PEST MANAGEMENT DECISION GUIDE: GREEN AND YELLOW LIST
Passion fruit woodiness disease in passion fruit
Passion fruit woodiness virus passion fruit woodiness disease, Kigenge in Luganda language
- Passion fruit woodiness disease is caused by a virus called potyvirus. The virus is transmitted by at least 2 species of aphids; Myzus persicae (light green) and Aphis gossypii (black) as well as by pruning tools
- Plant certified disease-free seedlings
- Avoid intercropping passion fruit with tomatoes, cucurbits and cowpeas as these are hosts of the virus.
- Avoid weeds as these can be alternative hosts to the aphids
- Control aphids at all crop stages as they transmit the virus
- Passion fruit commonly become infected and show symptoms six months from planting 7, monitor every 14 days for aphids to avoid transmission to uninfected plants
- Virus symptoms on leaves: Yellow light green mosaic appearance and mottling with dark green areas on raised spots
- Misshapen and/or small fruits as well as leaves
- Lack of growth of terminal shoot leading to bunchiness with harsh terminal leaves
- Look out for aphids undersides of leaves because these spread the disease through feeding. Aphids are tiny(1/4inch) light green, grey and may have waxy or woolly coating.
- Leaves are sometimes covered with honey dew and sooty moulds causing the leaves and branches to appear black
- On fruit: distortion, abnormal thickening, hardening of rinds caused by virus
- Initiate control measures for aphids on noting 1 to 4 colonies of aphids per 10 plants or 10% infection of field, but only in case the virus is present in the area
- When there are no virus symptoms known from the neighbourhood, then aphids do not need to be controlled.
- When the virus is in the plants, and plants show virus symptoms, action is too late
- Control aphids as these transfer the disease while feeding. Spray soapy water underside leaves, in morning or evening when sun is not hot (mix 2L water and 1 tsp liquid soap) and apply for 2-3 days for every 2 weeks until lower than threshold
- Sterilise the pruning tools before and after use in a 1:5 ratio bleach or over a fire to not spread the disease
- Plants showing typical virus symptoms should be uprooted and burnt to prevent further spread.
- No chemical control is effective for this virus disease
- Only the virus-vectoring aphids may be controlled if threshold is reached and the virus known from the area
- When using a pesticide or botanical, always wear protective clothing and follow the instructions on the product label, such as dosage, timing of application, pre-harvest interval, max number of sprays, restricted re-entry interval.
- Always consult recent list of registered pesticides with MAAIF,Uganda
Spray Lambda cyhalothrin, Pyrethroid with contact and stomach action, Usually at 1ml/L water but check label.
14 days interval
WHO toxicity class II (moderately acute hazardous to humans). Re-entry Interval REI 12 hours; Pre-harvest interval PHI:7 days
Harmful to bees and pollinators, so do not spray during flowering. Max 2 sprays /season
Imidacloprid. A neonicotinoid, with systemic activity. Check label for dosage
WHO II (moderately hazardous to humans). PHI: 14 days, REI: 24 hours. Toxic to bees and other pollinators10, so spray after sunset, crop not flowering. Moderately toxic to soil and water organisms, so do not use near waterways10
CREATED/UPDATED: June 2020
PRODUCED BY: Plantwise
©CAB International. Published under a CC-BY-SA 4.0 licence.