Other Common Names
Bean Aphid, Beet Leaf Aphid
Wingless adults 1.8 to 3.1 mm.
Body of wingless females ovoid, green-brown or black with wax pollination and big marginal tubercles on prothorax and on abdominal segments I and VII. Legs and antenna light yellow. Cornicles 2 times as long as the fingerlike tail; tarsi brown-black. Antennae two thirds as long as body. Head and thorax of winged female are black and shiny, and abdomen is black-green.
native to Europe, introduced to NA in late 1860s(1)
Primary (winter) hosts: Euonymus and Viburnum. Secondary (summer) hosts: sugar beet, beans, haricot beans, potatoes, sunflower, tomato and other cultivated and wild plants. It has been recorded on almost 300 plant species.
Overwinters as eggs in the primary host. In the spring, after several generations of wingless forms (produced parthenogenetically), winged forms are produced that migrate to the secondary host. There are several wingless generations, then winged forms migrate back to primary host in the fall where males and females are produced and eggs are laid.
Some regard it as a group of related species or biotypes. (2)
They can be a serious pest of many types of vegetables, specially beans and sugar beets.
Natural enemies (lady beetle larvae and adults, lacewing larvae and adults, hover fly larvae, parasitic wasps)
But Smith (1965) found 9 out of 10 spp. of coccinellids including the polyphagous Col. maculata failed to complete their larval development when fed on Aphis fabae...
Banks, C.J. 1955. An ecological study of Coccinellidae associated with Aphis fabae Scop. on Vicia faba. Bulletin of Entomological Research 45: 561-587.
Smith, B.C. 1965. Growth and development of coccinellid larvae on dry foods (Coleoptera, Coccinellidae). Can. Entomol. 97: 760–768