i ee 
The various capacities and types of outfits used at first naturally resulted in lack 
of uniformity of spray application in the different plots, but since 1935 this dif- 
ficulty has not existed. 
Sulphur dusts were applied with a Niagara blower dust gun, This gun 
blows a good cloud of dust to a height of 8 to 10 feet. Almost without exception, 
the dust applications were made in early morning when dew was on the foliage and 
before the wind became too strong to prevent uniform dusting. 
Summer applications of fungicides have been started in May or early June 
each year, except in 1936 when the first summer spray was applied during the last 
week of April. In the early period of the works applications were made at approx-= 
imately three-week intervals, More recently, the first summer spray has been 
applied in early May and subsequent applications have been made every ten days to 
two weeks until the begiming of the dry weather period, which is usually about the 
middle of July. Three-week intervals between applications have been allowed after 
that time. Summer applications of fungicides were terminated the latter part of 
Auguste 
Dormant applications of liquid fungicides were started in the spring of 
1935 in 2 of the 3 new plots started that year. The practice of applying both 
spring and fall dormants has been followed, the fall dormant being applied in Octe 
ober or November and the spring dormant in March or early April before the buds 
opened. 
Observations were made on the effectiveness of each fungicide used and on 
each type of practice employed. Data were recorded at regular intervals during the 
growing season on the prevalence of the “elm wilt," The trees in the several plots 
were divided into separate blocks and each block in a given plot received a differ- 
ent treatment, One block of trees in each plot remained untreated, and these served 
as a check on the various treatments employed. 
~5e 
