2017 Tips and Tactics: Reducing Herbicide Damage
- Managing weeds in summer fallows conserves soil water for subsequent
crops and reduces the weed seedbank for subsequent seasons.
- Drift from the application of herbicides (and from Group I phenoxy herbicides
in particular) has caused significant damage to crops in recent years.
- Improved spraying practices are needed along with better understanding
of and response to weather and other environmental conditions.
- During summer across the northern grains region, there are only a limited
number of hours when conditions are conducive for spraying with low
- 2,4-D amine formulations have relatively low volatility, meaning they are
effectively non-volatile when used in accordance with label requirements. As
such, the large majority of damage is likely to arise from spraying during local
surface temperature inversion conditions and from incorrect boom setups.
- In some cases symptoms and damage may be from roots taking up residual
2,4-D in the soil from previous applications.
- While cotton is less sensitive to some other Group I herbicides when
compared to 2,4-D, simply switching to these alternate Group I herbicides
is unlikely to significantly mitigate risk. Attention must be given to the
weather and other application factors involved.
- Alternate herbicide options exist for key weed species (such as fleabane)
where 2,4-D is currently being used. These include a range of pre- and
Link to this content using: https://grdc.com.au/TT-ReducingHerbicideDamage
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