careful spraying would be 

 necessary for the proper control, Mr. J. B. Hundley, County Horticultural Inspector 

 for San Bernardino County, at Yucaipa, not only urged the growers to adopt the best 

 known methods of spraying but undertook the personal supervision of the work in 

 as many orchards as it was possible for him to give the proper attention with the 

 limited time at his disposal. The results of the efforts of Mr. Hundley were exceed- 

 ingly gratifying, as a study of the foregoing table will plainly show. The orchards In 

 which spraying was done under his supervision, at the right time, and in the most 

 careful manner, had respectively 4 per cent, 2 per cent, 1 per cent and .1 per cent of 

 wormy apples, while orchards not sprayed according to his directions, but in which 

 he made careful observations had respectively 25 per cent, 15 per cent, 60 per cent, 

 15 per cent, 20 per cent, 25 per cent, 45 per cent, 40 per cent and 50 per cent of their 

 fruit wormy. 



In the case of the orchard in which only .1 per cent of the apples were wormy, the 

 fruit was of an early variety and was picked on August 25th. Mr. Hundley accounts 

 for the exceedingly low percentage of worms in this case by the fact that picking was 

 done early and as a consequence the fruit escaped late worms which in orchards of 

 later varieties entered commonly in September and which were thought to be larvae of 

 a third brood which ravaged the crop late in the season. 



The results of Mr. Hundley's work are very interesting and add additional testimony 

 to the fact that codling moth is not easily controlled and that it is only through the 

 most careful spraying at the most opportune time that the best results can be attained 

 during seasons when the pest is abundant. — G. P. W. 



