MAPIPlant Pests & Diseases
Explainers
Garden & Outdoor
Why Are My Plant Leaves Covered in Black Sooty Mold?
Black soot-like coating on leaves is often sooty mold growing on sticky honeydew produced by sap-feeding insects such as aphids, whiteflies, mealybugs or soft scale.
Garden & Outdoor
What Are the Brown Bumps on My Plant Stems?
Brown or tan bumps that stay attached to stems or leaves may be scale insects, especially when the plant also has sticky honeydew, sooty mold, yellowing or reduced vigor.
Garden & Outdoor
Why Are There Cottony White Clumps on My Plant?
Cottony white clumps on stems, leaf joints or leaves often indicate mealybugs, insects covered in white wax that feed on plant sap.
Garden & Outdoor
Why Are There Tiny White Flies on My Plant?
Tiny white insects that flutter up when a plant is disturbed are a classic sign of whiteflies, especially when the leaf undersides hold flat immature stages.
Garden & Outdoor
Why Are There Tiny Webs on My Plant Leaves?
Tiny webbing on leaves is a strong clue for spider mites, especially when leaves are also stippled, bronzed or dropping.