Chemical herbicide needed to fight growing infestation
Carlsbad is preparing to launch an aggressive effort, including the widespread application of a chemical herbicide, to eradicate the invasive plant Ward’s weed from about 200 acres where it has taken root in several of the city’s habitat preserves.
The plant “spreads extraordinarily fast and can grow in dense mats that choke out native plants,” the report states. “Once the infestation reaches a certain point, eradication will be infeasible, and the plant could spread throughout California and the United States.”Another danger is that the plant quickly dries out and becomes highly flammable after its annual spring growth spurt, creating a fire hazard that lasts until the next rainy season.
The plant has seed pods that hang on throughout the dry season and burst open with the first rains, distributing up to 30,000 seeds per square meter. The seeds stick to clothing, muddy boots and the feet of animals to become widely dispersed.Small infestations can be controlled by hand-pulling the weeds. Mowing the plant is ill-advised because it tends to spread the seed.
The City Council in 2017 unanimously approved a policy that opposed the use of chemical pesticides and herbicides in favor of organic alternatives when possible. However, the policy allowed exceptions for infestations such as Ward’s weed.
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