





as was tikan fe cover every Sua of every int with the spray 
since the object of the spray is not to kill the fungus in the th 
affected plant, but to prevent its spreading to healthy foliage and» br we 
infecting the new leayes. Any application strong enough to i | ; 
the fungus within a diseased plant would also kill the plant. oe 
After an interval of nine days, the beans were sprayed aga n> 
the third treatment followed the second at an interval of twe aty 
three days; and finally after another interval of eighteen days. 
fourth treatment was made. No unyielding rule for the number 
or frequency of treatments can be given. If rains are abundant, 
‘and the fungicide is washed off from the leaves, the foliage must 



















again be covered with the spray in order to ward off the disea: S 
i On the other hand should pleasant weather prevail, and the fung 
“ : nh cide remain on the foliage, it will not be necessary to spray agai 
me, mt i until suflicient new foliage has grown out to justify another tre: 
ment. With field beans three sprayings may prove sufficient, bu C 
probably Snap or string beans may profitably be given four treat- : 
“aie ‘ments, but, as before stated, no invariable rule can be piven. In 
the following table a comparison is made of the yield of esi 
treated with the different fungicides, counting the yield. of the 
Bordeaux-sprayed plants as 100. The amount of damae from. 
anthracnose is deducted in each case. In column I, the yield is — 
computed from the total number of pods produced, and column 
IL gives the yield by weight of the total number of pods. ; A 


a | a 
Yield by Yield ee 
number of i boner . t 
wee pods. 
my CUpric borate... eae eee wie cleo tie wees 56 
Bem Uir eae 604i 0 5 3 leu’ wien i Lae conince ee 64 
ee eAmpric polysulphide’ ai) 0.06 2... eid cine Te 
‘Untreated egiks Ne oh nEaas Mater i BO eae 
_ Bordeaux mixture .. ‘ ite 
RCRD, 2.5055 5 oie a mie WI lee Oe ee lee 

