en.m.wikipedia.org/wiki/Pyrethrin
Aquatic habitats : In aquatic settings, toxicity to pyrethrin fluctuates, increasing with rising temperatures, water, and acidity. Run-off after application has become a concern for sediment-dwelling aquatic organisms because pyrethroids can accumulate in these areas.[32] Aquatic life is extremely susceptible to pyrethrin toxicity,
Bees: Pyrethrins are applied broadly as non-specific insecticides. Bees have been shown to be particularly sensitive to pyrethrin, with fatal doses as small as 0.02 micrograms.[35] Due to this sensitivity and pollinator decline, it is recommended that pyrethrins be applied at night in order to avoid typical pollinating hours, and in liquid rather than dust form.
Please please in this rainy season be careful of applying any toxin, biocide, etc that can wash into streams, ponds, wetlands, etc. Please be especially careful of neem oil.
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