|Australian Flora Foundation|
Final report on the grant
Biological control of Phytophthora cinnamomi in Thryptomene
spp. using manure treatments
Results from this project clearly demonstrate that antagonists can reduce Phytophthora cinnamomi dieback severity in Thryptomene calycina in the field as it can in glasshouse pot trials. The addition of compost or compost with antagonists significantly reduces the rate of infection, reduces Phytophthora cinnamomi in the soil, and promotes the growth of Thryptomene calycina.
Phosphonate was shown to protect Thryptomene calycina, Banksia grandis and Banksia spinulosa against Phytophthora cinnamomi in the field. It significantly reduced symptom severity and plant deaths due to Phytophthora cinnamomi without affecting pathogen survival or plant vigour.
Previous studies had shown that compost containing chicken manure was
found to be the most effective compost for eliminating Phytophthora
cinnamomi, and although this material was suitable for Thryptomene
calycina, the phosphorous concentration in the compost was toxic
for Banksia grandis and Banksia spinulosa, negating
any beneficial effects of antagonists. Further investigations are proposed
to determine suitable composts for use with phosphorus sensitive plants