PEST MANAGEMENT DECISION GUIDE: GREEN AND YELLOW LIST
Sclerotium rot on vanilla
Anthelia Rolfisii (syn. Sclerotium rolfsii var.rolfsii) Collar rot
- Establish plantation in fertile, well draining soils using recommended spacing of 10ft by 5ft for optimum growth
- Select healthy disease free vines, put in a shade for 2 weeks to wither and heal wounds before planting
- Apply well decomposed manure or mulch placed away from stem base to protect roots and increase crop health
- Trim shade trees to maximum of 20 looped vines for optimum air flow and increased light penetration
- Keep orchard weed free by mulching, slashing and hand-weed around the plant base. Avoid damaging roots/stem base that would create fungus entry points
- Avoid excessive mulching during rainy season. And mulch with materials that are easily decomposed
- Avoid excessive manuring and use of fresh cow dung
- Phytosanitation through removal of diseased plant parts is important for effective functioning of fungal biocontrol agents and other beneficial microorganisms
- Inspect plantations once a week during rainy season and once in 2 weeks during dry season
- Look out for rots at the vanilla plant base and on pods.
- Look out for yellowing, gradual withering and rotting of the vanilla plant at the base
- At advanced stages, rotting spots have cottony whitish growth usually at the stem base
- Look out for whitish cottony growth on the shoot tips and pods
- Apply chemical control measures once 20%-30% of mature plants begin to wilt/rot
- Apply green direct controls when the disease coverage is less than 20% of the garden
- Prune, collect and burn diseased vines to reduce inoculum sources
- Use bleach to disinfect tools during pruning to minimize disease spread
- Reduce mulch where its excessive
- Use Trichoderma harzianum based products
- Spray on leaves and around the root zone, with a spray interval of 15 days. For the above foliar direct controls, spray once in a month during dry period and twice a month during the wet season to protect your crop and prevent further spread of the fungus.
- When using a pesticide or botanical, always wear protective clothing. WHO toxicity Class II products may not be allowed in local IPM schemes. Do not empty pesticides into drainage or water sources
- Always refer to the recent updated Pesticide list by the Department of Crop Protection, MAAIF, Uganda
- Read the product label and follow the dosage/application rates or consult a Plant Doctor (Agric. Officer) nearest to you.
- Never apply a fungicide and a biocontrol agent simultaneously. Apply one 15 days after applying the other
WHO class II (Moderately hazardous). Toxic to fish/aquatic organisms. Maximum number of treatment is four applications per year. PHI14 days. REI: 12 hours. FRAC 3DMI11. Systemic. Possibility of resistance.
Soil drench and spray the plants with 0.2% Copper oxychloride at 2-3 litres per plant
WHO class U (unlikely to present hazardous effects in normal use)
Spray with carbendazim (e.g. Bavistan)
WHO class III (slightly hazardous)
CREATED/UPDATED: May 2017/November 2019/ September 2020
PRODUCED BY: Plantwise
©CAB International. Published under a CC-BY-SA 4.0 licence.