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Ministry of Agriculture, Food and Rural Affairs

Glufosinate Ammonium

Trade Names: Ignite, Liberty 200SN

Registration status: This herbicide (Ignite) is registered for use in established tender fruit orchards.

When to suspect injury: Injury may occur from drift up into trees from under-tree applications, or from neighbouring fields under windy conditions. If you notice symptoms of leaf spotting or necrotic plants, look carefully at neighbouring fields, and at weeds in the treated area.

Herbicide Information:  Knowing how the herbicide works will help to determine the likelihood of injury from either direct application or drift.  Consider how the herbicide works in plants, behaves in soils and what symptoms are common in other plants.  

Chemical Family: Unique

Site of Action/Group: Inhibitors of glutamine synthetase/ WSSA Group 10

General Symptoms in Plants

  • In 3- 5 days, plants becomes chlorotic and wilted
  • In 1- 2 weeks, plants become necrotic
  • Bright sunlight, high humidity and moist soil increase the rate of development of these symptoms

Symptoms in Tree Fruit

  • Leaves will have spots where spray droplets contact
  • If enough droplets contact a leaf, it will become chlorotic in a few days, and wilt and die in 1-2 weeks
  • Contact with trunks with green bark (not callused and brown) may also result in splitting injury

Uptake and Translocation

  • Absorbed through foliage
  • Minimal translocation- dependent on application rate and species treated


  • None
  • No cropping or rotational restrictions after application

If you suspect herbicide injury, laboratory analyses of herbicide levels in plant tissue are necessary to confirm the presence of herbicides, although symptoms may be helpful in diagnosing which herbicides caused the problem.

Both damaged and healthy plant tissues should be analyzed, because comparison levels are not readily available for many herbicides. Contact your lab for instructions on which plant parts should be sampled, how to handle and ship the sample, and what costs are involved to ensure an accurate and timely diagnosis.

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