larvacide of some sort will do you good... some things work faster than others.
Bti is an option. not sure what is in cannacure off the top of my head. This may take bit to have a major impact.
could spray properly diluted pyrethrine on top of soil.. that will kill on contact.
since you are so close to harvest, what you spray on plant (more importantly the well-develped buds) is a bit limited.