-3- 



sulfur-lead arsenate sprays is likely to result in narked fruit russet 

 on Red Delicious and Baldwin, and lime is not a reliable corrective for 

 this injury. Sulfur sprays and dusts are injurious to grape foliage, and 

 they are ineffective against the rust diseases as well as Brooks' fruit 

 spot and bitter rot of apple and quince. 



5. Best Use on Apples ; As a protective spray for scab control, applied 

 before or during infection rains, in the pre-blossom, blossom, and post- 

 blossom sprays; on all scab-susceptible varieties except those subject to 

 fruit spray russot. The protective value of sulfur against apple scab is 

 increased v.'hen sulfur is combined v/ith Ferraate. 



DUST JUG SULFUR 



1. Properties: As a rule sulfur dusts are not as effective for pro- 

 tecting fruit crop against diseases as an equal number of applications of 

 wettable sulfur sprays, principally because dust deposits adhere less well 

 to foliage and fruits than spray deposits, even when dusts are applied to 

 damp trees. Dusting damp plimts results in heavier initial deposit and a 

 longer lasting residue than dusting dry plants, but the sulfur deposit on 

 dry leaves and fruits may be more evenly distributed. Yflien applied to 

 apples and peaches, sulfur-lead arsenate dusts usually result in less sulfur 

 and arsenical injuries than sulfur-lead arsenate sprays, particularly on 

 peaches, 



2, Best Use; An all-dusting program is likely to give more satisfac- 

 tory control of peach diseases than apple scab especially in Mcintosh and 

 other highly susceptible apple varieties. On such varieties, dusting is 



best considered a supplement to spraying, that is, to insure prompt protection 

 aliead of or during a rain p'jriod; also at a time v.-hen soil conditions make 

 it difficult to transport a heavy spray rig through the orchard; and for 

 a quick "once-over" around mid-bloom. Once apple scab is under good control 

 and the period for primary infection is past, dusting might be considered 

 "standard" for the remainder '^f the season. One "best place" for sulfur 

 dusting is on peaches prior to and during the picking season to control 

 hrovm rot, with the least amount of fungicidal residue on the fruit. 



LttlE SULFUR 



1, C ommon Uses • Lime-sulfur remains a straidard fall or spring dor- 

 mant spray for the control of poach leaf curl, 7-100 of liquid or 18-100 



of dry lime-sulfur. It likewise is comi.ionly used as a delayed dormant spray 

 (10 gal, -100 gal,) and pre-blossom spray (2-100) on red raspberries for 

 control of anthracnoso. As a summer spray on apples (2 gal, -100 gal.) it 

 is more effective against scab tuid black rot than the best v/ettable sulfurs, 

 but it is considered t >p injurious to be used CJbher thwi as he. SJaergeaaoy 

 spray, 



2, Properties ; The elemental sulfur deposit resulting from the 

 soluble sulfurs in the lime-sulfur spray is considered superior to the 

 deposits of wettable sulfurs in withstanding weathering — in ether words, 

 more adherent. Lime-sulfur is far iuore injurious tn foliage and fruits of 



