S. Department of Agriculture,
p. 25.]
TREATMENT WITH CALCIUM CYANAMID AND ACID PHOSPHATE.
Many experiments with mixtures of commercial fertilizers were tried to
determine whether fly larvae would be killed by any substance the
addition of which would increase the fertilizing value of the manure. A
mixture of calcium cyanamid and acid phosphate was found to possess
considerable larvicidal action. Several experiments showed that 1/2
pound of calcium cyanamid plus 1/2 pound of acid phosphate to each
bushel of manure give an apparent larvicidal action of 98 per cent. The
mixture in the form of a powder was scattered evenly over the surface
and then wet down with water. The use of this mixture adds to the manure
two important elements, nitrogen and phosphorus.
MAGGOT TRAP FOR DESTRUCTION OF FLY LARVAE FROM HORSE MANURE.
The second method of handling manure is one which does not require the
application of chemicals. It is based on the fact, mentioned on page 4,
that the larvae of the house fly, a few hours before they are ready to
pupate, show a strong tendency to migrate. This migration takes place
mostly at night, and the larvae sometimes crawl considerable distances
from the manure pile. Now it is possible by means of a very simple
arrangement called a maggot trap to destroy fully 99 per cent of all
maggots breeding in a given lot of manure. A successful maggot trap
which the Maryland Agricultural College constructed at the college barn
is shown in Figure 9.
Pages:
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35