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dead weed

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Catalogue: Ground Cover
A bridge too far - weeds a reservoir for hidden diseases.. Weeds that survive in a bridge, both living and dead, harbour multiple crop diseases including crown rot, rust and powdery mildew, says Sue Thompson from the Queensland Department of Agriculture, Fisheries and Forestry (DAFF)... Controlling weeds in green and brown bridges is a community issue and requires neighbours to work together to remove volunteers and weeds, Ms Thompson says...
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Catalogue: Ground Cover
Sunflower researcher Sue Thompson, from the Department of Agriculture, Fisheries and Forestry Queensland (DAFFQ), says that while the exotic fungi that causes the disease ( Diaporthe helianthi ) is not present in Australia, several other damaging endemic species of Diaporthe have been found on infected Australian sunflowers... "Previously it was thought that D. helianthi was the sole species which caused stem canker, but we have now identified four new species - D. gulyae , D. novem , D. kongii and D. kochmanii - as well as six different species on other host plants and weeds," Ms Thompson says... Ms Thompson says the discovery of Diaporthe species on surrounding weeds and stubble is just as significant as discovering the species on the infected sunflowers...
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