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AIFST Fresh Produce Food Safety Summit
Aphids & Viruses
Broccoli Export Seminar
Carabid beetles as sustainability indicators
Clubroot - Nursery Access
Clubroot - Nursery Cleaning
Clubroot - Nursery Contamination
Clubroot - Nursery Design
Clubroot - Nursery Monitoring
Clubroot - Nursery Response
Clubroot - Nursery Sources
Hangzhou Foods
IPM - approach to Potato crops
IPM - approach to practice change
IPM - Potato/Tomato Psyllid
Lettuce Anthracnose Management
Native Plants - Food Safety
Native Plants - Food Standards
NY9406 Downy Mildew on seedlings - factsheet
NY9406 Downy Mildew on seedlings - report
NY9406 Downy Mildew on seedlings - review
NY97011 Downy Mildew on seedlings - extension
NY97011 Downy Mildew on seedlings - notes
Parsley Disease Handbook
Parsnip Variety Trials
Phytochemical composition of food
Phytochemicals and Healthy Foods
Reclaimed water - risk model
Reclaimed water use in Victoria
Recycled Water Quality - Lettuce
Sclerotina - Lettuce Conference 2002
Strategies for Control of Root Rot in Apiaceae Crops
Summer Root Rot in Parsley
Thrips & Viruses
Tobamoviruses
Vegetable Disease Program
Vegetable Diseases in Australia
Vegetables Viruses
VG00013 Leek Diseases
VG00016 Environmental Performance
VG00026 IPM Eggplant & Cucumber
VG00031 Peas - downy mildew & collar rot
VG00031 Peas - Downy Mildew - metalaxyl resistance
VG00034 Capsicum & Chillies - weed control
VG00044 Clubroot - Applicator design
VG00044 Clubroot - Chemical control
VG00044 Clubroot - Implementing a control strategy
VG00044 Clubroot - Managing outbreaks
VG00044 Clubroot - Nutritional amendments
VG00044 Clubroot - Strategic application
VG00044 Clubroot – Introduction
VG00044 Clubroot – Limes and liming
VG00044 Clubroot – Prevention & Hygiene
VG00044 Clubroot – Understanding Risk
VG00044 Total Clubroot Management
VG00048 Alternate fungicides for sclerotinia control
VG00048 Brassica green manure conference paper 2004
VG00048 Brassica Green Manure Update 16
VG00048 Brassica Green Manure Update 18
VG00048 Diallyl Disulphide - DADS - trials
VG00048 Lettuce - Sclerotinia biocontrol
VG00048 Lettuce Sclerotina - Biocontrols
VG00058 Pea - Collar Rot
VG00069 Cucumber & Capsicum diseases
VG00084 Beetroot for Processing
VG01045 Bunching Vegetables - disease control
VG01049 Compost - Benefits
VG01049 Compost - Choosing a Supplier
VG01049 Compost - Getting Started
VG01049 Compost - Introduction
VG01049 Compost - Safe Use
VG01049 Safe Use of Poultry Litter
VG01082 Broccoli Adjuvant Poster
VG01082 Broccoli Head Rot
VG01096 Article - White Rot research
VG01096 Integrated Control of Onion White Rot
VG01096 Poster - Alternative fungicides
VG01096 Poster - Diallyl Disulphide - DADS
VG01096 Poster - Trichoderma biocontrol
VG01096 Poster - Trichoderma optimisation
VG01096 White Rot - Spring Onions
VG02020 Capsicum - Sudden Wilt
VG02035 Capsicum - virus resistance
VG02105 Vegetable Seed Dressing Review
VG02118 White Blister
VG03003 Lettuce - Varnish Spot
VG03092 Lettuce - Shelf Life
VG03100 Retailing Vegetables - Broccolini®
VG04010 Maximising returns from water
VG04012 Hydroponic lettuce - root rot
VG04013 Brassica White Blister
VG04013 White Blister - Control Strategies
VG04013 White Blister - Race ID
VG04013 White Blister - Risk Forecasting
VG04013 White Blister - Symptoms
VG04013 White Blister - Workshop Notes
VG04014 Better Brassica
