'80 
SEVENTH ANNUAL MEETING OF THE 
2J pounds of soda. I also use the Starr Ball Potash, or the 
Sterling Ball Potash, from which I get equally as good re¬ 
sults. It takes a little longer to boil it. I always put it in 
the tank hot. I use a 150-gallon tank. It is the most effect¬ 
ive remedy we ever had for scale. I tried it on the ladj^-bug, 
immersing the bug in the solution, and it would afterward fly 
away. I tried it on the grasshopper, also, but they were not 
injured by it. The effect on the Round scale is that it turns 
black and drops off in a few days. It is better than kerosene 
emulsion. It covers the tree over, but the rain finally washes 
it off. It takes me quite a liule time, however, to prepare 
this wash. 
Prof. Webber —What did you dilute it with; warm water? 
Mr. Duncan —> es, sir. 
Prof. Webber —Afier you have the material mixed up, 
what is the proportion of dilution that you use? 
Mr. Duncan —The same as yours. I use a little less of the 
rosin. 
Prof. Webber —Do you merely dilute one part to one part, 
as in the formula generally given? 
Mr. Duncan —I put in about five gallons of the preparation 
to make fifty gallons of spray. 
Prof. Webber —One of the points I make in regard to my 
method of preparing the wash is that in using 98 per cent, 
caustic soda one can prepare it with so short a boiling and 
then dilute it more times than in the usual formula, that is, 
one part to nine. 
Mr. Duncan —There is one thing y3u all ought to know. 
It would not be well to apply the spray when the fruit is 
young, as it will neutralize tne acid. I once had an experi¬ 
ence of this kind. I followed the advice of a California 
writer. The acid of the fruit was completely neutralized. 
We did not know until the fruit was matured what was the 
matter, or what caused it. We found out that it was this 
spray. Do not put the spray on at this time of the year, and 
not until the fruit is of considerable size. About June is the 
proper time, I think. 
Prof. Webber —In spraying for the White fly } 7 ou would 
necessarily make the first applications before the fruit comes 
on. You should make your first applications probably in 
January or February. The second period of spraying comes 
from about the middle of May to the middle of June. This 
spraying could be delayed until the fruit had become quite 
large. In treating other scale insects you can change the 
time. I was not, however, aware that any injury of this sort 
was produced by the rosin washes. 
