Giant Hogweed problem can be treated with Glyphosate

Local authorities are under pressure from residents concerned about recent reports of injuries caused by Giant Hogweed.   Glyphosate is an approved pesticide to control this invasive weed.

“The stems and leaves of this invasive weed are covered with small hairs coated with poisonous sap. Even the slightest touch can cause painful blisters and severe skin irritation,” explains Monsanto’s Technical Manager. “Symptoms are often worse in the presence of direct sunlight as the reaction is photosensitive.”

“The recent warm weather has seen families enjoying open spaces, where they may come into contact with Giant Hogweed if it is not effectively controlled.”

Monsanto warns “While some grounds managers aim to tackle Giant Hogweed by mechanical means, cutting every two weeks below ground level before the plants reach 1.5m will reduce colonies but is very labour intensive and the risk of sap contact is high.”

Spraying with a vehicle mounted sprayer or knapsack or weed wiper application are all effective and stem injection is a useful method when working amongst desirable plants and shrubs or near watercourses.  Contractors need the correct licences to apply approved pesticides.