Name two common micronutrient deficiency symptoms in trees.

Name two common micronutrient deficiency symptoms in trees.

• A. Iron chlorosis and magnesium deficiency
• B. Nitrogen deficiency and phosphorus deficiency
• C. Drought stress and root rot
• D. Powdery mildew and leaf scorch

Answer: (A)

When diagnosing nutrient problems in trees, you look for specific leaf symptoms that point to particular nutrients. Iron deficiency is a classic micronutrient issue and shows up as chlorosis—yellowing between the leaf veins—in young leaves, especially on soils with high pH where iron becomes less available. Magnesium deficiency is another common pattern that can appear as interveinal chlorosis in older leaves, with the areas between the veins turning yellow while the veins stay green. These two patterns are among the most frequently observed micronutrient deficiency symptoms in trees, which is why they’re considered a typical pair. Context to keep in mind: iron tends to affect new growth first and is strongly influenced by soil pH, while magnesium tends to show in older leaves and can be influenced by soil calcium levels and pH as well. If you suspect a deficiency, confirm with a soil or tissue test and consider correcting soil pH or adding appropriate chelated iron or magnesium amendments as needed. The other options describe drought stress, root rot, powdery mildew, or leaf scorch—conditions driven by water stress, pathogens, or heat—rather than nutrient deficiency symptoms.

When diagnosing nutrient problems in trees, you look for specific leaf symptoms that point to particular nutrients. Iron deficiency is a classic micronutrient issue and shows up as chlorosis—yellowing between the leaf veins—in young leaves, especially on soils with high pH where iron becomes less available. Magnesium deficiency is another common pattern that can appear as interveinal chlorosis in older leaves, with the areas between the veins turning yellow while the veins stay green. These two patterns are among the most frequently observed micronutrient deficiency symptoms in trees, which is why they’re considered a typical pair.

Context to keep in mind: iron tends to affect new growth first and is strongly influenced by soil pH, while magnesium tends to show in older leaves and can be influenced by soil calcium levels and pH as well. If you suspect a deficiency, confirm with a soil or tissue test and consider correcting soil pH or adding appropriate chelated iron or magnesium amendments as needed.

The other options describe drought stress, root rot, powdery mildew, or leaf scorch—conditions driven by water stress, pathogens, or heat—rather than nutrient deficiency symptoms.