yellow, die and drop off. Severe air circulation. infections result in sunburned Crop monitoring. Early disease detection is fruits and weakened plants. important for successful powdery mildew Infected plants have lower yield control. and a shortened fruiting season. Sanitation: Conduct a thorough year-end High relative humidity and warm, and dispose of all crop debris off-site or by shady weather favors disease burying in a landfill or composting. development. Cercospora leaf spot, A fungal disease transmitted by Use resistant and tolerant varieties. No treatment threshold (=Cercospora) wind, rain and irrigation water is Use clean seed. Pseudocercospora characterized by tiny circular or Avoid overhead watering. mancozeb abelmoschi oval spots on leaves that enlarge Water early in the morning. tebuconazole + with time. It is also seed-borne. Crop rotation for 2-3 years with sorghum, trifloxystrobin Dark green or brown round spots maize, or fodder plants. surrounded by a yellow ring form Remove and destroy crop residues and heavily on young plants, but turn white on infected plants. older crop. Leaves turn yellow then wilt and fall. Elongated spots form on stems. The disease is favored by dew, rain and high humidity. Viruses: Symptoms include leaf puckering, Use resistant varieties. No treatment threshold mottling discoloration, and Use clean and treated seed. Potato Leaf Roll Virus (PLRV), dwarfing. Aphids transmit these To control vector aphids: Potato X Virus (PXV), Potato viruses. Under field conditions, Use seed treatments of Virus Y (PVY) there is often a composite imidacloprid infection with the three viruses (PLRV; PVX; PVY) on potato. pymetrozine PLRV also infects other solanaceous crops and weeds. The virus spreads early in the season, as young plants are generally more susceptible. Plants that are infected early become more efficient sources for further virus spread than plants infected later in
yellow, die and drop off. Severe infections result in sunburned fruits and weakened plants. Infected plants have lower yield and a shortened fruiting season. High relative humidity and warm, shady weather favors disease development. air circulation. Crop monitoring. Early disease detection is important for successful powdery mildew control. Sanitation: Conduct a thorough year-end and dispose of all crop debris off-site or by burying in a landfill or composting. Cercospora leaf spot, Pseudocercospora (=Cercospora) abelmoschi A fungal disease transmitted by wind, rain and irrigation water is characterized by tiny circular or oval spots on leaves that enlarge with time. It is also seed-borne. Dark green or brown round spots surrounded by a yellow ring form on young plants, but turn white on older crop. Leaves turn yellow then wilt and fall. Elongated spots form on stems. The disease is favored by dew, rain and high humidity. Use resistant and tolerant varieties. Use clean seed. Avoid overhead watering. Water early in the morning. Crop rotation for 2-3 years with sorghum, maize, or fodder plants. Remove and destroy crop residues and heavily infected plants. No treatment threshold mancozeb tebuconazole + trifloxystrobin Viruses: Potato Leaf Roll Virus (PLRV), Potato X Virus (PXV), Potato Virus Y (PVY) Symptoms include leaf puckering, mottling discoloration, and dwarfing. Aphids transmit these viruses. Under field conditions, there is often a composite infection with the three viruses (PLRV; PVX; PVY) on potato. PLRV also infects other solanaceous crops and weeds. The virus spreads early in the season, as young plants are generally more susceptible. Plants that are infected early become more efficient sources for further virus spread than plants infected later in Use resistant varieties. Use clean and treated seed. No treatment threshold To control vector aphids: Use seed treatments of imidacloprid pymetrozine
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