Top Ten Abiotic Diseases PDF
Preview Top Ten Abiotic Diseases
TToopp 1100 AAbbiioottiicc DDiissoorrddeerrss --WWooooddyy OOrrnnaammeennttaallss-- JayDee Gunnell Horticulture Agent – Davis County Utah State University PPllaanntt DDiisseeaasseess Disease – anything that affects the normall ffunction off thhe pllant. • Biotic – caused by living organisms • Bacteria • VViirruusseess • Fungi • Nematodes •• AAbbiioottiicc – ccaauusseedd bbyy nnoonn-lliivviinngg ssttrreesssseess • Environmental / temperature extremes • Soil properties / pH •• CChheemmiiccaall ddaammaaggee // ssaalltt iinnjjuurryy • Mechanical damage FFiieelldd OObbsseerrvvaattiioonn • Ask a lot of questions •• PPaayy aatttteennttiioonn ttoo eennvviirroonnmmeennttaall qquueeuueess • Take note of site history. – Biotic Diseases – Usually are scattered or randomly distributed. – Abiotic Disorders – Typically appear in patterns or display uniformity 33 SStteps iin DDiiagnosiing DDiiseases… 1- Know the plant affected. 2- Know the reported diseases. 3- Know that it can be difficult. UUSSUU EExxtteennssiioonn - HHeellppss • Utah Plant Pest Diagnostic Lab (UPPDL) •LLocatedd on LLogan campus • Sample submission is only $5.00 •Insect pest identification •Plant diseases identification hhttttp:////uuttahhpestts.uusuu.edduu TToopp 1100 AAbbiioottiicc DDiissoorrddeerrss • Iron chhllorosis • Excessive irrigation • Plantingg deppth • Summer scorch • Girdling roots • Herbicide damage • MMechhaniicall ddamage • WWiinter ddamage • Packaging material • Salt damage Iron Chlorosis SSymptoms: - interveinal yellow leaf tissue - veins remain green - occurs on current seasons growth - marginal burning Causes: - alkaline soils - soil compaction - saturated soils Remedies: - Avoid sensitive plant species - AAeerraattee ccoommppaacctteedd ssooiillss - Avoid water-saturated soil conditions - Apply chelated iron (FeEDDHA) in early sppringg before ggrowth beggins Planting Depth Symptoms: - slow growth rate - thinningg tree canoppyy - early dieback - lack of visible root flare - trunk decayy Causes: - re-potted nursery stock - ddeepptthh ooff ppllaannttiinngg hhoollee – ttoooo ddeeeepp - buried root flare on B&B trees Remedies: - Select high quality nursery stock - Examine planting depth before purchase - Look for voids around the tree trunk in container - Plant root flare at final soil grade Circling / Girdling Roots SSymptoms: - overlapping roots visible - progressive thinning of tree canopy - bbranchh ddie-bbackk - early tree death Causes: - root circling induced by containers - width of planting hole too narrow - root bound nursery stock RRemeddiies: - Purchase healthy nursery stock • not root-bound • less than 2 years in original container - Dig planting hole 2-3 times wider than root ball
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