The Foundation for Arable Research (FAR) and Environment Waikato are issuing a warning to all purchasers of baled sweetcorn and maize crop residue to be on the look out for two invasive  weeds, broomcorn millet and alligator weed.

Crops residues from Gisborne and Hawke's Bay may contain the invasive and difficult to control grass weed, Broomcorn millet (Panicum miliaceum). This grass weed, which is becoming increasingly prevalent in these regions, has a hard black persistent seed which could establish itself in other regions next spring if brought in the with baled crop residues.

Alligator weed (Alternanthera philoxeroides), which is prevalent in Northland, is an extremely invasive weed which outcompetes pasture and crops, and is toxic to livestock. It grows very easily from even the smallest of fragments (see photographs)

Farmers buying in crop residues from these regions should note where on the farm it is being fed, and to be vigilant next spring and summer for the presence of these invasive weeds. AgResearch and FAR are currently investigating control measures for broomcorn millet and early results should be available for the coming season.

Date	Attachment	Size
	080519 Imported crop residues may contain new weeds.pdf	44 KB #