Diseases of fruits and nuts Diseases of fruits and nuts diseasesoffruits120smit Year: 1941 Diseases of Pruits and Nuts 131 whole top or those on certain branches tnrn yellow, then brown, and fall prematurely. The stock usually throws out suckers and the top dies. Ex- amination shows a black line of dead tissue at the union between the top and rootstock where the growth of the last few years has failed to unite, resulting in a girdling of the tree or branch. This results in a dying of Fig. 72.—Leaf scorch of walnut. the black walnut bark, beginning at the union and progressing down- ward.
Diseases of fruits and nuts Diseases of fruits and nuts diseasesoffruits120smit Year: 1941 Diseases of Pruits and Nuts 131 whole top or those on certain branches tnrn yellow, then brown, and fall prematurely. The stock usually throws out suckers and the top dies. Ex- amination shows a black line of dead tissue at the union between the top and rootstock where the growth of the last few years has failed to unite, resulting in a girdling of the tree or branch. This results in a dying of Fig. 72.—Leaf scorch of walnut. the black walnut bark, beginning at the union and progressing down- ward. No explanation for this trouble has been found. The tops or branches of trees which show this condition may be cut off and some of the black walnut suckers which grow from below the union may be grafted with scions of the desired variety of English wal- nut to make a new top. Inarching such suckers on the old top does not seem promising on account of the ai-ea of dead bark which will be left at the original union.
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