UBC researchers weed out ineffective biocontrol agents
'Keep it simple' is a good rule of thumb when designing biocontrol programs to combat weeds and invasive plants, according to a meta-analysis of studies by UBC biodiversity experts.
Biocontrol programs use an invasive plant's natural enemies (insects and pathogens) to reduce its population. Most biocontrol programs combine many different enemies – typically about three different species, but sometimes as many as 25 – with the hope that at least one will prove effective.
But more isn't necessarily better. Some combinations of enemy species can actually end up competing ...