

New York AGRICULTURAL EXPERIMENT STATION. 585 
It should be noted that the unsprayed plants used for these 
analyses were taken from the field a few weeks later than the 
sprayed plants, and also that they were of a larger variety. The 
presence of copper in the unsprayed soil furnishes sufficient explan- 
ation for the presence of the small amounts of copper found in 
the untreated celery. No explanation is offered for the fact. that 
in every instance where the celery was sprayed with potassium 
sulphide, analysis of the plants showed more than the average 
amount of copper in the plant. 
These investigations show that when this sprayed celery was 
stripped and ready for market the sprayed plants “were no 
more poisonous than the unsprayed. Were the copper present 
in the plant as sulphate it would be impossible for any man to 
eat enough of it to get even an astringent dose. We may there- 
fore conclude that Bordeaux mixture or ammoniacal solution of 
copper carbonate prepared according to the formulae advocated 
on previous pages may be sprayed on celery before banking the 
plants without any fear of poisonous results. 
Recapitulating the results of the investigations of celery leaf 
spot diseases as herein set forth it may be stated that: 
1, Copper mixtures may be used as herein recommended with 
no fear of poisonous results. 
2. Celery Septoria attacks the seed as well as the foliage. 
3. The season’s experiments indicate that Bordeaux mixture is 
to be preferred in treating celery for the Septoria. 
It is recommended: 
1. That diseased seed be rejected. 
2. That plants be thoroughly treated with Bonmans mixture 
in the seed bed. 
3. That the treatment with Bordeaux mixture be continued 
from transplanting time to blanching time if there is reason to 
- anticipate attacks of leaf spot. 
4. That the refuse of a diseased crop be not allowed to rot on 
the ground if celery is to be grown there the following year. 
74, 
