Toward a push-pull strategy against invasive snails using chemical and visual stimuli

Area of Science:

• Agricultural Entomology
• Invasive Species Management
• Pest Behavior

Background:

• Four invasive Mediterranean snails cause significant economic losses ($170 million annually) to Australia's grain industry.
• Snails contaminate crops like wheat, barley, and canola during their summer estivation on plant stalks, coinciding with harvest.
• Current snail management methods have shown limited success in controlling populations.

Purpose of the Study:

• To investigate the efficacy of a push-pull strategy for managing invasive snail populations in cultivated fields.
• To identify effective visual and chemical stimuli to manipulate snail estivation behavior for pest control.

Main Methods:

• Tested artificial estivation supports of various colors under laboratory and field conditions to determine optimal attractiveness.
• Evaluated different substances (garlic, coffee, coffee grounds, copper) as chemical deterrents against snails.
• Assessed the combined effect of attractive supports and deterrents in laboratory settings.

Main Results:

• Red-colored artificial estivation supports were found to be the most attractive to the invasive snails.
• Garlic extracts demonstrated the strongest repellent effect, effectively protecting estivation supports and food sources from snails.
• Results were consistent across all four invasive snail species studied.

Conclusions:

• A push-pull strategy utilizing visual (red supports) and chemical (garlic extract) stimuli shows significant potential for managing invasive snails in Australian agriculture.
• This approach effectively diverts snails from crops by manipulating their natural estivation behavior.
• This study represents the first attempt to integrate visual and chemical cues in a push-pull strategy for pest management, offering a novel solution for invasive snail control.