Barley Barley Crop Icon Brassicas Brassicas Crop Icon Sugar Beet Sugar Beet Carrots Carrots Icon Leeks Leek Icon Maize Maize Icon Oilseed Oilseed Icon Onions Onions Icon Other Cereals Other Cereals Icon O R T Peas And Beans Peas and beans Icon Potatoes Potatoes Icon Salad Crops Salad Crops Icon Soft Fruits Crops Soft Fruits Icon Top Fruits Crops Top Fruits Icon Wheat Crops Wheat Icon Calendar Calendar icon Arrow Next Arrow Previous Close Checkmark

Black Bean Aphid

1. Aphis fabae

Identification

Black or dark olive green, 1.5-3mm long.

Symptoms

A major pest of both sugar beet and beans causing damage by direct feeding. In beans plants lose vigour and flowers and pods are affected resulting in poor pod development and loss of yield. Black bean aphid colonies are very conspicuous on individual plant stems and leaves.

Life-cycle

The overwintering plant host is spindle (Euonymus europaeus). Eggs hatch in early spring and colonies form on young leaves and shoots. Winged forms appear in May and June and in suitable weather conditions these migrate to a wide range of summer hosts and have been recorded on over 300 plant species. In warm conditions colonies can build-up rapidly and when over-population causes crowding, winged forms are produced to widen distribution.

Importance

Spring beans are more at risk than winter beans as flowering coincides with aphid migration. The black bean aphid can transmit more than 30 viruses.

Threshold

Varies from 2.5-10 % plants infested depending on crop growth stage.

 

Identify Pests

Find out more information and help identify the pests found on your crops.

View now