U. S. EXPERIMENT STATION BULLETINS. 

 Table III. — Showing kind and amount of fertilizer used. 



407 



At time treatments began the branches lacked several feet of touching 

 those of neighboring trees; at present they touch or nearly touch. 



Now for results. In addition to Table II, which states the cases by 

 years, it will be sufficient to give the per cent, of cases which have 

 appeared on the control, and on the treated plats since the first appearance 

 of the disease: 



Table IV. — Shoiving per cent, of cases of peach yellows before and after three years' 1 

 treatment {preventive) ivith the Goessman-Penlialloiv mixture. 



Had the trees on the treated plats remained healthy while those on the 

 untreated one contracted the disease, the evidence in favor of the mixture 

 would have been reasonably conclusive, because the experiments were 

 conducted in a region eminently suitable for a test case. 



It is apparent that, so far from responding to treatment, plats A and B 

 show a large increase of cases, while plats C and D actually show a larger 

 per cent, of cases at the end of three years than does the untreated one. 

 Another point: With exception of B, the cases are more numerous the 

 third year than any preceding year. It will also be observed that the three 

 plats now most affected are the very ones which have received most fer- 

 tilizers, and especially most of the so-called specific, muriate of potash. 

 Whether this is merely accidental, or is really due to excessive fertilization, 

 is a question I do not wish to raise at this time. 



The only point I desire to make is that a practical test on a large scale, 

 covering a period of three years, and in one of the best possible localities 

 for such a test, has shown that this mixture is practically worthless as a 

 remedy for peach yellows, and has also shown that it has no efficacy even 

 as a preventive. 



Had these substances been used only one year, it might have been 



