New York Agricunturat Exprertment Station. 395 
A second application was made September 17. At this time 
Paris green was added to the Bordeaux mixture used on Plat 2. 
No attempt was made to respray the lower outside leaves as they 
were still protected by the material applied the first time. Exam- 
ination of the work on September 21 showed that on Plats 1 and 
8 all the cabbage worms, as well as the loopers, had disappeared. 
Many dead specimens of each were found. Many of the cabbage 
worms had disappeared from Plat 2, but no dead specimens were 
found here. They had apparently crawled away to pupate. 
Plenty of living loopers were found on Plat 2. 
After two heavy rains the plats were re-examined September 
29. Very little, if any, difference could be seen in the amount of 
material still adhering to the plants of Plat 2, as compared with 
Plats 1 and 3; but a marked difference could be seen in the plants 
themselves.” The leaves of the plants on Plats 1 and 8 were 
nearly perfect, while those on Plat 2 were completely riddled, as 
were also those of the checks. | 
Paris green and flour.— On September ‘1st the owner treated 
4 1-2 acres of the field with a mixture of dry Paris green and flour. 
When examined, September 4, no dead cabbage loopers could be 
found, but the cae had disposed of a large number of the 
cabbage worms.’ | 
A final comparison of the tests was made October 19. On 
Plats 1 and 8 the cabbage had formed marketable heads, while 
that of Plat 2 had made no better growth than the checks; in 
10 This indicates one of two conditions; either there must be enough of the 
resin lime mixture adhering to the under surface of leaves to kill the worms, 
or there is an invisible film of the mixture on the upper surface holding Paris 
green enough to do the required work. 
11 The cabbage looper is an active caterpillar and at the same time sensitive 
about what it eats. If any foreign substance occurs on a leaf and the looper 
can possibly find leaves that /.re clean it will not touch those that are cov- 
ered with foreign substance. “This habit probably accounts for the fact, that 
the looper was not killed by the treatment with Paris green and flour. Such 
a mixture only adheres to the upper surface and in the folds of the leaves at 
best, hence the looper is able to find food without feeding upon the treated 
areas. 
