146 REPORT OF THE HORTICULTURIST OF THE 
* 
It appears that in this trial the Paris green was most effectual, 
and the ‘“ Zoektein poison” next. The foliage of the trees treated 
with the latter blackened somewhat after the spraying, probably 
due to the dissolved arsenic. A similar effect was observed last 
season when the solution was applied at double the concentration. 
It would have to be diluted still more before it may be safely 
used. 
The wide variation in the percentage of infested fruits in the 
unsprayed parts of different trees suggests that the more common 
method of using check trees for comparison with treated trees 
may be quite unreliable. 
The trees used were considered the best ones available for the 
experiment. Unfortunately they did not yield a good crop of 
fruit. The numbers presented are too small to make the experi- 
‘ment conclusive, but the results have a value as furnishing addi- 
tional data upon this important subject. 
POTASSIUM SULPHIDE FOR INSECTS. 
For the Currant Worm. 
As noted in the article on “Experiments with Fungicides,” in 
this report, potassium sulphide when used as an application for 
the gooseberry mildew appeared to materially diminish the injury 
wrought by the currant worm, Nematus ventricosus Klug. The 
moment the spraying commenced upon a busli, all the worms 
‘feeding upon it dropped to the ground as if paralyzed. The 
solution did. not, however, appear to be fatal to them, as they soon 
recovered their activity and disappeared. The sequel showed 
that they did not return to the sprayed bushes to any great 
extent. At least these seemed to suffer no injury from the worms, 
while the unsprayed rows adjoining were nearly defoliated by 
them, although these rows, in common with the sprayed ones, had 
received at least two applications of an arsenical poison. 
For the Codling Moth. 
The observation noted above with reference to the currant 
worm suggested the question if the potassium sulphide had not 
also proved beneficial in repelling the codling moth on the trees 

