Why does your Brassica napus have sticky leaves? Diagnose the cause and fix it with our step-by-step guide.
Aphids feed on the phloem of Brassica napus, excreting 'honeydew,' a sticky, sugar-rich substance that coats the leaves. This often leads to secondary issues like sooty mold growth on the leaf surface.
While caterpillars primarily consume leaf tissue, their feeding activity can disrupt plant fluids and leave behind sticky frass or saliva residue on the remaining foliage.
While not a primary cause, a dark, sticky coating often appears when other pests have left honeydew behind. The mold itself is a fungus that grows on the sugary residue produced by insects.
Scale insects attach themselves to the stems and leaves of canola, sucking sap and secreting honeydew that creates a tacky residue on the plant surfaces.
Your plant might also be experiencing one of these issues:
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