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Image 8 of Kentucky fruit notes, vol. 4, No. 5, Fall 1951

Part of Kentucky Agricultural Experiment Station

[twas especiallygratifying that Concord and Fredonia, two Pea} gf the varieties whose fruits have been most outstanding, also mth proved to be hardy enough in vine to survive the very severe Spr; 1 winter of 1950-51. These two varieties can be planted with rea- i sonable assurance that they will not be winter killed. However, most varieties if planted on well-drained sites can be expected to ` V survive all but the most severe winters. i DORMANT SPRAYS IMPORTANT THIS WINTER , W. D. Armstrong Fe`: wes As a result of the record sub-zero weather of February sca 1951, a number of Kentucky orchard men failed to apply a dor- tot * mant oil spray, for fear of causing additional tree injury, since it, the is a well known fact that dormant oil sprays have caused addition- the 1 ` al damage when they were applied just before or just after sub- of < zero cold periods. Also, due to the fact thatmostKentucky peach orchards received no summer sulfur sprays, there would be a special need for a dormant spray to head off serious peach leaf We ` curl damage. Recent experiences in Kentucky and nearby states kilt ` have shown that heavy sprays and dusts of sulfur for summer con- Om . trol of brown rot will also control peach leaf curl the following W1 spring without the use of a dormant fungicidal spray. However, gu] where the summer spray applications were not applied to peaches de _ as in 1951, there is a special need for fungicidal dormant sprays. Since the 1951 season was warm and favorable for the in- tm crease of scale insects, growers who have a scale problem bk shouldmake preparations for a dormant oil spray on both peaches br . ` and apples. Where an oil dormant spray is to be used, exper- SO 1 ience has shown that it is safer to wait until February to make Ou this application than to do so in December before heavy winter weather sets in. For apples, a 2 or 3 percent dormant oil emul- ly sion spray or miscible oil spray, well applied, will take care of go the scale insects as well as eggs of the European red mite. When (at a DN material is added to this mixture, eggs of the rosy aphid BE will also be controlled. For peaches, a Z or 3 percent dormant ml oil spray combined with a 4-4-100 bordeaux mixture, applied be- G1 C fore any growth starts i.n the spring, will control peach leaf curl and will also go a long way toward checking scale. Wf Where scale is not a problem in peach plantings, a dor- ` mant spray for leaf curl will still be needed and this spray of , ithT 4-4-100 bordeaux mixture or six gallons of liquid lime Sul- he . fur per 100 gallons can be applied safely in either the late fall af- N( V ter the leaves come off or early spring before growth starts. The reason this spray is absolutely safe in the fall is that it contains I I no oil. As a final word of warning to all orchard men: Consider 3 your dormant sprays for 1951-52. n 8 jg.