What is an ideal pesticide?

# safe for use. non toxic to either humans, mammels or fish # non residual- preferably biodgradable and or UV degradable # selective in its effect # works in multiple kill mods making it hard to develop ressistence to # cheap # non phytotoxic # easy for use # possibly a biological agent which can live in the area even if there are no pests at the time (for example by being a saprofite) but prefers them if they are there. # any many more....