Canada thistle usually needs to be controlled by using multiple products.

Weed of the week: Canada thistle

Canada thistle has more than one way or reproducing, making it tougher to control

Reading Time: 2 minutes It takes more than one field action to control Canada thistle – a prolific weed with a couple tricks up its sleeve. Also called creeping thistle and field thistle, Canada thistle (Cirsium arvense) is a perennial weed that reproduces both by seed and by horizontal roots. Dense patches of new shoots can form from these […] Read more

Waterhemp is a cross-pollinating species, which improves its ability to develop herbicide resistance.

Weed of the week: Waterhemp

The challenging weed rapidly develops resistance, so rotating herbicides is critical

Reading Time: 2 minutes Waterhemp can be controlled through a variety of approaches, but identification is often difficult. The weed — a non-native member of the pigweed family first discovered in Lambton County in 2002 – is an annual plant producing tens of thousands of seeds every year. It features narrow leaves, wavy leaf margins, and (almost completely) hairless […] Read more

Herbicide-resistant redroot pigweed continues to spread.

Weed of the week: Redroot pigweed

Economic thresholds run from five to 15 plants per 10 metres of row

Reading Time: 2 minutes Redroot pigweed can be a tough customer. But don’t wallow in despair – control is possible. Redroot pigweed (Latin name Amaranthus retroflexus) is an annual weed found throughout Ontario in cultivated fields, gardens, pastures, waste places, roadsides and, according to the Ontario Ministry of Agriculture, Food and Rural Affairs, nearly any other disturbed area. While […] Read more