AgPest Alert: 15 December 2020

Apply herbicides to yellow bristle grass before seed heads ripen

Region: Northland, Auckland, Waikato, Bay of Plenty, Taranaki

Apply herbicides to yellow bristle grass before seed heads ripen. Avoid moving stock from infested to clean paddocks – seeds can survive in dung.

Don’t make hay from paddocks heavily infested with yellow bristle grass or other summer growing grass weeds – the seeds can survive in hay. In contrast, yellow bristle grass seeds are highly unlikely to survive in well-made silage and wrapped baleage.

Make note of porina flights

Region: Waikato, Hawke’s Bay, Taranaki, Whanganui, Manawatū, Wellington, Nelson, Tasman, Marlborough, Canterbury, West Coast, Otago, Southland.

Look for and note porina flights as these can indicate when to adopt control measures later if required.

Be vigilant for velvetleaf

Region: All NZ

Velvetleaf seed was introduced to NZ as a contaminant of some fodder beet seed and planted in many properties throughout NZ. Therefore, if you have either grown fodder beet or received fodder beet onto your property you need to be vigilant and keep an eye out for this weed and do not let it establish on your property. Velvetleaf is declared Unwanted Organism by MPI and occurrences must be reported and dealt with. For more information phone the MPI hotline 0800 80 99 66 or go to MPI or go to AgPest, or contact your regional council.

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