Imidacloprid is not mobile enough in the plant. Takes too long to go up. It might work as a preventative, however dinotefuran + a knockdown spray is how I do mine. The knockdown spray includes oil and an IGR. Most insecticides save for organophosphates are useless against Asian Cycad Scale.
They who can give up essential liberty to obtain a little temporary safety, deserve neither liberty nor safety.
Benjamin Franklin 1775
Sell not virtue to purchase wealth, nor Liberty to purchase power.
Benjamin Franklin Poor Richard's Almanac1738