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Weevils Wage War on Invasive Weeds in Panvel Lake
9 May
Summary
- Tiny insects released to eat invasive aquatic weeds at Vadale Lake.
- Vadale Lake is a 400-year-old ecological lung of Panvel.
- Biological control is a sustainable solution for weed management.
In a pioneering ecological effort within the Mumbai Metropolitan Region, the Panvel Municipal Corporation (PMC) has initiated a biological-control campaign. This intervention targets the invasive aquatic weeds that have been overwhelming Vadale Lake, a significant and historic water body in Panvel. The campaign involves releasing cyrtobagous salviniae weevils, specialized insects that feed exclusively on the problematic Salvinia molesta weed.
Vadale Lake, approximately 400 years old and spanning 25 acres, is a vital ecological asset for Panvel, supporting biodiversity and groundwater recharge. The invasive weed had formed dense carpets, reducing oxygen and sunlight, thus endangering fish and bird populations. This new biological method was adopted after environmentalists and citizen groups advocated for sustainable solutions beyond mechanical removal, which proved insufficient due to rapid regrowth.
The project, a collaboration with the Indian Council of Agricultural Research, is expected to show visible results within three to six months. Full clearing of the weed cover, allowing open water to reappear, is anticipated to take 15 to 18 months. Officials anticipate this method will be cost-effective, environmentally safe, and provide a permanent solution to restore the lake's original ecological character.
