SCRAPING AND BANDING FOR CODLING MOTH CONTROL 13 



In 1940 a test was set up in the Bannister orchard, consisting of 

 approximately 30 acres of 30-year-old trees, which was more isolated 

 than any /used before. On three sides there were no orchards for a 

 mile or more, and on the fourth side this orchard was separated from 

 the nearest neighboring one by a distance of more than 500 feet. The 

 scraping was not completed until May 9, when moths had been emerg- 

 ing for 2 or 3 weeks. One-half of the orchard was scraped at this 

 time and after July 1 the scraped area was increased to about two- 

 thirds (1,150 scraped trees and 420 unscraped trees). That part 

 scraped in May was banded early in June and the remainder in July. 

 No count trees were taken from the latter section, but it served as a 

 buffer block. 



The following varieties were scraped and banded: Winesap, De- 

 licious, Rome Beauty, and Arkansas Black, also some Jonathan trees 

 that were parti}- grafted to Delicious. Arkansas Black and Jonathan 

 were not used in harvest counts. 



In 1941 only the Bannister orchard was used. The trees were 

 scraped by April 20, before moths emerged, and the bands were ap- 

 plied on two-thirds of the scraped tract by June 26 and on the other 

 third by July 2, a few days late for catching the earliest worms. 



In 1942 a test, which was a part of another experiment, was begun 

 in the Briskey orchard with 200 Winesap trees in the treated plot and 

 TO trees in the check plot. 



Results of Tests 



The results of these 14 experiments, involving 47 tests of varieties 

 for the 8-year period 1935-42, are summarized in table 4. They show 

 that in general the scraped and banded plots had more clean fruit, 

 fewer wormy apples, and fewer stings than the unscraped, unhanded 

 plots. These gains from scraping and banding were made notwith- 

 standing a number of adverse conditions. It was necessary to have 

 an unscraped and unhanded check plot in each orchard, and from 

 this untreated plot infestation doubtless spread into the treated area, 

 somewhat reducing the potential control. In one orchard the treated 

 plot was joined on the north by a heavily infested, unsprayed orchard, 

 the effects of which were very noticeable, especially in the nearest sev- 

 eral rows. Large-scale community or orchard-district scraping and 

 banding would obviously give the best results. 



For all varieties (table 5) , analysis of variance shows all differences 

 except in the Rome Beauty variety, to be highly significant at odds of 

 99 to 1 in favor of the scraping and banding treatment. Although 

 the Eome Beauty plots showed from 1.6 to 4.2 times as many worms 

 per 100 apples in the untreated as in the treated plots, the 4 tests 

 showed too great a variance to be statistically significant. In the check 

 plots each variety averaged 2 to 2.3 times as many worms per 100 

 apples as were found in the treated plots. 



