[Fruit culture] . tch, and also ascloiid. Although the disease is commonly spoken of as two dis-tinct diseases, authori- __^ties are generally agreed J j^that both conditions,that is, the small blackspecks that closely re-semble fly specks andarranged in clusters andthe black soot-likeblotches, are caused bythe same fungus. How-ever, some apples mayshow only the sootyblotches and otherapples only the fly-speck spots. Both thesmall specks and theblotches appear aboutthe time that the applesbegin to maXvse and thespecks or the blotchesdevelop more rapidlyduring moist weatherand in orchards withd
[Fruit culture] . tch, and also ascloiid. Although the disease is commonly spoken of as two dis-tinct diseases, authori- __^ties are generally agreed J j^that both conditions,that is, the small blackspecks that closely re-semble fly specks andarranged in clusters andthe black soot-likeblotches, are caused bythe same fungus. How-ever, some apples mayshow only the sootyblotches and otherapples only the fly-speck spots. Both thesmall specks and theblotches appear aboutthe time that the applesbegin to maXvse and thespecks or the blotchesdevelop more rapidlyduring moist weatherand in orchards withdense foliage than dur-ing dry weather or in an orchard where the trees are openheaded and well pruned. The market value of apples that are badly discolored by flyspeck or sooty blotch is often materially reduced. The diseaseis easily controlled by the sprays recommended for bitter rot. 71. Apple Rust.—Orchards in the vicinity of cedar treesare subject to a disease known as apple rust, also as cedar rust 248—22. Fig. 59 72 APPLE PESTS AND INJURIES §6 and as ntst. This disease is usually easily recognized by theyellowish orange-colored spots on the leaves. Although thespots occur also on the fruit and the twigs, the spots on theleaves are by far more common and more noticeable than arethose on the fruit or the twigs. The appearance of this diseaseon infected leaves and twigs is shown, in Fig. 59. The effectof the disease on the fruit is shown in Fig. 60. The fungus thatcauses this disease spends the winter on cedar trees, producingon them growths, or knots, known as cedar apples. In Fig. 61are shown cedar apples in three stages of maturity. In (a) isshown a cedar apple as it appears during early winter; duringthe spring these cedar apples or gall-like growths appear asshown in (6); and in (c) is shown the large gelatinous growth
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Keywords: ., bookcentury1900, bookdecad, booksubjectfruitculture, bookyear1912
