Main aphids in Africa: Black bean aphid ([i]Aphis fabae[/i]), Cabbage aphid ([i]Brevycoryne brassicae/Myzus persicae[/i]), Groundnut aphid ([i]A.craccivora[/i]), Cotton aphid ([i]A.gossypii[/i]), Russian wheat aphid ([i]Diuraphis noxia[/i]), Cypress aphid ([i]Cinara cupressi[/i])
Aphids, mainly the legume aphid (Aphis craccivora) (also called groundnut aphid) are relative small. Immatures are slightly dusted with wax, adults without wax. Apterae are 1.4 to 2.2 mm long. Alatae (winged form) 1.4 to 2.1 mm. They feed on young plants, leaflets, stem and pods of green gram. Attacked young leaves become twisted. Excretion of honeydew leads to growth of sooty mould. Aphids are also vectors of virus diseases.
- Plant early.
- Cultivate thorough to ensure weed-free plots. .
- Avoid excess use of nitrogen.
- Conserve natural enemies.