LOSE LESS, FEED MORE Plantwise is a CABI-led global initiative. www.plantwise.org PEST MANAGEMENT DECISION GUIDE: GREEN AND YELLOW LIST Bean stem maggot / bean fly Ophiomyia spp.; local name: Funza wa inzi wa maharage (Swahili) ___. (Photo: Willis Ochilo) Prevention Monitoring Direct Control Direct Control Restrictions Use resistant varieties Mwezi moja Early planting: plant at the onset of rains (bean fly numbers tend to be low during the early stages of growing season and increase with time) Use of mulch (e.g. rice straw or cut grasses) and earthing up the soil around the stem base which enhances adventitious root formation and recovery tolerance to damage Uproot volunteer crops to break the BSM cycle Avoid overlapping bean crop especially when there is enough rain Seed dressing (see direct control column) Avoid planting beans near alternative host plants such as cowpea, soybean and other leguminous crops Field sanitation such as removing crop residues Assess after germination (2-3 weeks) Inspect the leaves and the stem base for symptoms Look for oviposition marks on the leaves; swelling and cracking; larvae and pupae in the stem base (root collar) Institute control measures when 5- 10% of the plant population has been infested. Use botanical insecticides such as neem (100 g of dried leaves in 1 litre warm water (30°C) and kept for 12 hours. Filter and spray) Uproot infested plants from the field and destroy by burning. Diazinon Moderately hazardous (WHO II) Mode of action: Organophosphate Acephate WHO II Mode of action: Organophosphate Imidacloprid WHO II Mode of action: Neonicotinoid Apply as seed dressing General Wear protective clothing when handling chemicals Follow instruction on the product label such as dosage, pre-harvest interval and appropriate time of application Kenya CREATED: July 2013 AU THORS: Nancy Murage (Ministry of Agriculture – District Crops Development Officer), Dora Kilalo Dr. (Nairobi University), Alfayo Ombuya (KEPHIS), Miriam Otipa (KARI), Willis Ochilo (CABI) EDITED BY: Melanie Bateman (CABI) and Erica Chernoh (CABI)
