Plantwise Factsheets for Farmers
Tolerant bean varieties against stem maggots
Recognize the problem
stem maggot, also called bean fly, is a small shiny fly. It is only 2mm long and
has transparent wings. The larvae, which are small and yellowish, can be seen by
opening the stem. They attack susceptible bean varieties and late-planted
beans. Most of the time, the pest lives inside the bean plant.
Bean stem maggots
are often a problem in the main growing areas of beans, e.g. Northern
Province of Zambia, and in provinces where bean growing is promoted.
varieties are attacked less than others. Stem or leaf sheaths of some
varieties cannot be punctured by the fly for egg laying, because they are
hard and rough. Therefore, it is not easy for the fly to lay eggs and so no
larvae can develop to damage the beans.
Maggot-tolerant varieties include Lukupa and Chambeshi, which can be
ordered from an agro-input dealer or seed company
agronomical practices for these varieties are the same as for other varieties
- Plant them at 20 cm by 5cm in a field that has been well ploughed
- Make sure you plant around mid-January
- Apply basal dressing of 10-20-10 NPK
fertilizer, e.g. D Compound, at 200kg/ha during or before planting but no
later than two weeks after germination
- Thereafter, when the crop has established,
apply top dressing ammonium nitrate fertilizer 100kg/ha
- A healthy strong plant can tolerate pests better
than weak plants
The recommendations in this factsheet are relevant to:
Plantwise Factsheets Library app
Get all of the factsheets and pest management decision guides from this website in an offline format via the Plantwise Factsheets Library app.