3*6 
C. Experiment Station 
were reduced in number from 6 to 4 or 3, the seeds should not so readily 
bulk between them and the stirring should very probably be satisfactory 
when the drum is considerably more than half full. 
During the course of a treatment, considerable quantities of fuzz wear 
off the seeds and fall onto the heater shield; this should be cleaned off 
once or twice during the treatment. In one test in which 3600 grams of 
seed were treated, 22 grams of fuzz was collected during the treatment. 
Certain workers in Egypt, namely, Story 29 , 30 and Gough 21 have published 
descriptions of machines designed to treat cotton seed with dry heat as 
a means of combatting the pink boll worm. Since the larvae of this insect 
are killed within a few minutes by heating infested seeds at temperatures 
of 60 or 65° continuous operation is possible. By means of belt or screw r 
conveyors, the seeds in contact with hot steam conduits or hot air currents 
are carried slowly through the heating chamber, traversing the machine 
and reaching the exit in the course of about 10 minutes. These machines were 
unknown to the writer until more than two and one-half years after he had 
first used the one designed by himself for the control of anthracnose, and 
they are very different from it. Because of the higher temperature and much 
longer period of treatment required for control of anthracnose than for 
pink boll worm, it appears that the machines described by Story and Gough 
are not well adapted to the treatment required to destroy seed-borne 
elements of the cotton anthracnose fungus. 
FIELD, GREENHOUSE AND GERMINATOR TESTS OF SEED TREATED IN BULK 
While this investigation has been in progress, seed which had been 
treated in bulk have been planted in the field, in flats in the greenhouse 
and in test tubes in order to determine the effectiveness of the treatment 
in the control of anthracnose. 
In 1921, diseased seed which had grown in the season of 1920 and which 
had been treated in an improvised gas oven as described on page were 
planted in small plots in fields on the farm of the Negro State Hospital 
at Goldsboro, N. C., and on the Coastal Plain Branch Station Farm at 
Willard, N. C. When these plots were visited on August 16, the cotton 
was in excellent condition, forming a good crop of bolls, but no anthrac¬ 
nose was found at either place. A second and final examination of these 
plots was made on September 24, 1921. No anthracnose was found on 
either treated or untreated plots on the farm at the Negro State Hospital. 
The complete absence of anthracnose from the untreated seed plot may 
be attributed to the dry weather which prevailed at this place during most 
of the fruiting season for cotton. At the Willard farm, where more humid 
conditions had prevailed, 8.6 per cent of the plants on the treated plot 
and 41.5 per cent of the plants on the untreated seed plot bore one or more 
bolls infected by the anthracnose fungus. These two plots which were on 
the same kind of land and had received the same cultural treatment were 
separated by 10 rows of corn. The results of this test indicate that the 
treatment given the seed had greatly reduced but had not completely 
eliminated the disease from the seed. 
