372 
Journal of Agricultural Research 
Vol. XXI, No. 5 
SUMMARY AND CONCLUSIONS 
As a rule American-grown celery seed is freer from Septoria spores than 
French-grown seed. 
Spores and mycelium taken from the surface of celery seed or from 
the pycnidia in celery leaves and kept in the laboratory lose their vitality 
in 8 to 11 months. 
Conidia and mycelium from pycnidia in the peduncles and pericarp of 
celery seed gave from 2 to 3 per cent germination at the end of 2 years 
but were dead at the end of 3 years. 
The vitality of the conidia and the mycelium which germinate at the 
end of 1 and 2 years is very low. 
Celery seed 3 or 4 years old gave a good germination test. The per¬ 
centage of germination of seed more than 4 years old is too low to warrant 
the use of such seed by commercial growers. 
The conidia are killed when heated for 30 minutes in water at 40 0 C.; 
the mycelium is killed at 45 °; celery seed when similarly heated is not 
appreciably injured below 50°. The vitality of celery seed is destroyed 
between 50° and 55°. 
The vitality of spores and mycelium in the pericarp of celery seed is 
destroyed at 48° and 49 0 C. without seriously injuring the germinating 
power of the seed; higher temperatures greatly impair the power of the 
seed to germinate. 
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