Bt cotton is resistant to pest, such as lepidopteron, dipterans and coleopterans. Is Bt cotton resistant to other pests as well?

Bt cotton is made resistant to only certain specific taxa of pests. It is quite likely that in future, some other pests may infest this Bt cotton plants. It is similar immunisation against small-pox which does not provide immunity agains‎t other pathogens like those that cause cholera, typhoid etc.