Anthracnose of Lupins and Tomatoes

Colletotrichum gloeosporioides

Description:

A fungus that attacks a wide range of species and is particularly significant in affecting the ripening fruit of Tomatoes. In Tomatoes small round water soaked and slightly depressed spots appear that develop into sunken, light brown depressions about 12 mm diameter with concentric rings of darker fungal fruiting bodies. These can be dense enough to turn the centre of the lesion black. In warm humid conditions the whole fruit may be rotted.

Species Affected:

Lupins especially White Lupins (Lupinus albus), Tomatoes.

Biology:

Favoured by temperatures around 250C and high humidity.
The disease may be carried on the seed and this is the main method of disease transmission.
Diseased fruit on or in the soil can infect new plants.
Spores are spread by raindrop splash.

Life Cycle:

Origin and History:

Distribution:

Most common on fruit near the soil.

Significance:

Management and Control:

Lupins

Use healthy seed.
Apply fungicide seed dressings. Thiram is best for reducing seed transmission but provides little seedling protection. Carbendazim provides some seedling protection but poorer protection against seed transmission and is preferred where seed is inoculated as it is less deleterious to rhizobia than thiram. Mixtures of carbendazim plus iprodione provide reasonable control of anthracnose and brown leaf spot. Rates of 100 g of iprodione(Rovral250) plus 100 g carbendazim500 per 100 kg lupin seed appear adequate 1296
Plant resistant varieties or species.
Quarantine restrictions apply to seed movement from infected areas e.g. from WA to SA, Vic and NSW.

Tomatoes:

Harvest fruit before it ripens and keep it dry.
Apply fungicides from when fruit starts to ripen.

Related and Similar Species:

References:

1291

Acknowledgments:

Collated by HerbiGuide. Phone 08 98444064 or www.HerbiGuide.com.au for more information.