INJURIOUS INSECTS OF I909 AND IQ1O. 101 
per acre, has proven very beneficial. It should be applied a few 
weeks before planting and should be very thoroughly worked into 
the soil. 
Downy Mitpew: The downy mildew occurs usually in the 
seed bed—seldom in the field. It produces grayish white patches on 
the under surfaces of the leaves. Opposite the spots, on the upper 
surface of the leaves, there are yellowish, somewhat shrunken spots. 
Spraying with bordeaux will control the disease. 
Celery. 
Lear Spot—Ear.ty Bricut: Yellowish, angular spots, with 
somewhat raised borders, appear on both sides of first the outer and 
then the inner leaves. As the disease progresses, the centers of the 
spots become grayish in color; the leaves wilt and dry. Mugg 
weather is favorable to the spread of the disease. 
In order to control it, spraying should be begun early—in the 
seed bed—and continued at intervals of ten days or two weeks. 
Either 5-5-50 bordeaux or ammoniacal copper carbonate may be 
used. 
Late Buicut: Leaf spots, similar in the early stages to those 
of the early blight, appear on the leaves. Later numerous small, 
black dots appear on the affected portions. The leaves may rot 
away entirely, either in the field or in storage. The trouble in 
storage is greatly increased if the celery is kept in moist, poorly 
ventilated places. 
Control measures may be taken as indicated under early blight. 
It is especially important to begin spraying as soon as the plants 
come up. If the plants are at all affected, the leaves should be 
dipped in ammoniacal copper carbonate before being stored. 
Cucumber. 
CucumBEerR BeEETLE: In the adult condition these striped 
beetles eat the leaves and so can easily be combated with the arsen- 
ical insecticides. In the larval form they sometimes do great injury 
to the roots of cucumbers. We have had good success against this 
form by using tobacco dust on the exposed roots of the plants. 
Downy MitpeEw: The downy mildew produces yellowish 
spots, irregular in outline, first upon the older and then upon the 
younger leaves. In warm weather the spots may spread rapidly, 
eventually covering the entire leaf, which then dries and may fall. 
