AgPest Alert – 15 February 2019

Watch for Tasmanian grass grub beetle flights 

Region: Gisborne, Hawkes Bay

Watch for Tasmanian grass grub beetle flights. Beetles are attracted to lights at night. Large numbers of beetles flying may indicate potential damage from the larvae in autumn and winter.


Clover root weevil damage becoming obvious

Region: All NZ

Clover root weevil adults are abundant and damage to clover leaves will be obvious in most areas. Unless severe this is not significant damage and does not mean the biocontrol agent is absent.


Pasture renewal should incorporate non-clover break to combat Clover root weevil

Region: All NZ

Clover root weevil.  Pasture renewal should incorporate a non-clover break crop. This weevil cannot survive in the absence of clover so a clover-free break crop provides a temporary weevil-free environment that will allow clover seedlings to establish before the weevil reinvades. This will also reduce plant nematodes, plant pathogens and weeds and benefit the new pasture.


Early treatment of grass grum will maximise returns

Region: Bay of Plenty, Waikato, Gisborne, Hawkes Bay, Taranaki, Manawatu-Whanganui, Wellington, Nelson-Tasman, Marlborough, Canterbury, West Coast, Otago, Southland.

In grass grub prone areas 2- and 3-year-old pastures should be inspected to determine if potentially damaging levels are present. Early treatment will offer the most protection and maximise returns from the cost of intervention.


Watch for clover flea damage in the North of NZ

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

In Northland, South Auckland, Waikato and the Bay of Plenty watch for clover flea damage to clover and treat early if required to maximise effectiveness. See NZ Novachem Agrichemical Manual.


Be vigilant for Velvetleaf

Region: All NZ 

In 2016 velvetleaf seed was introduced to NZ as a contaminant of fodder beet seed and planted in many properties throughout NZ. To date, more than 250 properties have been found to be infested with this terrible weed. Six different lines of fodder beet seed have been identified as contaminated but there could be others that were not picked up. Similarly, there may be paddocks where velvetleaf was present but not found. 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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