A network that helps people worldwide obtain rapid advice and information on crop protection, including the identification and management of plant pests.
PestNet is a network that helps people worldwide obtain rapid advice and information on crop protection, including the identification and management of plant pests. It started in 1999. Anyone with an interest in plant protection is welcome to join. PestNet is free and is moderated, ensuring that messages are confined to plant protection.
In the picture, there is also a larva that is probably Scymnus sp. or Cryptogonus sp. It is an effective predator of the aphid and could be mass reared for biological control.
In Thailand, there is no BBTV, it was erroneously reported. However, Pentalonia nigronervosa is present. An exploration of its natural enemies by Hawaian entomologist with Thai entomologists in 2002 resulted in the introduction of Scymnus pleikuensis, S quadrillum and Cryptogonus lepidus to Hawaii for trial in biological control of this banana aphid.
Pentalonia nigronervosa is almost always closely attended by ants, which defend the aphids from predators and parasites, and spread the aphids to other feeding sites. Control of ants in the plantation should greatly reduce the aphid problem.
Use of pesticides would only be effective against a small proportion of the aphid population, as P nigronervosa lives mainly underneath layers of leaves on the pseudostem where contact insecticides will not reach the insects. Contact insecticide would kill any predators and parasites present and might make the aphid problem worse. The most effective long-term management method is biological control. (Editor: for control BBTV, the usual method is regular scouting to identify infected bananas and then careful removal using a combination of herbicide and insecticide to kill the diseased banana and also prevent the aphids with virus from spreading the disease).