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Summary: Corn is more often deficient in zinc than in other micronutrients, and is responsive to zinc application when deficient. Zinc may be deficient in sandy soils, other low-organic soils such as those with topsoil removed or soils with high pH. Seedlings may show deficiencies during cool, wet weather. Fields with zinc deficiency are seldom affected uniformly. Zinc deficiency symptoms may also vary from [...]
Magnesium, an Essential Plant Nutrient Mobile within the plant Critical for several functions: Central element in the chlorophyll molecule Transport of phosphorus Enzyme activation Nutrient uptake functions Oil and fat production Translocation of starch Magnesium Deficiency Symptoms Often confused with other nutrient inadequacies May be positively identified by: Visual and physiological symptoms Soil chemical analysis Plant mineral (tissue) analysis Visual and Physiological Symptoms: Interveinal chlorosis (yellow [...]
Phsoderma maydes Healthy Leaf: Healthy leaves shine with a rich dark green color when adequately fed. Phosphate Shortage: Phosphate shortage marks leaves with reddish-purple, particularly on young plants. Potash Deficiency: Potash deficiency appears as a firing or drying along the tips and edges of lowest leaves. Nitrogen Hunger: Nitrogen hunger sign is yellowing that starts at the tip and moves along middle of leaf. Magnesium Deficiency: Magnesium deficiency causes [...]
Physoderma Maydis Symptoms: Physoderma brown spot lesions occur mainly on the leaf, but may also occur on leaf sheath, stalks, outer ear husks and tassels As disease progresses, small lesions may coalesce to form larger affected areas Look-Alike Diseases: Eyespot disease caused by Aureobasidium zeae can look similar to Physoderma brown spot Eyespot is a leaf disease with small, yellow, mostly round lesions Main difference – lesions of [...]
Symptoms of Diplodia Stalk Rot Symptom: Diplodia stalk rot may first be evident when affected plants die suddenly during mid- to late-ear fill. Upon examination, dark brown lesions can be found extending in either direction from the node. Small black spots (pycnidia) may develop just beneath the stalk epidermis near the nodes. The black dots are not easily removed, which distinguishes Diplodia from Gibberella. [...]
