What kind of techniques are used to find out the antibacterial activity of fumes or smokes (produced by crushed and burned plant material with crude plant extract)?
You can use different techniques (qualitative methods and quantitative methods) to check antibacterial activity. However, the most frequently used one is agar diffusion (qualitative) and agar/broth dilution (quantitative) methods. You can find the detail in the attached articles. Good Luck!
To test for volatile antibiotic activity you can either use a split petri dish or an inverted petri plate plate with your extract not coming into contact with the test organism.