Phosphite and metalaxyl rejuvenate macadamia trees in decline caused by Phytophthora cinnamomi

Akinsanmi, Olufemi A. and Drenth, Andre (2013) Phosphite and metalaxyl rejuvenate macadamia trees in decline caused by Phytophthora cinnamomi. Crop Protection, 53 November: 29-36. doi:10.1016/j.cropro.2013.06.007


Author Akinsanmi, Olufemi A.
Drenth, Andre
Title Phosphite and metalaxyl rejuvenate macadamia trees in decline caused by Phytophthora cinnamomi
Formatted title
Phosphite and metalaxyl rejuvenate macadamia trees in decline caused by Phytophthora cinnamomi
Journal name Crop Protection   Check publisher's open access policy
ISSN 0261-2194
1873-6904
Publication date 2013-11
Year available 2013
Sub-type Article (original research)
DOI 10.1016/j.cropro.2013.06.007
Volume 53
Issue November
Start page 29
End page 36
Total pages 8
Place of publication Netherlands, Amsterdam
Publisher Elsevier BV
Collection year 2014
Language eng
Formatted abstract
Phytophthora cinnamomi is a significant pathogen of macadamia but little information on disease management exists. Through a series of glasshouse and field trials using different rates and modes of application of phosphite, this study provides data and information on effective application rates of phosphite for the control of macadamia tree decline caused by P. cinnamomi. We also determined the efficacy of bark spray application of phosphite and soil drench application of metalaxyl on recovery of declining macadamia trees. Overall, our results indicate that regardless of the method of application, biannual applications of phosphite during autumn and spring root flushes in macadamia are effective control options for tree decline. Phosphite applied as trunk injection resulted in relatively higher detection of phosphonic acid levels in the plant tissues compared to other methods of application, and the phytotoxic effect was also more severe than foliar spray application. Foliar and trunk spray application of phosphite or soil drench with metalaxyl-M resulted in consistent (R2 > 0.98) rejuvenation of diseased trees over 3 years compared to untreated control trees that continued to decline (y = 1 + 0.22ln(x); R2 = 0.96). Phytotoxicity of phosphite on macadamia leaves occurred at relatively lower rates than indicated for other tree crops. The sensitivity of macadamia to phosphite relative to other tree crops is discussed.
Keyword Metalaxyl
Oomycete
Root rot
Phosphonates
Proteaceae
Soilborne pathogen
Root-Rot
Potassium Phosphonate
Fungicide Phosphite
Phytotoxicity
Biodegradation
Translocation
Colonization
Acibenzolar
Queensland
Starvation
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Queensland Alliance for Agriculture and Food Innovation
Official 2014 Collection
 
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