Chemical analysis of Bankalmi, Polygonum hydropiper was evaluated against rice hispa beetle. Hot water extracts of Bankalmi (Ipomoea sepiaria) and Bishkatali (Polygonum hydropiper) (1:10; W:V) can efficiently controlled the hispa beetle. Bankalmi leaf extract with 25-95% ethyl alcohol gave 70-100% mortality of rice hispa. However, 95% alcohol itself killed 100% of the test insect population indicating unsuitable for Bankalmi leaf extraction. But it can be extracted with 25-50% ethanol. Hexane itself killed all the insects and was not suitable as solvent to extract Bankalmi active ingredient. Comparing the three methods of leaf extraction (Soxhlet and two crude methods), Soxhlet methods gave higher mortalities of rice hispa beetles than the others.