Skip to Content
Doctor of Philosophy, (Plant Science)
Study Completed: 2015
College of Sciences
Aspects of Herbicide Resistance in Three New Zealand Weed Species
Glyphosate and dicamba are two important herbicides used in New Zealand agriculture. Mr Ghani Zadeh studied several aspects of glyphosate resistance in ryegrass from Marlborough vineyards and dicamba resistancve in fathen from Waikato maize fields. He quantified the level of resistance in these weed species then developed quick tests for detecting their resistance. He determined the mechanisms of glyphosate resistance in this ryegrass, and showed that the glyphosate resistance gene can spread via pollen. Other findings from his research concluded that the glyphosate-resistance mechanism is temperature dependant so will disappear under cool temperatures typical of winter. Glyphosate-resistant ryegrass populations were all resistant to glufosinate and some were also resistant to amitrole; the two main alternative herbicides to glyphosate used in vieyards. Mr Ghani Zadeh''sresearch provides useful insights into the management of herbicide resistance in New Zealand.
Dr Kerry Harrington
Dr Trevor James
Dr David Woolley
H Ghanizadeh, KC Harrington, TK James and DJ Woolley (2013) Confirmation of glyphosate resistance in two species of ryegrass from New Zealand vineyards. New Zealand Plant Protection 66, 89-93
H Ghanizadeh, KC Harrington, TK James and DJ Woolley (2015) Quick tests for detecting glyphosate-resistant Italian and perennial ryegrass. New Zealand Journal of Agricultural Research. 58, 108-120
H Ghanizadeh, KC Harrington, TK James and DJ Woolley (2015) A quick test using seeds for detecting dicamba resistance in fathen (Chenopodium album). Australian Journal of Crop Science. 9, 337-343.
H Ghanizadeh, KC Harrington and TK James (2015) Glyphosate-resistant Lolium multiflorum and Lolium perenne populations from New Zealand are also resistant to glufosinate and amitrole. Crop Protection. 78, 1-4.
H Ghanizadeh, KC Harrington, TK James, DJ Woolley and NW Ellison (2015) Mechanisms of glyphosate resistance in two perennial ryegrass (Lolium perenne) populations. Pest Management Science (in press).
H Ghanizadeh, KC Harrington and TK James (2015) Glyphosate-resistant population of Lolium perenne loses resistance at winter temperatures. New Zealand Journal of Agricultural Research (in press).
H Ghanizadeh, KC Harrington, TK James, DJ Woolley and NW Ellison (2015) Restricted herbicide translocation was found in two glyphosate-resistant Italian ryegrass (Lolium multiflorum) populations from New Zealand. Journal of Agricultural Science and Technology (in press).
Page authorised by Web Content Manager
Last updated on Tuesday 04 April 2017