Common Cultural: Air pollution categories: Common Problems Cultural Problems revision date: 2022-11-01 11:39 Air pollution damage on dahliaPhoto by: R.S. Byther Biology Generally, air pollution damage in the Pacific Northwest has been considered limited. Sulfur dioxide damage from large industrial emissions has been known to cause interveinal bleaching on dahlia, interveinal spotting on lilac, and […]
Common Cultural: Chlorosis categories: Common Problems Cultural Problems revision date: 2022-11-01 11:35 Chlorosis on Japanese spurge caused by excessive sunlightPhoto by: R. Maleike Biology Chlorosis is the fading of the green color in plant leaves. It can be caused by environmental stress, nutrient deficiency, chemical deficiency or injury, disease, and the feeding of insects or […]
Common Cultural: Construction damage categories: Common Problems Cultural Problems revision date: 2022-11-01 11:30 Tree root damage and dieback from constructionPhoto by: R.S. Byther Biology Disturbances in the root zone such as cutting roots, covering roots with sidewalks or pavement, adding a layer of topsoil, changing soil grade, or changing water drainage patterns can damage or […]
Common Cultural: Desiccating wind categories: Common Problems Cultural Problems revision date: 2022-11-01 11:26 Winter desiccation on rhododendron leavesPhoto by: R. Maleike Biology Dry, cold wind, usually from the north, results in desiccation (dehydration) of plant tissues. During periods when the soil is frozen, water movement slows or stops in plant tissue, enabling wind to dehydrate […]
Common Cultural: Drought damage categories: Common Problems Cultural Problems revision date: 2022-11-01 09:46 Dead upper branches on conifer from drought damage Photo by: R.S. Byther Biology Marginal and tip leaf necrosis may result when insufficient moisture is available to broadleaf plants. The terminal growth and sometimes side branches on conifers may die because of excessive […]
Common Cultural: Fasciation categories: Common Problems Cultural Problems revision date: 2022-11-01 09:42 Fasciation showing a flattened, twisted, ribbed stemPhoto by: R.S. Byther Biology Fasciation occurs in many kinds of plants, both woody and nonwoody. Stem growth becomes flattened and often takes on a dramatic twisting due to changes in the genetics of the growing point […]
Common Cultural: Fertilizer burn categories: Common Problems Cultural Problems revision date: 2022-11-01 09:37 Marginal leaf necrosisPhoto by: R.S. Byther Biology Excessive use of fertilizers can damage or kill plants. High levels of salts in the soil will damage plant roots, resulting in reduced water uptake. The salts may also accumulate in leaf tissues, causing a […]
Common Cultural: Frost injury categories: Common Problems Cultural Problems revision date: 2022-11-01 09:34 Flower bud damage on rhododendronPhoto by: R.S. Byther Biology Frost can damage new growth and flowers in the spring. Severity and distribution will depend on stage of plant development and where plants are growing; low-lying areas often act as frost pockets. Symptoms […]
Common Cultural: Hail damage categories: Common Problems Cultural Problems revision date: 2023-01-09 12:00 Tattered leaves and pear fruit damaged by severe hailstormPhoto by: M. Bush Biology Hail damage can vary from minor leaf spots and shredding to complete defoliation. Scarring of fruit may also occur. Minor damage may not be immediately apparent. Distribution of damaged […]
Common Cultural: Lime-induced chlorosis categories: Common Problems Cultural Problems revision date: 2022-11-01 09:23 Lime-induced chlorosis on rhododendronPhoto by: R.S. Byther Biology Lime-induced chlorosis is a yellowing of leaves caused by alkaline soil conditions. High alkalinity (high pH) of soils can make iron or manganese less available to plants, resulting in symptoms of nutrient deficiency in […]