We had almost a month dry period prior to rain last week, so my garden was infested with small black flies and some green insects. I sprayed against fungus with my homemade spray. 20 grams of baking soda + 1 liter of milk + around 1 spoon of vegetable oil + 9 liters of water. As someone on TV suggested somewhere, some insects don't like lactose. I sprayed leaves and stems (most of insects was on stem) and their number diminish over night. I don't think they died, just left my plants and gone somewhere else.
You can try this, it wont hurt.
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“He who plants a garden plants happiness.” Chinese proverb
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