MaisTer WG

MaisTer WG post-emergence herbicide controls a wide spectrum of broad-leaved and grass-weeds in forage and grain maize.


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(Active substances: foramsulfuron + iodosulfuron-methyl-sodium + isoxadifen-ethyl)

Main advantages

  • MaisTer WG provides the highest control and widest spectrum of grass weed control in maize particularly on difficult grasses such as black-grass, barnyard grass, couch and annual meadow grass
  • No need to tank-mix with other herbicides – controls both broad-leaved and  grass-weeds in one product
  • No following crop restrictions or special cultivations for crops grown in the year after application; very useful as maize spreads eastwards into an arable rotation including  vegetable and root crops
  • Crop safety is as good as or better than current standards

Getting the best from MaisTer WG

  • Apply MaisTer WG at a dose rate of 150 g product/ha with the adjuvant Mero ©  at 1% in 200-400 litres of water per hectare.ie. 2L Mero/ha in 200L water
  • Apply using a pressure of 2.5-3.0 bar and a spray quality of FINE TO MEDIUM (BCPC category)
  • Dry conditions resulting in moisture stress may reduce effectiveness
  • Do not spray in temperature above 25°C
  • For optimum results, apply MaisTer WG during warm weather, when soil is moist and the weeds growing actively
  • Transitory crop effects (yellow, reddish-purple, white or necrotic patches) can occur following application of MaisTer WG. These effects are transitory in nature and will not affect yield
  • To reduce the potential for adverse crop effects MaisTer WG must only be applied to a healthy crop, not suffering from stress as a result of any factor reducing crop growth. Also ensure that spray swaths do not overlap when applying MaisTer WG
  • Take extreme care to avoid damage by drift onto broad-leaved plants outside the target area or onto ponds, waterways and ditches. Because some non-target crops are sensitive to MaisTer WG, extreme care is required to avoid drift onto plants outside the target area

Important things to remember

  • Do not use in any non-CRD approved tank mixture or sequence with any other ALS inhibitor, such as a sulfonylurea
  • To avoid the build-up of resistance do not apply this or any other product containing an ALS inhibitor herbicide with claims for control of grass-weeds more than once to any crop
  • Do not spray crops under stress, suffering drought, waterlogged, grazed, lacking nutrients or if the soil is compacted
  • Do not use MaisTer WG on crops undersown or crops to be undersown, with grasses, clover or other legumes, or any other broad-leaved crop. Do not spray if rain is imminent

Following crops

  • In the year of application, only cereals can be sown after the maize has been harvested. Field vegetables may not be grown as succeeding crops in the year of application
  • In the following year, all crops may be grown safely
  • In the event of crop failure, maize can be re-drilled provided complete soil inversion to a minimum of 15 cm is conducted prior to re-drilling

Helpful pointers

Maize can be a difficult crop to grow.  So Bayer has worked with the Maize Growers’ Association to offer some general guidance. However, be sure to consult your advisor for specific recommendations that suit your farm.

Dry matter For forage maize, try to achieve 30-35% dry matter: this should lead to the same percentage of energy-rich starch. For biogas maize, try to achieve 27-31% dry matter: this will enable effective fermentation
Seedbeds Soil structure and seedbed preparation are vital: to ensure rapid rooting, deep-cultivate or plough the field, especially if it has been trafficked through slurry or FYM applications. The seedbed should be fine enough for good germination but not so fine that capping may occur
Drilling Only drill maize when soil temperature is over 8°C at 9 a.m. for seven consecutive days. To grow quickly and efficiently, maize requires warm days and nights. If you are growing under colder conditions, choose varieties from earlier ‘maturity groups’

Good germination and early vigour are essential to avoid gappy crops and achieve best yields
Pests Where you have soil pests such as wireworm, treat your maize seed with Sonido
Harvesting Later harvesting can produce higher yields but at the risk of soil compaction and run-off with potentially serious environmental effects