. The encyclopedia of practical horticulture; a reference system of commercial horticulture, covering the practical and scientific phases of horticulture, with special reference to fruits and vegetables;. Gardening; Fruit-culture; Vegetable gardening. WALNUT DISEASES 2013 regular concentric manner. Experience has amply demonstrated that our native black walnut roots are immune to this fungus and we have seen cases where English walnut, prune, almond and other roots have been picked out and killed, while northern California black walnuts interplanted with these trees remained en- tirely unaffec
. The encyclopedia of practical horticulture; a reference system of commercial horticulture, covering the practical and scientific phases of horticulture, with special reference to fruits and vegetables;. Gardening; Fruit-culture; Vegetable gardening. WALNUT DISEASES 2013 regular concentric manner. Experience has amply demonstrated that our native black walnut roots are immune to this fungus and we have seen cases where English walnut, prune, almond and other roots have been picked out and killed, while northern California black walnuts interplanted with these trees remained en- tirely unaffected. It is altogether prob- able that all of our black walnut species and hybrids are highly resistant if not totally immune to this Fig. 1. Walnut Killed by Root Rot. Armillaria mellea. Seedling Root Rot—Wilt Nursery seedlings of the Southern Cal- ifornia black walnut occasionally wilt and die rather suddenly, and show, on exam- ination, a black rot of the main root just below ground. This may appear either before or after grafting, and, ordinarily, at the worst, picks out only a tree or two here and there, even in a large nursery. We have known of only one case where serious loss was experienced from this source, and this on poorly drained land where the trees were injured by an excess of water. The trouble is caused by a soil fungus, and seems to be confined to the Southern California black. Sliriveled Meat Much trouble is experienced with wal- nuts in certain seasons on account of the meat being shriveled and poorly devel- oped. This affects some varieties and some individual trees more than others, and is often much worse the same year in certain localities than in others. The trouble is more apt to affect varieties which come out late in the spring than those which develop early. The cause of this poor development or shriveling of the meat has been ascribed to various in- fluences, none of which have been posi- tively proven to bring about this troublOc The in
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