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Hi Marc,
Its often not a good thing to use sprays. Phosphates are very deadly to birds (ducks) where as pyrethrins are deadly to fish and aquatic life.
Both ranges of chemicals are used in insecticides.
Some phosphous compounds are used in agriculture controlling fruit pests. They are available from produce stores for the public.
The concentrate, straight out of the bottle is so toxic to birds that one drop, 1cc, can kill up to 2,000 pigeons. The LD50 is 240ugms/Kg.
Farmers spray it on fruit. There is a with-holding period before they are allowed to harvest. The chemical breaks down to harmless H2O, CO2, etc.
That is only while the fruit is still attached to the tree. It does not breakdown if the fruit is harvested before the end of the withholding period.
Most of the Mortein and Rid type of products are pyrethrins. Quite dangerous to the fish.
We all need to be aware of what the affects are on wildlife when we spray. Googling helps. Have a look at the active constituents.
Cheers
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