Azolla, biogas, pesticides are having tremendous economic potential & has emerged as one of the rapidly-growing sectors.

They have wide applications in the areas of
Agriculture
Healthcare
Environment, etc

Here I am suggesting you some topics:

-The antlion as a bio pesticide

-Use of microorganisms as pesticide

-Comparative study of pesticides & bio-pesticides

-Finding novel pesticide from natural sources

-Use of Biogas for power generation

-Studying toxicity of pesticide in different environments

-Strain improvement of Azolla for making edible food products

-Use of Azolla as biofertilizer

-Applications of Azolla mass on green house effect