Diffuse simple invasive wasp control method - SciDev.Net Latin America and the Caribbean

[SANTIAGO] An effective technique developed by rangers of a national reserve of Chile to control the yellow wool wasp (Vespula Germanica) , is broadcast through a video on YouTube so that it can be replicated and eliminate this invasive species.

Launched on December 30 by the National Forest Corporation (Conaf) and the GEF Invasive Species Project (EEI) of the Chilean Ministry of the Environment, the video shows in two minutes the "Clarillo method", developed in 2007 The Rio Clarillo national reserve (Metropolitan Region), and whose success led to it being used today in 20 of the country's 101 protected areas.

The method uses as bait chicken liver mixed with a little of the insecticide Fipronil . This bait is deposited in containers made with the base of soda bottles, which are hung on branches at 2 meters from the ground.

Wasps tear the meat to take it to the wasp where the queen and workers are fed she. Individuals die poisoned and their remains contaminate the colony. "In three days the hornet is eliminated," says Fernando Baeriswyl, national coordinator of the GEF EEI Project.

A follow-up in Rio Clarillo concluded that between 2007 and 2012 the nests dropped from 700 to only two. Considering that each one houses between 4,000 and 7,000 individuals, in five years between 2.8 and 4.9 million wasps were eliminated in the reserve.

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In Río Clarillo, the decrease in tourism due to these wasps Caused annual losses of US $ 150,000.

They also damage fruit trees to feed on sugars, compete with natural pollinators for flower nectar, and provide protein by devouring from insects and honey bees to hummingbird chicks, ecosystem.

Misael Cuevas said that the National Apicultural Network that he chairs will join this campaign this year and another promoted by the Ministry of Agriculture. "Wasps can attack about twenty families of beekeepers per beekeeper. Each family is US $ 120, a high sum for a small producer, "he says.

Before replicating the method in other countries - such as Argentina, where it is also found, in addition to Australia and New Zealand, among others -, Baeriswyl tells SciDev.Net that " to know the efficiency of the bait, since unknown variables could diminish its attraction. "

& gt; Watch the video of the Wasp Control Clarinet method

  • Adam Floyd