150 EXPERIMENT STATION RECORD. 



trees treated with heavy a])i)lications of fertilizers, etc.. have shown similar 

 injury. 



Until more is known about the peach crown gall, the author advises the same 

 precautions for it as for the apple gall. 



In regard to crown gall of the dwarf trees and of the quince, no recommen- 

 dations are made, as a large proportion of such trees are affected by the disease 

 in the nursery and further experiments must be made to ascertain what injury 

 is produced before the fruit grower will be justified in destroying such trees 

 because of the hairy root form of the crown gall found on them. 



After noting the characteristics of and damage done by peach yellows, peach 

 rosette, little peach, and peach leaf curl, the author sums up the results of ex- 

 periments and observations on the peach yellows as follows: Peach yellows has 

 now reached the main peach sections in the United States, down almost to 

 Georgia and Alabama, and is generally prevalent in orchard and seedling trees 

 along roads, hedges, etc., but does not seem to have reached the peach sections 

 of the far West. It is transmitted by peach pits and by buds from diseased 

 trees to tlie nursery. From the nursery it is carried to the orchard, where 

 it is able to spread from one orchard to another. Control must be begun by 

 the nurseryman getting healthy peach pits and healthy scions for propagating 

 purposes. As the disease seldom shows up in the nursery row, it is necessary 

 to keep careful data on young orchards to find out what nurseries are distribut- 

 ing diseased trees. 



In experiments with buds from diseased trees, the trees that grew as healthy 

 as any in the nursery developed the disease the following year in the orchard 

 in more than 90 per cent of the trees. The disease does not spread very quickly 

 in the orcliard, as trees may stand in close proximity to diseased trees for 3 

 or 4 years without showing symptoms. Buds from diseased trees inserted into 

 orchard trees produce yellows on these trees very quickly, usually within 12 

 months' time. The disease can be readily controlled in the orchard, if 

 orchardists will plant healthy trees and see that all orchards in their vicinity, 

 as well as their own, are systematically inspected and the diseased trees 

 promptly destroyed. It does not seem desirable to replant orchards where 

 diseased trees have been removed after they are 4 years old. 



Notes on Sclerotinia fructigena, J. B. Pollock (A6«. in Science, n. ser., 31 

 (1910), No. 794, P- 437). — It has been held by some Euroijean authors that the 

 species of Sclerotinia attacking stone fruits in the United States is »Sf. cinerca 

 and not 8. fructigena, as has been generally assumed. Studies have therefore 

 been made of material collected at various places and compared with reports 

 of various workers in Europe and the United States. 



The apothecia found in Michigan as well as in other parts of the United 

 States agreed very closely with 8. fructigena as foimd in Europe. In the 

 United States the species occurs more commonly on stone fruits, while in 

 Europe it is most common on pome fruits. 



The author believes that in all probability the species described as Sf. fructi- 

 cola is identical with /S?. fructigena. 



The control of peach, brown rot and scab, W. M. Scott and T. W. Ayres ( V. S. 

 Dept. Agr., Bur. Plant Indus. Bui. 174, pp. 31, pis. If, fig. 1). — A report is given 

 of 3 years' demonstrations and experiments with self-boiled lime-sulphur mix- 

 ture for the control of peach brown rot (Sclerotinia fructigena) and peach scab 

 (Cladosporium carpophilum) . The experiments were begun in 1907, continued 

 on a larger scale in 1908, and in 1909 the treatment was demonstrated on a 

 block of more than 5,000 trees. 



The author states that if self-boiled lime sulphur is properly prepared and 

 applied there is very little danger of injury to the fruit or foliage. There is 



