. The more important fruit tree diseases of Ontario [microform]. Fruit; Pulvérisation et poudrage en agriculture; Spraying and dusting in agriculture; Fruits; Exploitations agricoles. 33 Plum Klst (Pucviniu pruni spinosae, I'trs.). This disease is octasionaliy ob^vrved in Ontario onhards, but bus never been recorded as doing any serious damage. It proiiuces small, dark brown pustules on the under surface of the leaves In severe attacks premature defoliation may be caused. Lkaf Spot. Siiot-Holk Fuxgus, Ykllow Leaf Disease of Ciiehries axd Pli ms. nl„ J'"'T^"r7 '°™""'" ^
. The more important fruit tree diseases of Ontario [microform]. Fruit; Pulvérisation et poudrage en agriculture; Spraying and dusting in agriculture; Fruits; Exploitations agricoles. 33 Plum Klst (Pucviniu pruni spinosae, I'trs.). This disease is octasionaliy ob^vrved in Ontario onhards, but bus never been recorded as doing any serious damage. It proiiuces small, dark brown pustules on the under surface of the leaves In severe attacks premature defoliation may be caused. Lkaf Spot. Siiot-Holk Fuxgus, Ykllow Leaf Disease of Ciiehries axd Pli ms. nl„ J'"'T^"r7 '°™""'" ^T"'"" '" ^"^""" °" *"^ «"'! cultivated cherries plums. It is to be seen nearly every year and in wet seasons may very seriously injure cherry trees. Both sweet and sour cherries are frequently completely d- fohated . ,t in wet summers. In the years 1915 and 1916, it was particiilarly. Leaf Spot or Shot hole Fungus on cherry and plum. (Original * bad It is usually recwded as being wcrst on cherries, but here in Ontario It has been just as destructive, if not more so, to sour cherries The disease on the different species of cultivated and wild cherries and plums IS not all caused by the same fungus. Three closely n^lated species of fun^i eld confined to species of cherries or plums, have been^ound to c^use , causes the disease on sweet and sour .ultiv^t d EuroZn'lnd^''' "'' ''''''}''''' '' V'-unipkorae, 11. on cultivated plum f the European and American varieties and on two species of wild plum, C. Ulescens H on wild black cherry, choke che-~ and perfumed cherry. ' ^y^ptoms These vary with different hosts. On the leaves of plums and wild cherries brown spots are produced, which soon fall out, leaving little holes,. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of th
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