eradicate silver grass
Winter cleaning of Silver grass significantly increases the clover composition and maintains the pasture comparatively free of silver grass for up to 5 years after spraying. Silver grass is a voracious user of water and nutrients but has very low nutritional value to grazing stock. Winter Cleaning involves spraying an improved pasture with a combination of Simazine and Paraquat. It also partially controls other annual grasses such as brome grass, barley grass and winter grass. The objective is to kill the standing mass of silver grass and prevent the emergence of successive germinating silver grass seed for up to three months after application. It has no adverse effect on sown perennial grass or clover in spring. When there is no competition the clover present in the pasture spreads into the gaps, thickens up and significantly improves the pasture quality. Optimal times to spray are; May / June if there has been an early or “normal” autumn break. Mid August to mid September if there is a late or stop start autumn break. Successful spray program in these months is due to sufficient soil moisture at the time of Spraying, & favourable growing conditions. There is no impact on sown perennial grasses after spraying. Spraying should not continue after mid September as it may reduce the flowering and seed set of early maturing clovers such as Trikkala. If spraying late, consider spaying a greater number of paddocks, as there is usually abundant feed in other paddocks that can carry the extra stock numbers. During 14 day withholding period after spraying. When spraying late it is critical to crash graze the pasture down to a height of less than 5 cm before spraying. This increases the efficacy of the spray program.
eradicate couch grass
Couch grass can dominate ryegrass-clover pasture and choke out desirable species if left unchecked. Couch grass is a low-growing perennial with grey-green leaves and runners which root readily. It spreads rapidly by seed and runners. It is important to kill couch grass completely before sowing a new perennial pasture. Trans located, selective herbicides have been found to be the most effective products for the control of couch grass but they will normally kill all grasses present including desirable species such as ryegrass. Non-selective herbicides such as glyphosate can also be used as part of a staged control program. Spray in year prior to new pasture to allow ample time for effective control.
1. Spray out the couch when it is actively growing using a chemical with glyphosate as the active constituent
2. Leave for approximately 1 month to allow effective absorption before cultivation or a follow-up spray with more glyphosate.
3. Scarifying or ripping the couch grass and bringing the runners to the surface is recommended to dry them out.
Rotary hoeing or disking buries the runners under the ground, where they can lie dormant for many months.
4. A brassica or millet crop blended with clovers and or tonic plantain can be sown in spring and has the potential to produce up to
10 tonne of dry matter over the late spring summer period when the majority of feed has finished. The key is to use a
This is intended as a guide only. Please consult your local agronomist for specific recommendations and always refer to the label.