The pesticide is not without controversy. It is a systemic poison which means that when it is sprayed on plants, the plants take it up into their cells and become poisonous. Those animals that are without backbones – shrimp, bees – are extremely sensitive to the neurotoxin. However it can damage fish which are slightly affected by it, birds which are vulnerable to it and humans exposed can develop troubling symptoms.
The spraying of mud flats will be a novel use of the pesticide. In the past the pesticide carbaryl was used to control shrimp numbers. It is now banned. The oyster growers have tried to control the shrimp numbers by dynamiting their burrows and in another failed attempt, spread a thin layer of cement on top of their burrows. The idea was to suffocate them but the creatures made new holes before the cement hardened.
Washington State Dept. of Ecology
National Pesticide Information Center(Oregon State University)
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