Crop Action: Issue 4 2023

This Arable Update outlines practical strategies for using SDHIs effectively in the field while protecting their long-term efficacy.

This Update outlines the latest results on how Zymoseptoria tritici (Zt), the fungus that causes Septoria tritici blotch (STB), is responding to succinate dehydrogenase inhibitor (SDHI - Group 3) fungicides in New Zealand wheat crops.

This Arable Update illustrates how alternating and mixing Modes of Actions and active ingredients can help sustain disease control, protect yield, and deliver financial returns.

This Update outlines the latest results on how Zymoseptoria tritici (Zt), the fungus that causes Septoria tritici blotch (STB), is responding to triazole fungicides in New Zealand wheat crops.

Farmers who save and replant legally protected cereal varieties can voluntarily declare their usage and pay a breeder royalty. The declaration system applies to all farm saved seed barley, and to farmer saved wheat if the resultant wheat crop does not pass through an end-point royalty collection agent. 

Crop Action keeps you up to date with arable crop development and actions right across New Zealand.

Maize is one of the easiest crops to mechanically weed and levels of weed control comparable to herbicides can be achieved. Find out more about the options available and how they work in this maize update.

Weed related yield losses ranging from 15% to 56% for silage and 15% to 61% for grain have been observed in New Zealand maize systems. In this maize update find out management strategies for a number of common annual and perennial weeds of maize.

The Environmental Protection Authority (“EPA”) published a Notice of Direction Prohibiting the Use and Requiring Disposal of Chlorpyrifos Containing Substances in the New Zealand Gazette on 1 September 2025.

Crop Action keeps you up to date with arable crop development and actions right across New Zealand.