AgPest Alert – 3 January 2019

Happy New Year!

Watch for aphids, diamondback moth & white butterfly caterpillars in brassica crops.

Region: All NZ

Keep an eye on aphids, diamondback moth caterpillars and white butterfly caterpillars in brassica crops. With warm summer temperatures these can increase quickly. Treating these pests before high numbers occur will provide greatest economic return. But check that natural predators and parasites are not already providing control.

Plantain moths and caterpillar populations may be high

Region: Bay of Plenty, Waikato, Gisborne, Hawke’s Bay, Taranaki, Manawatu-Whanganui.

Plantain moths and caterpillars populations may be high or building up. Apply insecticide early to prevent damage occurring.


Black beetle larvae damage maybe showing

Region: Northland, Auckland, Bay of Plenty, Waikato

In the northern North Island, damage from black beetle larvae may be showing. Unfortunately little can be done to prevent this. Adults are deterred by some endophyte-infected grasses which will reduce egg laying and larval numbers. See DairyNZ Pasture Renewal Guide.

Watch for Tasmanian grass grub beetle flights

Region: Gisborne, Hawke’s Bay

Watch for Tasmanian grass grub beetle flights, large numbers of beetles flying may indicate potential damage from the larvae in autumn and winter.



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