873 
stand ten minutes. It was then drawn off for the last time and a new 
lot of grain put in and treated as in the first ease. 
Mr. Bartholomew says that seed treated in this way yielded less than 
one-tenth of 1 per cent of smutted oats, while in fields where no treat¬ 
ments were made 20 per cent of the grain is often affected with the 
fungus. A piece of 6-incli stovepipe, it is thought, will answer the 
same purpose as the bucket. The pipe should be arranged so that it 
will stand at least 4 inches above the bottom of the barrel. 
FIELD NOTES, 1892. 
By Erwin F. Smith. 
[Plate XXXVIII.] 
A NEW MELON DISEASE. 
A widespread disease of muskmelon leaves was observed in south¬ 
western Michigan in September. The foliage was destroyed almost com¬ 
pletely over whole fields and the fruits failed to ripen. The symptoms 
suggested the work of a Peronospora, but an Alternuria or Macrosporium, 
supposed at first to be a saprophyte, was the only fungus found. Owing 
to the economic importance of this disease it will be made the subject 
of a special paper, the fungus having since been studied in the labora¬ 
tory and the disease reproduced in the field by pure cultures made 
from single spores. 
GRAPE POWDERY MILDEW.* 
The powdery mildew of the grape Avas abundant on many varieties 
in an experimental vineyard at South Haven, Mich. The perithecia 
were Avell developed and numerous on September 19, although there 
had been no cold weather or frosts. This is opposed to Vi ala’s hypoth¬ 
esis, that severe frosts are necessary for the formation of the peii- 
thecia.f 
APPLE SCAB.| 
Apple scab was exceedingly severe in western New York and central 
and southwestern Michigan. There was an almost total absence of 
* Uncinula spiralis B. & C. 
tLes pdritheces sont relativement rares en Amerique; ils ne se produisent jamais 
qu’a la fin de l’automue lorsque les grands froids brusques surviennent et cela seule- 
ment dans les regions dn Nord; ils sont surtout frequents dans la Nouvelle-Angle- 
teire. Dans Missouri, le Texas, la Californie, on ne les observe presque jamais; ils 
sont rares dans la Virginie. II semblerait done que les froids rigoureux arrivant 
brusquement soient necessaires a leur formation.— Une Mission f itieole en Amerique, 
p. 283. 
\Fusicladium dendriticum Fkl. 
