Diseases of flowers and other Diseases of flowers and other ornamentals diseasesofflower118smit Year: 1940 94 California Agricultural Extension Service LCir- H8 similar openings. Infection is by spores carried by wind, birds, or in- sects from sporophores on the same or other trees or from dead wood. Since wood decay usually begins in wounds or dead or weakened tis- sue, it naturally follows that prevention must lie along the lines of avoiding these conditions as much as possible and protecting such wounds as do occur to prevent infection and promote healing. In or- Fig. 40.—Sporophores o
Diseases of flowers and other Diseases of flowers and other ornamentals diseasesofflower118smit Year: 1940 94 California Agricultural Extension Service LCir- H8 similar openings. Infection is by spores carried by wind, birds, or in- sects from sporophores on the same or other trees or from dead wood. Since wood decay usually begins in wounds or dead or weakened tis- sue, it naturally follows that prevention must lie along the lines of avoiding these conditions as much as possible and protecting such wounds as do occur to prevent infection and promote healing. In or- Fig. 40.—Sporophores of a wood- decay fungus. chard and shade trees, wood decay starts most commonly in pruning cuts, in the stubs of broken-off and dead branches, or in places where the bark has been killed by sunburn and other injuries. Borers are also often responsible for the beginning of wood decay. To prevent this trouble, trees should be shaped up as early as possible to avoid making large cuts. Heavy limbs should be supported by cables or wires. Broken, badly dis- eased, or dead branches should be cut off. All cuts should be made with sharp tools close to the trunk or supporting limb, and no projecting stubs or torn-down splinters left.
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