They are not always better. it is dependant upon insect, application site & circumstances. That only describes mode of action. What is important is results & what is actually best for the...
If you mean ladybirds, the red beetle with the black spots, they will be killed by insecticides. They however eat aphids so are beneficial and remove the need for spraying for greenfly.
By serving as bait by which the affected insects are trapped is the way in which pheromones can be used as insecticides. Insecticides are used to control insect populations. Pheromones are excretions...
That just means the active ingredient was derived from nature. Don't assume that means it is automatically safe to use. Pyrethrin is natural but you difinately don't want to spray too much in a...