VG04014 better brassica - roadshow model
VG04014 better brassica - workshop notes
VG04014 Clubroot Guidebook
VG04014 Clubroot Poster
VG04015 Benchmarking water use
VG04016 Celery leaf blight - Poster
VG04016 Celery Septoria
VG04019 Nitrate & Nitrite in Leafy Veg
VG04021 Vegetable Seed Treatment
VG04025 Parsley Root Rot
VG04059 Diagnostic test kits
VG04061 White Blister - alternative controls
VG04061 White Blister - Workshop 2007
VG04062 Beetroot Study Tour
VG04067 IPM - Lettuce Aphid
VG05007 Onion White Rot - post plant fungicides
VG05008 IPM - Cultural Controls
VG05014 IPM - Native vegetation pt1
VG05044 IPM - Consultants Survey
VG05044 IPM - Grower Survey
VG05044 IPM - Lettuce Aphid Trials
VG05044 IPM - Lettuce Disease Poster
VG05044 IPM - Predatory Mites
VG05044 IPM - Project Summary
VG05045 Parsnip Canker
VG05051 Climate Change
VG05053 Rhubarb Viruses
VG05068 Baby Leaf Salad Crops
VG05073 Mechanical Harvesting
VG05090 Green Bean - Sclerotinia
VG05090 Rhizoctonia Groups
VG06014 Revegetation for thrip control
VG06024 IPM - Native vegetation pt2
VG06046 Parsley Root Rot
VG06047 Celery - Septoria Predictive Model
VG06066 LOTE Grower Communications
VG06086 IPM - Potential & Requirements
VG06087 IPM - Lettuce Aphid
VG06087 IPM - Toxicity testing
VG06088 IPM - Lettuce Aphid trials
VG06092 Pathogens - Gap Analysis
VG06092 Pathogens of Importance - poster
VG06140 Beetroot - colour quality
VG07010 Systemic aquired resistance
VG07015 Curcubit field guide
VG07070 Conference Notes 2008
VG07070 Foliar diseases
VG07070 Nitrogen & lettuce diseases
VG07070 Predicting Downy Mildew on Lettuce
VG07070 White Blister - Chinese Cabbage
VG07070 White Blister - Cultural Controls
VG07070 Workshop Notes - 2008
VG07070 Workshop Notes - 2010
VG07125 IPM - soilborne diseases
VG07126 Biofumigation oils for white rot
VG07126 New approaches to sclerotina
VG07127 White Blister - Alternative Controls
VG08020 Optimising water & nutrient use
VG08026 Pythium - field day
VG08026 Pythium - workshop 2010
VG08026 Pythium control strategies - overview
VG08107 - Carbon Footprint - workshop
VG08107 - Carbon Footprint part 1 - definitions
VG08107 - Carbon Footprint part 2 - issues
VG08107 - Carbon Footprint part 3 - calculators
VG08107 - Carbon Footprint part 4 - estimate
VG08107 - Carbon Footprint part 5 - users
VG08107 - Carbon Footprint part 6 - options
VG08426 Parsnip - Pythium Notes 2010
VG09086 Evaluation of Vegetable Washing
VG09159 Grower Study Tour- Spring Onions & Radish
VG96015 Carrot Crown Rot
VG96015 Carrot Defects - Poster
VG97042 Export - Burdock, Daikon and Shallots
VG97051 Pea - ascochyta rot
VG97064 Greenhouse Tomato and Capsicum
VG97084 Green Bean - white rot
VG97103 Celery Mosaic Virus
VG98011 Carrot - Cavity Spot
VG98048 Lettuce - Adapting to Change
VG98083 Lettuce - rots & browning
VG98085 GM Brassicas
VG98093 Microbial hazards - review
VG98093 Safe vegetable production
VG99005 Quality wash water
VG99008 Clubroot - rapid test
VG99016 Compost and Vegetable Production
VG99030 Globe Artichokes - value adding
VG99054 Onions - Theraputic Compounds
VG99057 Soil Health Indicators
VG99070 IPM - Celery
Victorian soil health
VN05010 Folicur - alternative carriers
VN05010 Onion White Rot - Fungicides
VN05010 Onion White Rot - summary
VX00012 Metalaxyl breakdown
VX99004 Clean & Safe Fresh Vegetables
Whitefly & Viruses
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NY9406 Downy Mildew on seedlings - factsheet

