12 CIRCULAR 8 2 8, U. S. DEPARTMENT OF AGRICULTURE 



Trees on an adjoining 10 acres were left unscraped and unhanded as 

 a check. Both plots received the same regular spray treatment. Each 

 plot contained two varieties, alternating 2 rows of Jonathan and 6 

 rows of Winesap. Each plot consisted of 33 rows of 16 trees, or ap- 

 proximately 528 trees. The trees were thoroughly scraped and the 

 bands applied on July 13-16. Since the scraping was not done until 

 July 1-13, long after all spring-brood moths had emerged and after 

 some of the first-brood larvae had already left the fruit, little imme- 

 diate value was anticipated for this test. 



Examination of the harvested fruit showed substantial results in 

 favor of the scraped and banded plot, as compared with the adjoining 

 unsprayed, unhanded plot. Obviously, this apparent difference could 

 have been in the original codling moth population. 



In 1936 the same test was again used in the Gilbert orchard. The 

 scraping was done before moth emergence and the bands were applied 

 by the middle of June, before larvae began leaving the fruit. The 

 crop in both plots was much cleaner than in 1935, probably owing to 

 a much more intensive and better spray program. 



In 1937 the test in the Gilbert orchard was the same as in 1935 and 

 1936, except that one of each double row of Jonathan in the treated 

 piot and two rows only in the check plot had been removed by the 

 grower. In 1938 the test was the same as in 1937. In 1939 two more 

 rows of Jonathan had been removed in the check plot, leaving one row 

 of this variety to each six rows of Winesap, the same as in the treated 

 plot. This year the third cover spray was omitted in the treated plot 

 but not in the check plot. In 1910 the treated plot received two sprays 

 ]ess (the third and fifth cover sprays) than the check plot and the re- 

 mainder of the orchard. 



Work in the Zier orchard was started in 1936. The scraped and 

 banded plot and the check plot each consisted of approximately 400 

 trees or about 10 acres. There were six varieties in each plot — Wine- 

 sap, Jonathan, Delicious, Arkansas Black, Rome Beauty, and 

 Spitzenberg. In the treated plot all the trees were scraped and 

 banded, but only the first four varieties were examined at harvest- 

 time. The test in 1937 was the same as in 1936, except that some 

 Spitzenberg trees had been removed. In 1938 both plots were reduced 

 in size by removing a number of trees. The treated plot in 1938 in- 

 cluded 278 trees, and the check plot 330. 



In 1938 an experiment was begun in the Bounds orchard, adjoining 

 the Zier tract. The scraped and banded plot consisted of 453 trees 

 and the check plot of 501 trees. Counts were made on Winesap, 

 Jonathan, Delicious, and Arkansas Black. Similar tests were made 

 in 1939. 



In 1939 a test was begun in the Buchanan orchard, in a different part 

 of the district, using 368 scraped and banded trees and 332 check trees. 

 An unsprayed orchard was across the road from the scraped and 

 banded plot. In 1940 the treated plot was enlarged by 4 rows and the 

 check was reduced 4 rows. The adjoining neglected orchard of the 

 previous season was well cared for and Avas cleaner than the experi- 

 mental tracts. 



