How To Stop Worms From Your Ugu Plants (Pumpkin Leaves) Farm Effectively

You need to spray chemical. Buy caterpillar force from chemical store near you, and spray on them. They will start doing well again. 

Or

Spray ashes on the leaves, then apply chemical. Spray the ashes on the leaves while you apply the chicken dung at the root base. Remember, while using the chicken dung, apply water make it look like tea for quick action.

As a matter of fact, decomposer manure should be used and not directly in contact to the roots.