105 
that it lias been reported to us from Arkansas, Louisiana, Indian Terri¬ 
tory, and Mississippi. 
From the nature of the disease there is every reason to fear that it 
will be very difficult to prevent by fungicides. Anthracuose of the 
grape is more obstinate than black-rot, and no well defined, certain 
remedy is yet known for it. The treatment of anthracuose of beans 
and melons has been attempted on a small scale and has failed com¬ 
pletely. The hollyhock disease has been only partially prevented by 
the use of fungicides that would have succeeded perfectly with black- 
rot of grapes or leaf-blight of pear. In some of these cases, however, 
a partial success has been attained and the indications are that the 
proper use of Bordeaux mixture may finally conquer even this type of 
fungus. 
The vitality of the fungus as shown by its reviving after drying, and 
the power of the spores to reproduce themselves, are very sure indica¬ 
tions of one mode of preventive treatment, viz, the removal from the 
field of all diseased bolls as soon as possible. A worthless boll will be 
likely to produce fresh spores with every rain, and if left over winter 
in the field will probably prove a source of infection the following sea¬ 
son, for each spore is capable of infecting a fresh boil. One infection 
experiment was made on three healthy bolls. The spores weie inserted 
in a cut and the fungus was produced in great quantities all around 
the cut. The value of this experimment was lessened by the fact that 
the fungus also appeared on one of the check bolls and that all were 
taken from a field in which the disease was present. The fact, however, 
that on the infected bolls the fungus was confined to the vicinity of the 
cuts is evidence that it was caused by the inserted spores. 
Plans are being made to test the value of fungicides in checking this 
disease during the next cotton-growing season. 
EXPLANATION OF PLATE. 
Colletotrichium <joss\jpii, n. s. 
Fig. 1. Section through old fruiting layer, showing the set* borne ou dark-colored 
cells, above the level of the basidia; a a, enlargements of set* near the end. 
X 360. 
Fig. 2. Section through younger portion of fruiting layer. Two set* bearing spores. 
X 600. 
Fiff. 3. Section showing stroma mixed with tissues of the boll. X 800. 
Fig. 4. Spores; a a, borne on basidia. X 600. 
Fig. 5. Filiament of mycelium passing through cell wall. X 800. 
Fig. 6. Portion of artificial mycelium bearing set* at a and c, and at b basidium with 
immature spore. X 600. 
Fig. 7. Different stages in the formation of spores in artificial culture. X 600. 
14007—No. 3-2 
