Dec. 8,1923 
Budrot of Peach Caused by Fusarium 
509 
Conidia from 30 days’ old potato plug: 
3 septate 34-42 x 4-5, average 38 x 4.5. 
4 septate, 38-55 x 4.5-5, average 48 x 4.5. 
5 septate, 46-59 x 4.5, average 53 x 4.5. 
Conidia: 
From 45 days* old 4 per cent potato agar plus per cent dextrose: 
All were 3 septate, measuring 29-41 x 4-5, average 35 x 4.5. 
From 45 days’ old beef agar (plus 10) plus % per cent dextrose— 
1 septate, 17-27 x 4-5, average 23 x 4.5. 
3 septate, 25-32 x 4-5, average 29 x 4.5. 
Conidia from peach bud: 
3 septate, 38-46 x 5-5.5, average 42 x 5. 
5 septate, 46-59 x 5-6, average 55 x 5.5. 
As pointed out by Sherbakoff 3 there is little profit in growing species 
of Fusarium on a wide variety of media. Characteristic growth on some 
of the more commonly used media was as follows: 
On corn-meal agar: Hyphal growth colorless and scant, almost invis¬ 
ible except for white down near the upper margin of the slant. In seven 
days the slant was covered with colorless to pale salmon conidial masses 
of indefinite shape and size, often becoming a slime or pseudopionnotes. 
On corn meal: Growth rapid, the white abundant hyphae covering the 
•entire surface of medium (50 cc. in an Erlenmeyer flask of 100 cc. capacity) 
in 3 days and producing sporodochia more or less scattered over medium. 
Spore masses bright salmon. Drops of water 2 mm. or less in diameter 
appeared over surface. After 10 days, the spore masses were indeter¬ 
minate masses of slime covering most of the surface. The mycelial mass 
was still white but there were present numerous dirty white to yellow 
‘“concretions” or sclerotia. In 20 days the surface was wrinkled and 
yellow. Aerial hyphae were white but the surface was nearly covered by 
aggregations of bead-like bright salmon-colored conidial masses. 
On potato plugs: Aerial hyphae white and cottony; surface of plug, 
dirty white; sclerotia numerous, cream-colored, 1-5 mm. in diameter. 
Conidial masses salmon-colored, 4-5 mm. in diameter and composed of 
from 3 to several hundred smaller bead-like spore-masses averaging 5 mm. 
in diameter, a few being 1 mm. but many less than .5 mm. in diameter. 
On 4 per cent potato agar plus % per cent dextrose: In one week the 
snowy white cottony aerial hyphae covered the tube-slant. At center, 
pale salmon-colored sporodochia ranging in diameter up to 1 mm. were 
aggregated to form a clump 7 mm. across. 
On oatmeal paste: Sclerotia appeared in 10 days at margins of the 
media. Conidial masses were salmon-colored and indefinite (pseudo¬ 
pionnotes). Hyphae were cottony when young, dirty white when older. 
On oatmeal agar: As on potato agar, but with scant production of 
conidia. 
On steamed rice: White, cottony aerial hyphae, those at the surface 
of medium, yellowish white. Conidial masses salmon-colored, usually 
formless and slimy (pseudopionnotes), but occasionally there were deep- 
salmon sporodochia, which after 18 days’ growth in mass had a delicate 
reddish color. No characteristic odor was present. 
On 3 per cent prune agar: About the same as on commeal agar. 
Conidial masses slimy but not so diffuse as on cornmeal agar. 
On 3 per cent apple agar: White scanty aerial hyphae in loose wefts. 
Media turned from light brown to black in 4 days. No fruiting bodies. 
1 Sherbakoff, C. D, fusaria of potatoes. N. Y. Cornell Agr, Exp. Sta. Mem. 6, p. 87-270, 51 fig., 
7 col. pi. 1915. literature cited, p. 269-270. 
