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NY9406 Downy Mildew on seedlings - factsheet
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NY97011 Downy Mildew on seedlings - extension
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Parsley Disease Handbook
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Phytochemical composition of food
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Sclerotina - Lettuce Conference 2002
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Summer Root Rot in Parsley
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Vegetable Disease Program
Vegetable Diseases in Australia
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VG00013 Leek Diseases
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VG00031 Peas - downy mildew & collar rot
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VG00044 Clubroot - Applicator design
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VG00044 Clubroot – Introduction
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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
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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
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VG02020 Capsicum - Sudden Wilt
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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
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VG04014 Better Brassica
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VG04014 Clubroot Guidebook
VG04014 Clubroot Poster
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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
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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
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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
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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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VG07070 Predicting Downy Mildew on Lettuce

Downy mildew is a devastating fungal disease of lettuce, especially in autumn and spring crops.

Disease resistant varieties are an important management tool for downy mildew. But the fungus usually overcomes this resistance so new resistant varieties must continually be breed.

There is also a high risk of the fungus developing resistance to the most popular systemic fungicides. Fungicides should be used only when necessary, to avoid selecting fungicide resistant strains.

The project aims to combine a number of disease predictive models for downy mildew of lettuce that were developed overseas.

These models use microclimate data, collected by a weather station located in a crop, to identify high disease risk conditions.

The crop can then be treated only when necessary. If conditions do not favour the disease, spraying will not be necessary and with fewer fungicide sprays are needed.

Authors
Liz Minchinton
Joanna Petkowski

VG07070 - Benchmarking predictive models, nutrients and irrigation for management of downy and powdery mildews and white blister - Lettuce Downy Mildew 2009
Download 14kb

Progress report :

The downy mildew model has two parts :

  1. predicting when the fungus will produce and release spores from infected leaves

  2. predicting when the spores will infect healthy leaves

We need to be confident that the British model will accurately predict downy mildew under Australian conditions.

To test the model we placed spore traps in lettuce crops to track when spores are produced. Infection of the crop was tracked by placing lettuce seedlings amongst the crop plants for a 24 hour period at regular intervals throughout the life of the crop. Seedlings are good indicators of infection events because they are very susceptible to mildew.

The spore release and infection data was checked against the models predictions of disease.

So far, the model has not been accurate enough to predict all sporulation and infection events in the crops. The model has not consistently predicted the disease that developed on the indicator lettuce plants and needs to be adjusted and further tested to improve its accuracy.

Ultimately, the model will be an integral part of an IPM program for lettuce.

The model will be further developed and checked for accuracy using spore trapping and trap plants.

The modified model will be tested over several seasons on cos, fancy and iceberg lettuce.

The economics of controlling the disease using the model will be compared against the weekly spray program and soft pesticide options.

Acknowledgments :

The authors wish to thank Boomaroo nurseries for providing the lettuce seedlings used in this trial.

This project was formed by Government agencies, private industry, universities and international researchers, to benchmark disease predictive models for major vegetable crops.

Funding was provided by Australian vegetable growers (through the R & D levy) and the Department of Primary Industries, Victoria. The Australian Government provides matched funding for all HAL's R&D activities.


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