Diseases of economic plants (1910) Diseases of economic plants diseasesofeconom02stev Year: 1910 PIS EASES OF SPECIAL CROPS 111 adjacent cedar trees, and there produce swellings upon the branches and twigs during the fall and winter. In the spring, these give origin to long gelati- nous horns, which consist of masses of spores embedded in a matrix of jelly. These spores upon drying are conveyed to the quince tree by the winds, and there produce again the quince rust. The cedar is a necessary resting place for this fungus dur- ing the winter. The remedy there- fore is, if possible, to remove
Diseases of economic plants (1910) Diseases of economic plants diseasesofeconom02stev Year: 1910 PIS EASES OF SPECIAL CROPS 111 adjacent cedar trees, and there produce swellings upon the branches and twigs during the fall and winter. In the spring, these give origin to long gelati- nous horns, which consist of masses of spores embedded in a matrix of jelly. These spores upon drying are conveyed to the quince tree by the winds, and there produce again the quince rust. The cedar is a necessary resting place for this fungus dur- ing the winter. The remedy there- fore is, if possible, to remove the cedar trees from the neigh- borhood of quince trees. This will al- most entirely pre- vent the rust, although in rare in- stances a few spores may be carried a considerable dis- tance. Reasonable protection is secured if all of the cedar trees in the immediate vicinity of the orchard be removed. In case the cedar is too abundant to permit of its complete removal, resort must be had to spraying the leaves and fruit of the quince trees with the Bordeaux mixture at the time when the rust spores are expected to arrive; that is, Fig. 47.—Quince knot caused by the rust fun- gus. After Bailey.
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