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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.
Answer
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.
What else can I help you with?
Do insecticides kill humans?
Some insecticides are just as toxic to humans as they are to insects. Typically, it just takes a larger exposure to affect a human. However, some insecticides can be toxic even in small quantities. Insecticides such as malathion or diazinon would be harmful to humans in much smaller quantities than insecticides derived from soaps or orange peels.
Is common better than rare?
Rare by far
What's the blood to systemic arteries?
There is more blood in the systemic circuit than the pulmonary circuit. Even the arterial portion of the systemic circuit is larger than the entire pulmonary circuit, because the pulmonary circuit only delivers blood to the lungs, and the systemic circuit supplies the rest of the body.
Which of the two paths of blood circulation is shorter?
The pulmonary circulation (from heart to lungs and back) is shorter than the systemic circulation (from heart to body tissues and back).
What animals was killed by insecticides other than mosquitoes?
Other than mosquitoes, there are flies, rats, and any small insect
How wise people are better than strong people?
Because they have a common sence
What does severe systemic disease mean?
A systemic disease effects more than one part of the body. A severe systemic disease is spread throughout the body and impacts the patient's life to a large degree, causing widespread pain and suffering.
What are the recommended vaccinations and parasite control for cattle?
Go talk to your vet. Recommended vaccines and insecticides for your livestock depend on where you live and what stock you have. For instance, you will need different insecticides for Brahman cattle than you would for Angus cattle.
Is a common anode better then a common cathode?
Neither one is "better" than the other, it simply means the circuit will have a different layout/components if you choose one over the other.
How is normal cotton production harmful to the environment?
it uses more insecticides than any other crop that is grown
Why is supermarkets etc better than church?
my frnd..! common sense.. just u need...!
What is the most common prejuduce?
That people like ourselves are better than people not like ourselves.
