wow very hard question! The homoptera can be different mechanism to growth regulator, for example, Aleyrodidae can growth regulate across interactions with ants, therefore, presence or absence in this case change the regulator.
the genera Cicada and other similar genera, has the growth regulator accordin to environmental conditions.
So the question is difficult because there are several response as a function of group homoptera.
The question was asked because most focusing insecticide molecules under development by various companies are belonging to IGR group. Hence Knowledge on mechanism of resistance to IGRs will have greater impact for future prospective to understand and manage resistance for IGRs.
An IGR could be a JHA, ecdysone inhibitor, mimics of ecdy-steroids and chitin inhibitor etc. Each group has it different mode in the most of the cases you can expect an elevated hydrolysis or esterase activity