Indian J Med Microbiol Close
 

This photograph shows the second instar larvae 4 hours after exposure to various test and control substances tested; clockwise; negative control (top), 2% betel oil (right upper), 3% betel oil (right lower), 4% betel oil (left lower), asuntol 1% (left upper). All larvae in contact with 4% betel oil were dead by two hours (dark discoloration most prominent in this group)

This photograph shows the second instar larvae 4 hours after
exposure to various test and control substances tested; clockwise; negative control (top), 2% betel oil (right upper), 3% betel oil (right lower), 4% betel oil (left lower), asuntol 1% (left upper). All larvae in contact with 4% betel oil were dead by two hours (dark discoloration most prominent in this group)