274 Report OF THE HORTICULTURAL DEPARTMENT OF THE 
garding the value of an excess of lime in preventing injury from 
bordeaux mixture. 
(b) As to the control of the scab fungus.— Does an excess of 
lime hinder the action of bordeaux mixture as a fungicide? Sev- 
eral writers have suspected that lime in a greater quantity than 
enough to satisfy the immediate chemical changes which take 
place will suspend the fungicidal properties of bordeaux mixture. 
Among these are Lodeman‘’® who states that there is such a 
suspension though he draws the conclusion from theoretical 
considerations and not from experimental work. Clark*®® holds 
that while the solution of copper is possible in the presence of 
an excess of lime it is apparently detrimental to the solvent 
action of copper. According to Schander:*! “A too great excess 
of lime affects a great dilution of copper hydroxide in the mix- 
ture. In this way the fungicidal action of the mixture is weak- 
ened.” Still others might be quoted but their conclusions would 
fall in for most part with one or other of those given above. 
The season’s experiments with bordeaux injury throw some 
light on this question. I must hasten to say, however, that these 
experiments were not planned, primarily, to control scab; and that 
as there was comparatively little of the scab fungus in 1906, the 
results as here set forth are to be looked upon as suggestive rather 
than conclusive. | 
In order to make a fair comparison of the results attending — 
the use of a moderate amount of lime (one part each of lime 
and of copper sulphate), and a considerable excess (one part of 
copper sulphate and two of lime), each of the nine plats must 
be divided into three parts, for there are two varieties and the 
plats were divided as to time of spraying. The tables show varie- 
ties and times of spraying as follows: Table VII, Rhode Island 
Greemmg trees, one tree in each plot, sprayed during rain June 5 
and June 12; Table VIII, Baldwin trees, two trees in each plat, 
sprayed during dry weather May 31 and June 12; Table IX, Rhode 
Island Greening trees, two trees in each plat, sprayed during dry 
weather May 31 and June 12. 

” Lodeman (37, p. 128). 
Poelatlehd Ts pad): 
“ Schander (53, p. 583). 
