\ 
154 REPORT OF THE HORTICULTURIST OF THE 
forty-three — about 7 per cent, while in 133 plants not treated, 
fifteen were affected, or about 11.3 per cent. 
As these plants were all seedlings from native varieties, and are 
not all subject to mildew, these figures are only an indication of 
the effects of the treatment and not a proof, for I do not. know 
how many plants in the treated rows would have been affected 
had the applications not been made. There could be no question, 
however, as to the benefits resulting from the treatment. The 
sprayed rows were conspicuous for the richer green of their foli- 
age as far as the plantation could be seen; and the row receiving 
the stronger solution showed somewhat greater vigor than the 
other. A part of this benefit, however, probably resulted from 
the influence of the sulphide in destroying or repelling the cur- 
rant worm,* as the treated plants were noticeably less injured by 
this insect than the others. A part also may have resulted from 
the fertilizing effect of the potash applied. 
In the latter part of the summer, after the spraying had been 
discontinued, the mildew increased on the treated plants, showing 
clearly that the applications were beneficial, and also that they 
must be continued throughout the growing season to confer 
their greatest benefit. 
‘ e 
Sopa HyposuLPHITE CONTRASTED WirH Porasstum SULPHIDE AND 
CALCIUM SULPHIDE FOR THE APPLE SCAB. 
In former reports +t are given the results of experiments with 
soda hyposulphite for the apple scab, Fusicladium dendriticwm 
Feckl. From these it appears conclusively that this substance as 
used, acted beneficially, but that it was not a complete remedy for 
this disease. It is very desirable that some substance be found 
that will prove more effectual in destroying the fungus without 
causing greater harm to the foliage. Two other compounds of 
sulphur, viz., potassium sulphide and calcium sulphide, were there- 
fore tested the past season. The first trial was made with the 
potassium sulphide in solution, at the rate of half an ounce to the 
gallon, upon the crab apple tree treated for three seasons pre- 


*See note on Potassium Sulphide as a destroyer of insects. 
+See Reports New York Agricultural Experiment Pion | 1885, pages 
231-2; 1886, pages, 177-8; 1887, pages 99-101. 

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