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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 situation considerring all factors.

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A systemic insecticide works from within the sap of the plant so lasts longer than a contact insecticide that only kills the insects on the plant at the time.

A systemic insecticide does not affect the predators of the sap suckers.

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15y ago

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