32 
Usually when { ' trailer ' ' applications were made the sprayer was 
driven only in every other alley between the grape rows, each rod- 
man spraying both sides of his row on the same trip. 
During the season of 1915, in the Moorhead vineyard, Plats II and 
IV, the sprayer was driven in every alley, each rodman spraying only 
one side of a row on each trip. While it was easier to cover the foliage 
by this method, it was slower and it showed no distinct advantage 
over the usual method, in controlling the berry moth. It was given 
no further trial. Which of the two methods is best is probably a 
matter of individual preference. 
Careful work was an absolute necessity for successful "trailer" 
applications. While the responsibility rested chiefly with the rod- 
men, unless the driver was careful about gathering up the hose and at 
the same time allowing the rodmen time to finish spraying each 
vine the work was handicapped greatly. It was necessary also that 
the rodmen should make an effort to cover each cluster or the advan- 
tage of u trailers" over the strictly mechanical method was lost. 
Time and Number of Applications. 
The most satisfactory spray schedule was as follows: The first 
application to be made immediately after the falling of the bloom; 
and the second application about two weeks later, at the time when 
the berries are just touching. This proved effective both in 1915 
and in 1916, and was the schedule used in the majority of plats. 
A single application at the time the berries were just touching 
reduced the infestation greatly, but hardly offered satisfactory 
results. It was tried only in the season of 1916. This spray is 
intended for late first-brood larvse, and enough of the poison will 
remain on the berries, at the time of the hatching of eggs of the 
second brood, greatly to reduce this brood as well. The effect of 
this spray against the second brood is shown by referring to the 
counts in Bartlett (lower) vineyard, Plat I, in comparison with the 
adjacent Check Plat A. Plat I was naturally more heavily infested 
than was Check Plat A, as the first-brood count showed that it had 
about 50 per cent more infested berries than did "A." On the other 
hand the final count showed the percentage of infestation in Check 
Plat A to be three times as heavy as that in Plat I. Similar final 
results are shown in Southwick vineyard, Plat IV. The results in the 
Moorhead vineyard, Plat VI, would indicate that in case of light 
infestation this one application might control the berry moth satis- 
factorily. 
In 1916 a single application, made on August 12 and aimed directly 
against the second brood, also reduced the infestation considerably, 
as shown in Bartlett vineyard Plat II, although the counts did not 
appear as favorable as the single earlier application previously men- 
