Show spray controls bacterial spot disease dise ase of peaches found in orchards in different section s I 1 prepared pared by bi tai the e united states state department of culture cul A new spray containing zinc and lime which promises to give commercial control of bacterial spot of peaches lias been developed by the united states department of agriculture this discovery Is especially important since this Is the first time so far as known that a bacterial disease 11 bease of fruits has licen brought under direct control by spraying disease long known bacterial spot has been known to plant disease specialists for about 20 years but it Is only within the past 10 or 12 years that the disease has I 1 become seriously destructive ever extensive areas it occurs in practically all peach sections of the eastern halt half of nf the country but causes serious loss mainly lu in sections in which the soils are light and comparatively low in fertility tests carried on in southern indiana and in arkansas haye haxe shonn that six applications of the spray at intervals of two weeks beginning at petal fall greatly decrease the effects of the dl als ease with no injury to fruit or foliage bollag e in addition there was a stimulation which resulted in larger and darker green leaves it was found also that lead arsenate might be used in connection with wit this material thus reducing labor costs its composition the spray solution Is prepared by using 4 pounds of zinc sulphate 4 pounds of hydrated lime and 50 gallons of water one pound of aluminum sulphate may be added where agitation Is poor or entirely lacking as this helps to keep the material in suspension one of the first recommendations in fit the control of bacterial spot of peaches Is to keep the orchard in a high state of vigor 0 through good cultivation pruning fertilization control of borers etc in spraying it Is necessary to cover the fruit and the under side of the leaves thoroughly |