Aphids are small, soft-bodied insects with long, slender mouth parts that they use to pierce stems, leaves, and other tender plant parts and suck out plant fluids. Low to moderate numbers of aphids are usually not damaging in gardens or on trees, but large populations can cause curling, yellowing, and distortion of leaves and stunting of shoots; they can also produce large quantities honeydew, which often turns black with the growth of a sooty mold fungus.
Free publication that you can access as an HTML web page or download as a PDF document.
The PDF version of this publication requires the free Adobe® Acrobat® Reader. You can download a free copy of the Acrobat Reader from Adobe Systems Incorporated.