^<.- 



a seedling stock and then ^^^f "^^f^l; J^ J°,f Vt j''''' t ^"''''^' "'^ "^^^ -P-^o^t 

 a partially dwarfed tree, or in other words a tp .^ h^^^^^ ^ seedling root 



anS a Mcintosh top, v.ith a section °f 7?,°f °J^|, ^^^ f^^^fing stock in betx^^en. 

 We may briefly describe such a tree ft,s LlcIntgaA/ Mailing ix/ French Crah 

 Seedling." Such a tree §hould not l^e confused. v;ith a Mcintosh on Mailing |X 

 which would be a v«ry dwarf tree. It ^9!^i-4 t>e more like a Mcintosh on Iviklling 

 I or II. (Proo, Arier. Bocs, fgr Hor^. Sol. ^^, page 357.) 



— J. K. Shaw 



MAIIGMESE ^JD^ ?£PPER_ MFIG^HCIES 



It has been shov/ri :^hat def^cienc^les of Bproii and Magnesium sQmetimeg 

 QGOur in'apple trees in Massachusetts. In the area ^D^rdering the Gu^f of 

 MexiQ© and locally in California, deficienQies of other elements haye been 

 found, Perhaps similar deficiencies may appear here. In the Gulf regipji gul- 

 tivatidn of the tung tree is developing rapidly. Oil from tung m%s fiRda 

 many uses in Industry, particularly as a drying oil for painty i-^ h%s teen 

 found ^"hat tung trees sonetimec suffer from a lack of Manganese and Qf Qopper, 

 Pymptoirs cf Manganese deficiency are a ''f ranching" or chlorosis qf the leaves, 

 wxtt; small dead areas and r^/emature dropping of some of the leaves, It is 

 cured by applications of .manganese sulfate. Armoniuiu suifate is beneficial 

 as it increases soil acidity and releases Manganese which is fixh;d in the 

 soil by too little acidity. 



Copper deficiency is indicated by small "cupped" terminal leaves, 



chlorosis, and dying and drcpning of the leaves. Axillary shoot grov/th is 



stimulated and shoot tips die. Application of a vrjak copper sulfate, eithar 



to the soil or as a spray, corrects this condition. (Proc. itoier. Soc . for 



Hort. Sci. 42, pages 74 and 79.) _j_ ^^ 2^^^^ 



THE YELLOV / -RED VIRQSI3 



The "X-disease" of peaches is now acquiring a real name. It v/ill be 

 known as the Yellow-Red Virosis, because it turns peach leaves yellow and choke- 

 cherry leaves red. It vms discovered in Connecticut in 1933. It had doubt- 

 less been present there and probably in Massachusetts before that time. It 

 was discovered in the Iludsoii Valley in 1938 and is now pretty well spread 

 over the northern part of the peach country. A recent bulletin of the Geneva 

 Experiment Station reports the results of a study of the disease in that state. 



It is caused by a virus vihich is "an exceedingly minute infective principle 



not visible under the highest magnification of the microscope." The chokecherry 

 is very susceptible, and the virus is supposed to be carried to the poach by 

 some insect v/hose identity has not yet been discovered. It may pass from peach 

 troo to peach tree, but less rapidly. It may also be transmitted by buds from 

 diseased trees. Chokech^irry bushes must not bo allov/ed to grow v;ithin 500 feet 

 of a peach orchard. Sodiujn chlorate and ammoniuin sulfamate vjoro the only ma- 

 terials found satisfactory for killing chokecherries. Ho poach variety oscapod 

 the disease vjhen inoculated with virus-infected tissue but possibly some var- 

 ieties Jvre less susceptible than others. The common black cherry does not 

 carry the disease. (N.Y. State Agr. Expt. Sta. Bui. 704.) 



— J. K. Shaw 



