A study done at the University of Quebec at Three-Rivers concludes that it greatly complicates the life of the grubs, leaving the grass longer.
The summer of 2013 has been the season of white grubs in Three Rivers. The sports fields of the city have been infested, such as hundreds of lawns of private citizens.
Everywhere, the grass became yellow and rub his foot on the ground was enough to reveal the critters that feed on the roots of the lawn.
Since then, the City is investing $ 30,000 per year to protect its lands.
“When the grass is higher, the adult insects causing white grubs, have more difficulty to go to lay their eggs on the ground, so there is less to white,” sums up Cynthia Simard, of the City.
The grubs become japanese beetles or european chafers.
Christopher Watson, a postdoctoral fellow in environmental sciences at the University of Quebec at Three-Rivers, is the author of this study, conducted in partnership with the City.
Ecology and economy
The analysis, which compiles forty independent studies, concludes that a lawn longer will resist better to drought and invasive plants, such as ragweed. It will present a better biodiversity and will cost less maintenance.
“Just wait one more week before you mow, or five centimeters long, it makes a significant difference “, he says.
For the City, it is a best environmental practice and a money economy.
If it reduced the mowing land heavily used from 15 to 10 times per summer, and the cup of land unlikely to be used three times per year, the cost could go from $ 800,000 to approximately $ 550,000.
However, it is too early to quantify the gains in connection with the first not of the City in this folder.
Life of insects
The researcher believes that it is necessary to also address the prejudices surrounding a grass is longer.
“This is an issue a little difficult because the majority of citizens in a city do not like insects “, let-t-he fall.
Status Facebook of the actor Leonardo DiCaprio, who has relayed the results of this study in January.
Made funny : the actor Leonardo DiCaprio posted on Facebook a link bearing on this study in January.
“It is good ! But this is not the reason for which we made the study. It’s still a way to bring science to the public “, commented Christopher Watson.