AgPest Alert – 15 January 2019

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.


Watch for second porina moth flights

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

The early flight of porina moths has passed but the second significant flight is about to occur in the South Island and could take place anytime between now and the end of February. Further flights may occur in March in the North Island. In areas that experienced an early (October/November) porina flight, mid-January to mid-February is the optimal time to be applying diflubenzuron.

Argentine stem weevils increasingly significant in Summer

Region: All NZ

Argentine stem weevils increase in significance over summer. Be aware that seedling grasses, even those infected with endophyte, are very susceptible to damage from this pest if numbers are high. This also applies to cereal and maize crops. Coated seed or pre-emergence insecticide application can prevent damage.

Clover root weevil adults abundant

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.


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