Shoshone journal. [volume] (Shoshone, Idaho) 1884-1931, 1897-09-17
Whatever is done to destroy the weed
should be done at once.
Chas. ID. Woods Director.
University OF Maine, July 2, 1897.
Diseases OF hot House Vegetable.


Bulletin 70 OF the Ohio Agricultural
Experiment Station is devoted to stud
ies of some of the more common plant
diseases OF the forcing house and gar
den, especially those encountered In
the culture OF vegetables under glass
an industry which is assuming very
considerable Importance in Ohio and
other northern states. The bulletin is
illustrated with several plates. Com
plants are frequently received at the
station OF lettuce rot disease which
Affects the head varieties especially,
when grown under glass. The Grand
Rapids variety seems to suffer least
Too high a temperature. especially at
night, Is conducive to the rot Thor
ough ventilation and care in watering
are the remedies suggested. Other dis
eases OF lettuce are leaf blight, leaf
perforation and downy mildew. Expe-
rience at the station and elsewhere has
demonstrated that when lettuce is
watered by sub-irrigation IT is much
less liable to these diseases than when
surface watered. Another class OF dis
eases, affecting more especially roses
tomatoes, begonlas. cucumbers and
some other plants Is caused by small
eel-worms or nematodes. microscopic
In size, which work in the roots OF the
plants. causing minute engagements
or gals The symptoms of attack are
stunted growth. following and drop
ping OF leaves, especially dying of the
leaves at the point of lateral margins.
with scalded aspect In roses, which !
are the most liable of all plants TO
nematode attack, the disease is often |
called the yellows." Thorough steam
Ing OF the soil before planting is the
most promising remedy yet discovered |
at the station.
The powdery mildew OF composite
plants has been successfully combated
upon cinerarias, when taken in time,
by spraying with weak solution of po-
asslum sulphid or copper sulphate.
Probably the downy mlldew of the Gu
lumber would yield to the same treat
nent The sudden willing of outdoor
is due to a bacterial disease,
which may be carried from plant to
liant by the cucumber beetle. No eff
eetudi prevention is known, DuL lne
BURNING OF diseased plants and the de-
truction Of the beetles are indicated.
spot upon the leaf and fruit of Gu
umbers is found in the east and is
kelly to cause trouble to pickle grow
rs In Ohio. Spraying with Bordeaux
fixture is indicated for this disease,
3 well as for new leaf-blight Of the
lusk-melon, causing many rather
.rge, dried spots in the leaves, follow
I by dying and curling under from the /
ps and margins. Tomato leaf-mold is {
lie most common fungus disease of to- {
atoes grown under glass. This caus- S
serious loss IN the station green 7
buses in 1891 where it was introduced /
an old plant carried over. from c
hich 1t spread throughout the houses.
he disease first appears as rusty
own patches on the under side of the h
ayes; as these patches enlarge the @
AZ becomes yellow, Wits and finally 7
es In cases Of severe attack the r.
hole plant may perish. and in any t
Sc It's growth will be seriously check Il
With leaf-mold. as with lettuce v
/, thorough ventilation is required, l.