主机
Freeman maples, silver maple, river birch, Swedish columnar aspen
河桦树叶,脉间褪绿 (Esther McGinnis, NDSU)
症状
- Leaves turn yellow-green or bright yellow but veins remain green (interveinal chlorosis)
- In severe cases, leaf margins may turn brown and appear scorched
- 症状首先出现在枝条尖端的新叶上
- Over time, twigs and branches may die back from the crown
- Eventually, the tree may die if the iron deficiency persists for years
Branch dieback on silver maple (Joseph Zeleznik, NDSU 扩展)
管理和其他重要事实
- This abiotic disorder is caused by an iron deficiency that is associated with alkaline soils, 凉爽的温度, and wet soils; these conditions render the normally abundant iron in North Dakota soils as unusable by the plant
- Foliar sprays of chelated iron may provide quick green-up of the foliage but this treatment is temporary and trees do not always respond
- Iron chelate products may be applied to the soil or injected into trees for longer lasting relief
- Broadcasting soil acidifiers such as elemental sulfur or iron sulfate onto the soil surface may lower the soil pH; gradually converting the iron in the soil into a usable form by the plant
- Replace iron-deficient trees with individuals that are better adapted to alkaline soils
作者:埃斯特·麦金尼斯和卡西亚·金泽