The successful establishment of forage seed is dependent on good planning and management. Some key aspects to address prior to and after planting include soil fertility, weed control, seedbed preparation and pest management.

There are generally no ‘silver bullet’ solutions associated with pest management. There can be large variations in specific pest populations across seasons, regions and even within different paddocks on farm. The best approach is to implement a programme that utilises different pest management tools such as seed treatment, ‘broadacre’ spray application, slug bait application and, in pasture, novel endophyte (e.g., AR1 or AR37).


Under a no-tillage system the pest burden can be very high due to the existing plant matter acting as a host for insects, therefore good pest management practices are critical. Applying contact insecticide with the last glyphosate spray will reduce the adult populations of pests, such as Argentine Stem Weevil and Springtail. Sowing treated seed will protect the pasture or forage crop against eggs, larvae and adults that are present at the seedling stage. Slug bait should be applied if there is a risk of Slug damage to seedlings.


With intensive farm systems the time frame from cultivation to sowing is generally quite short, and therefore it is good practice to apply a contact insecticide if an old pasture is being sprayed out prior to cultivation to help reduce the pest burden. Cultivation can help reduce populations of soil dwelling pests such as Grass Grub. Sowing treated seed will protect the pasture or forage crop against insect pests that are present at the seedling stage.


The application of chemicals on seed can change the flow rate of seed passing through a drill, so it is important to calibrate the planting equipment before sowing. The optimal sowing depth for forage seed ranges between 10-25 mm below the soil surface, depending on the species. Treated seed should be sown into a fine, firm and moist seedbed.


Be aware of the presence of bee hives or crops in the flowering stage adjacent to the field which could attract pollinators during planting.


Newly sown pastures and forage crops need to be regularly monitored in the first few weeks after sowing and if necessary an application of contact insecticide may be required if pest populations are high.


All agricultural chemicals registered in New Zealand, including seed-applied chemicals, are rigorously assessed and have ACVM and HSNO/EPA controls applied to ensure they do not present unacceptable risk to humans, animals, bird life or the environment.


Precautions should be taken when handling seed treated with chemicals. Treated seed can cause allergic reactions for some individuals. Gloves and a mask are recommended. Avoid contact with skin and eyes and wash hands thoroughly before meals.


Treated seed should be stored in a cool, dry environment away from direct sunlight. Keep out of reach of children, livestock, birds and the general public. For best results, treated seed should be sown in the season of purchase.


Livestock should not graze insecticide treated forage crops and pasture for a period of six weeks after sowing. For grass seed undersown into an existing pasture sward, the withholding period is three weeks after sowing due to the dilution effect from existing plant material which is pesticide free.

For further information refer to the following publication:
‘Stewardship Guide, Handling and Planting Treated Seed’ on
For urgent medical advice 24 hours a day, 7 days a week, call the National Poisons Centre (NZ) 0800 POISON, 0800 764 766.