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Ministry of Agriculture, Food and Rural Affairs


Trade Name: Chateau, Broadstar, Payload, Sureguard, Valtera

Registration status: This herbicide is registered for use on established trees in 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. Use only on dormant pears, and avoid applications within 100 m of non-dormant pears. If you notice symptoms of leaf reddening, bleaching or necrosis, 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: Dicarboxamide

Site of Action/WSSA Group: Inhibitors of protoporphyrinogen oxidase (Protox)/ Group 14

General Symptoms on Plants

  • Reddening and necrosis of leaves
  • Stunted growth

Symptoms on Fruit Trees

  • Spotting or burning of leaves or tip burn where the spray contacted crop foliage
  • Injury will not spread to other parts of the plant; leaves developing after application will be unaffected
  • Usually residues from previous crops are not a problem

Uptake and Translocation

  • Primarily taken up by the roots of treated plants following soil applications
  • Movement in the phloem is limited because of the rapid foliar desiccation caused by the herbicide


  • The length of residual activity is dependent on application rate, rainfall and temperature conditions following application (generally 4-6 weeks)

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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