Crop Diagnostic Report, Issue #1, July 27, 2018
| Visual Symptom | Symptoms to Look For | Diagnosis |
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Firing -yellow and brown on outside margins of lower leavesiring -yellow and brown on outside margins of lower leaves
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Potassium deficiency in corn. For more information see Potassium Deficiency in Corn for full PDF Report (319 KB)
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Burning of leaf tissue | Post-Anthesis Nitrogen in Wheat. or more information see PAN in Wheat for Protein for full PDF Report (466 KB) |
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Poor growth, no nodules | Soybean Nodulation issues due to acidic soils and dry soils. For more information see Checking for Soybean Nodulation and Intervention for full PDF report (700 KB) |
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Impressive vegetative topgrowth, but no nodules on roots | High residual soil nitrogen. For more information see Checking for Soybean Nodulation and Intervention for full PDF report (700 KB) |
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Bronzing of leaves after herbicide application | Surfactant burn from surfactant in glyphosinate herbicide occurs when high humidity and brilliant sun at time of application |
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Oat | Bacterial oat blight is favoured by moisture weather and dews. There is no fungicidal control |
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Peas drying up, prematurely dying | Poor growth and premature ripening along with decaying roots are symptoms of root rots. Aphamomyces spp. is most destructive root rot pathogen and can infect singly or in colaboration with Fusarium, Pythium and Rhizoctonia. To determine the species, submit samples to the Crop Diagnostic Lab |
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Soybean plants stunted, chlorotic, dying | Random, patchy chlortic and stunted plants are consistent with root rot symptoms. Several species of Fusarium, Pythium, Phytopthora and Rhizoctonia can be the cause. To determine the species, submit samples to the Crop Diagnostic Lab |
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Spruce trees needles turning brown and dying | Needle cast fungi shows irregular tan, yellow, red-orange, reddish brown or black spots, specks or bands on previous seasons growth. Affected needles drop early. To prevent spreading, the new needles should be protected by applying a copper fungicide containing copper oxychloride just as growth begins in spring. There are currently no fungicides available for home use. Consult an arborist or tree care service for fungicide options. |
