aPKAYINti WIIEKE SEVKKAL DISEASES ARE PRESENT. 177 



Thorough spi-:iy work reiiuirt's thiit the .sprays l)oap})liecl in as calui 

 weather as possihU', AViiul o-reatly retards and lowers the class of 

 work done. Spra3's should likewise not be applied when the twigs or 

 limbs of the trees are covered l)y frost, snow, or sleet, or hy the water 

 of rains, dew, or hea\y fogs. To avoid the presence of hanging drops 

 of dew upon the limbs, it is frequently necessary to delay spraying 

 until late in the morning. Such delay is prefera])le to the application 

 of spray to the dripping trees. When the twigs are dry the spra}' 

 dries where it strikes, and succeeding dews or showers, if the latter 

 arc not too heavy, will not Avash oif the spray to a very injurious 

 extent. 



If the sprayer is provided with suital)le extension pipe and nozzle 

 with lateral discharge, the work of spraying peach trees of ordinary 

 size ma}^ be rapidly and easily done. T'he cone of spra}'^ is tirst turned 

 upward under the base of one of the main limbs of the tree and the 

 pipe, moved so that the spray passes outward toward the end of the 

 limb, spraying the entir(^ under surface of the limb from l)ase to tip. 

 The sides and top of the limb are now sprayed, togetinu" with all of 

 its terminal branches and twigs. PLach main limb of the tree is treated 

 in like maimer, the sprayer passing about the tree as the work is com- 

 pleted. The habit of actively moving the nozzle back and forth while 

 at work will soon l)e acquired by the workman desirous of doing good 

 work, and by this means the most uniform spraying is accomplished. 



SPRAYING WHERE OTHER DISEASES ARE PRESENT WITH CURL. 



There are many peach diseases which may coexist upon the tree 

 with curl. jNIany of these are amenable, in whole or in part, to treat- 

 ment adapted to the control of curl, but in some cases where two or 

 more are present it may be advisable to make slight alterations in the 

 treatment. The following notes on some of the more common dis- 

 eases may prove of value. 



PRUNE RUST ON THE PEACH (Puccinia pruni FeTS.) . 



It is a fact which does not appear to be generally known that prune 

 rust infests the tender branches of the peach as well as its leaves. 

 This has been found especially true in young trees. Spore clusters are 

 found upon the 3'oung shoots before growth begins in the spring, 

 showing that the disease winters over by means of spores produced 

 upon and remaining attached to the branches, as well as by the spores 

 produced upon the leaves and scattered over the tree. Where the 

 trees are suffering from rust it is therefore apparent that a thorough 

 winter treatment is required to clean the tree and prevent the spring 

 infection, hence such spraying is recommended for the control of both 

 curl and rust, though the full control of the latter disease is very 

 19093— No. 20 12 



