Matters of Facts No.7 download pdf 121kb - Vegetable Growers ...

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Matters of Facts No.7 download pdf 121kb - Vegetable Growers ...

DEPARTMENT OFPRIMARY INDUSTRIESVegetable Matters-of- FactsBased on research funded by the vegetable growers levy, Horticulture Australia and DPINumber 7August 2003Sclerotinia Lettuce DropControl of Sclerotinia Lettuce Drop :• Good drainage Irrigate early in the day• Crop rotation Remove crop trash after harvest• Cultivar type Biological controls• Wider plant spacing Chemical fungicidesWhat is “Sclerotinia lettuce drop”Sclerotinia lettuce drop is caused by the fungusSclerotinia minor.LETTUCESclerotinia head rot is caused by the closelyrelated fungus, Sclerotinia sclerotiorum whichalso affects many other plants besides lettuce.What does “lettuce drop” look like ?• Lettuce drop starts at the base of the stem.• The stem rot quickly spreads to the roots andthe head.• The older leaves wilt and die first.• Plant collapse (drop) often occurs close toharvest.• A white cottony mould is producedcontaining many hard black bodies called“sclerotia”. Sclerotia allow the fungus tosurvive for many years in the soil without ahost.For more information please contactyour local Veg Cheque officer.Stephanie Andreata Gippsland 5172 2133Sally-Ann Henderson Northern Vic 5051 4500Bruce Fry South West Vic 5233 5510Craig Murdoch Melbourne 9210 9222


“Development of biologicalcontrols for Sclerotinia diseases ofhorticultural crops in Australasia”HAL Project : VG 00048Field trials have evaluated a variety of biological andsoil amendment treatments for control of lettucedrop (Sclerotinia minor). The effectiveness of severalalternative chemical controls and grower concernsover continual use of procymidone were alsoassessed.Bio-control treatments reduced lettuce drop by 30to 60%, at low disease pressure (

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