European cranberry bush (V. opulus) and snowball (V. opulus var. sterilis) viburnums -- two of the most widely grown varieties -- are highly susceptible to leaf curl aphid infestations. Adult snowball ...

These move upward on the plant as populations increase. Figure 1: Bird-cherry oat aphids on a corn leaf. Note the dark color and red coloration around the cornicles. English grain aphids (Figure 2) ...

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These aphids move to serviceberry shrubs in early summer. In early fall they fly back to elm to spend the winter. They do not cause major damage to mature trees and shrubs. They can be damaging when ...

The good news, though, is that unless you raise seed corn or are in a special situation, aphids likely won’t cause economic damage. Here is what Nick Seiter, Extension field crops specialist at the ...

Aphids secrete honeydew, a mixture of excess water and sugars, that sticks to the leaves and fruit, enabling black sooty mold to develop wherever the honeydew is deposited. These insects also may ...

The soybean aphid feeds using sucking, needle-like mouthparts to extract plant juices. If aphids are present in large numbers, this feeding may cause a reduction in plant vigor and growth rates, as ...

Aphids are soft-bodied insects that feed on the sap of plants, which weakens their growth and leads to issues like wilting, ...

Record the total number of aphids and calculate the average per stem. Look for symptoms of damage, including leaf discolouration in host plants. Severe infestation may appear as large, bronzy or brown ...

They spend the remainder of the summer on the alternate host before flying back to the trees in the fall to lay eggs that spend the winter. These aphids may cause some leaf drop and certainly are ...