@article {4456, title = {Phosphorus acid for controlling Phytophthora {\textquoteleft}taxon Agathis{\textquoteright} in kauri: glasshouse trials. }, journal = {New Zealand Plant Protection}, volume = {66}, year = {2013}, pages = {242-248}, abstract = {

Phytophthora taxon Agathis (PTA) is a serious problem in Auckland and Northland kauri forests. Phosphorous acid (phosphite) is a potential treatment for infected or threatened trees. In vitro tests on phosphite-amended agar showed that PTA was more sensitive to phosphite than other Phytophthora species commonly controlled by this chemical. Before progressing to forest trials, phosphite efficacy was tested on PTA-inoculated kauri seedlings in the glasshouse. Two-year-old kauri seedlings were inoculated with PTA applied directly to trunk wounds or by soil application. Phosphite was applied as a foliar spray, as a trunk injection or as a soil drench either 5 days before or 5 days after inoculation. All untreated control trees died, whether trunk- or soil-inoculated. With phosphite injection, survival was 100\% following PTA soil inoculation and 67\% following trunk inoculation. Foliar spray and soil drench-applied phosphite treatments were less effective than trunk injection, although some trees survived.

}, issn = {1175-9003 (print), 1179-352X (online)},}, url = {http://www.nzpps.org/nzpp_abstract.php?paper=662420}, author = {Horner, I.J. and Hough, E.G.} }