Many people around the world for centuries have known that seaweeds are an excellent fertilizer. Recently people have been reporting another benefit of using seaweeds in their garden, pest control.
When these reports started rolling in, researchers began experimenting on apple orchards, and so far have some conflicting data. One experiment in Washington found mite populations reduced when seaweed extracts were applied to the apples. However, in Vermont, another team found no difference in mite population but did report a reduction of maggots.
While the research remains inconclusive, many garden enthusiasts swear by it. Some claim that the timing of application is important, depending on where you are geographically and the type of pests you encounter.
Liquid seaweed is a common store item that can be used as fertilizer and pest control.
Further research into the mechanisms of these deterrents is needed. If conclusive, seaweeds could be an excellent organic pesticide for home or industrial use.