Kenya such as Machakos, Makindu and Kajiado where it causes yield losses of between 50 to 100 per cent according to the Kenya Agricultural and Livestock Research Organization.
The leaves of damaged plants show mining tracks where the maggots feed. The lower parts of the stems become dry, swollen and cracked. Attack by this pest often causes death of young bean plants.
According to a research by the Kenya Agricultural and Livestock Research Organization, the pest can be controlled by planting early before the rains start. Apply farmyard manure at planting by putting one handful in each planting hole. This makes the plant strong and able to recover from damage. Read more