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The whitish-green aphids are about 2–4 millimetres (3 ⁄ 32 – 5 ⁄ 32 inch) long and form dense colonies on hellebores, coating them with a honeydew that can lead to the growth of sooty mold on the leaves and flowers of the hellebore. This species of aphid only affects hellebores and is most active in March and April when the hellebores ...
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Veratrum album, the false helleborine, white hellebore, European white hellebore, or white veratrum (syn. Veratrum lobelianum Bernh. ) [ 1 ] is a poisonous plant in the family Melanthiaceae . It is native to Europe and parts of western Asia (western Siberia , Turkey , Caucasus ).
Veratrum viride, known as Indian poke, corn-lily, Indian hellebore, false hellebore, green false hellebore, [2] or giant false-helleborine, [3] is a species of Veratrum native to eastern and western (but not central) North America. [4] [2] [5] It is extremely toxic, and is considered a pest plant by farmers with livestock.
After the beet yellows virus carried by aphids reduced the French harvest by 30% in 2020, and farmers and sugar makers lobbied the government, France suspended a European Union ban on ...
Aphids can also transmit viruses and allow sooty mold to take hold. When the population becomes too large, an aphid might grow wings and fly away to find a fresh host plant.