~ 6 = 
further reduced the infestation, there being only about 5 to 7 per cent 
of wormy apples where four to six oil sprays were used. The percentage 
of stung fruit is also interesting, being 22 per cent for no oil, 19 
per cent for two oil sprays, and 4 to 10 per cent for four to Six otf 
sprays. According to western grade rules, one or more healed stings 
on an apple put it in a lower grade with a value of about 25 cents a 
box less, and stings that are not healed cause an apple to be classed 
as a cull. Therefore, the difference in stings is important, as our 
classification of stings includes all that are less than 1/4 inch in 
depth, whether healed or not. These figures are the result of spray- 
ing the same trees in the same manner for two years." 
Mr. Newcomer also reports on a "block of 64 (apple) trees * * * 
that has been banded for two years with corrugated paper bands treated 
with beta-naphthol. The difference in infestation this year was re- 
markable. A ratio has been figured of the number of worms in 1931 to 
the number in 1930, both in the banded block and in three unbanded 
blocks which had identical spray treatments. * * * It is foundeeiiae 
in the banded block, for every worm last year, there were 1.22 worms 
this year, and in the blocks not banded, for every worm last year there 
were 2.55 worms this year. It should be remembered that this has been 
the worst codling moth year we have ever experienced. It was also 
found that 3 and 4 inch bands did not catch any more worms than 2 inch 
bands; that by picking time only about 19 per cent of the worms had 
left the Jonathan and 37 per cent had left the Winesap; and that of those 
that had left the apples about one-third were in the bands." 
E. H. Siegler, of the Takoma Park, Md., laboratory, who devised 
chemically treated codling moth bands, and is cooperating with the work— 
out of these bands through leaders of various laboratories of the Bureau 
concerned in investigation of the codling moth, submits a summary of 
data on the comparative value of bands of different widths as tested 
at six field laboratories. Mr. Siegler says: "these studies were made 
by using half and half bands in order to eliminate insect population 
heterogeneity in so far as possible. * * * in Experiment 1 ten trees 
were used. Each of these trees was provided with two so-called half 
bands, one of which was 4 inches in width and the other 3 inches. Each 
of these bands extended half way around the tree trunk. The results 
Show in this experiment that 538 insects were captured by the 4-inch 
width and 432 by the 3-inch width band." A total of 81 trees were band- 
ed and a total of 8,054 larvae were found in the 4-inch bands, whereas 
7,561 larvae were found in the 3-inch bands. However, at three labora- 
tories the 3-inch bands yielded fewer larvae (425) than the 2-inch 
bands (449). The Bureau specialists "Suggest to growers the use of a 
<-inch width in preference to one 4 inches wide, in spite of the fact 
that the wider bands have captured a somewhat larger number of insects. 
The additional number captured, however, by the wider band appears too 
small to justify its double cost, except in districts in which the in- 
sect population is so great that a two-inch width band has insufficient 
capacity." 
