Bean fly, Ophiomyia phaseoli is a shiny, metallic black fly 2 mm in length, with a wing span of 5 mm. Eggs are laid on the upper or lower surface of leaves. Maggots tunnel through leaf tissue (silvery mines), to the petiole, branch and/or upper part of the stem, and then down to the root. Affected plants may exhibit wilting, stunting, cracked or swollen stems, and death. Important in tropical Africa and Asia.
- Presence of previously infested crop debris
- Lack of crop rotation
- Poor sanitation of previous legume and weed debris
- Contaminated seed
- Susceptible varieties
- Moderate to high moisture conditions favor slugs
Courtesy of F. B. Peairs-CSU, K.K.Mauna-Asiatic Agr. Ind., and M. Sheppard et al. –SE Asia [Bugwood.org](09/2011)