This project funded by the MAA, HRDC and Agriculture Victoria has developed an integrated management strategy for the control of downy mildew on Brassica and stock seedlings.

The disease is caused by the fungus Peronospora parasitica which discolours foliage and premature defoliation. The disease is responsible for substantial losses to seedling growers.

Authors
Elizabeth Minchinton Paul Pierce
Martin Mebalds Graham Hepworth
Ann Cass
 

Factsheet - Downy Mildew of Brassica seedlings
Download 101kb

Host range :
Strains of the fungus P. parasitica are specific to particular groups of plants.

One strain only infects Cruciferacea (e.g. broccoli, Brussels sprouts, cabbage, cauliflower and Chinese cabbage) whilst another is specific to stocks.

Seed :
Extensive seed germination and grow-on tests on broccoli, brussels sprouts, cabbages and cauliflowers failed to detect downy mildew on emerging seedlings up to 2 months after planting.

Seed does not appear to be a source of infection for the spread of the disease.

Infection :
Spores are produced overnight on the under surface of leaves and released in the morning.

Spores need wet leaf surfaces to germinate. The process of infection takes up to 3 hours. The fungus then grows within the leaf.

It takes 5-7 days for symptoms to become visible on leaves after infection.

Spread of the disease :
Old infected seedlings in a nursery, or weedy crucifer plants in the vicinity of nurseries are probably responsible for the spread of the disease.

Spores are carried on the wind from these plants to healthy seedlings.

The disease is favoured by cool temperatures in the range of 10-16 °C, consequently it is prevalent in winter.

Strategies to control the disease must consist of both management practices and fungicides spray programs.

Management strategies to reduce the disease include :

  1. Controlled Watering :
    Where possible avoid watering plants in the rroining because this is the time when spores are released and available for infection Spores need water to germinate on leaf surfaces and to infect plants.
    One heavy watering is preferable to a long light watering.

  2. Ventilation :
    Always maintain a well ventilated environmet to lower humidity and reduce spore production. This may mean fewer plants and trays per square metre.

  3. Nutrition :
    Maintain a balance program of nutrition because a potash deficiency will increase the susceptibility of seedlings to downy mildew.

Evaluation of Fungicides :
For downy mildew of stocks, either the combination of ' Foli-R-Fos'+ 'Euparen' or 'Foli-R-Fos' + 'Zineb' controlled the disease on plants grown for 8 weeks under glass.

Growing cauliflower seedlings under cover (2 weeks under glass, 2 weeks under cloth and 4 weeks outside) slows down the initial development of downy mildew, compared with growing them without cover (2 weeks under glass, 6 weeks outside).

A combination of the contact fungicide 'Euparen' + the systemic fungicide 'Foli-R-Fos' controlled downy mildew on seedlings grown with or without cover.

'Euparen' which was applied with 'Agral 60', was not phytotoxic but produced greening of foliage on seedlings.

Neither 'Foli-R-Fos' nor 'Euparen' are currently registered for control of downy mildew.

Fungicides registered for the control of downy mildew on brassicas are copper, copper oxychloride, cupric hydroxide, Mancozeb, Metiram and Zineb.

Furalaxyl is registered for ornamental seedlings. All are contact fungicides except Furalaxyl, which is a systemic.


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