Common Cultural: Marginal leaf necrosis categories: Common Problems Cultural Problems revision date: 2022-11-01 09:21 Marginal leaf necrosisPhoto by: R.S. Byther Biology Marginal leaf necrosis can be caused by numerous factors that restrict the flow of water to the leaves, such as drought, salt damage (fertilization), root rot, cankers, excessive heat, and chemical injury. Symptoms include […]
Common Cultural: Morphological changes categories: Common Problems Cultural Problems revision date: 2022-11-01 09:17 Biology
Common Cultural: Mosses and lichens categories: Common Problems Cultural Problems revision date: 2022-10-31 02:56 Lichen on rhododendron branches closeupPhoto by: C.R. Foss Biology Mosses and lichens are primitive plants often found growing on the bark of older trees and shrubs. They are typically grayish, greenish, or orange in color and may be flat or branched. […]
Common Cultural: Needle loss categories: Common Problems Cultural Problems revision date: 2022-10-31 02:48 Pine natural needle dropPhoto by: R. Maleike Biology Conifer trees periodically shed older needles. In the early fall following a dry summer, western red cedar often dramatically shed older needles; this is known as cedar flagging. Broadleaf evergreen plants also show periodic […]
Common Cultural: Needle tip necrosis categories: Common Problems Cultural Problems revision date: 2022-10-31 02:43 Needle tip necrosis on sprucePhoto by: R.S. Byther Biology Needle tip necrosis can be caused by numerous factors that restrict the flow of water to the leaves, such as drought, salt damage (fertilization), root rot, cankers, excessive heat, and chemical injury. […]
Common Cultural: Nutrient deficiency categories: Common Problems Cultural Problems revision date: 2022-10-31 02:40 Interveinal chlorosis symptoms of iron deficiencyPhoto by: R. Maleike Biology An insufficient supply of mineral nutrients can result in a variety of symptoms on plants. Nitrogen deficiency typically causes a chlorotic yellowing of older leaves. Iron deficiency symptoms are observed on the […]
Common Cultural: Oedema categories: Common Problems Cultural Problems revision date: 2022-10-31 02:07 Watery blisters on hosta leaf from oedemaPhoto by: R.S. Byther Biology Oedema usually appears first on the lower leaf surface as watery blisters. As they age they become brown, yellow, or rust-colored and may resemble disease symptoms. It is very common on geranium […]
Common Cultural: Overwatering or poor drainage categories: Common Problems Cultural Problems revision date: 2022-10-31 01:58 Standing water at base of tree from overwateringPhoto by: R. Maleike Biology Overwatering or poor drainage (wet soil) can cause the death of plant tissue from the ends of branches to the entire plant. Symptoms often initially appear as wilting, […]
Common Cultural: Plant girdling and circling roots categories: Common Problems Cultural Problems revision date: 2022-10-31 01:53 Complete dieback caused by girdling at the crownPhoto by: R.S. Byther Biology Girdling interrupts the flow of manufactured food, hormones, and other metabolites from the leaves to the roots. The roots may eventually starve, and then the top branches […]
Common Cultural: Poor pollination categories: Common Problems Cultural Problems revision date: 2022-10-31 10:50 Poor pollination on cherryPhoto by: R.S. Byther Biology Fruit may fail to develop properly or may drop prematurely if pollination is poor. Several factors may cause poor pollination. Some fruit trees require a tree of a different variety for viable pollen. Cold […]