Dear Michael Ackah,

Pictures are worth 1000 words see the attached photos.

Usually plant pathologist use a general media like potato dextrose agar. Pure cultures of identified strains are commonly employed.

Do a literature search using the term dual culture for more specific details.

good question

Dual culture technique

Using dual culture is one of the best ways to do it. You can use dried filter paper discs impregnated with the bacteria or use a line of bacteria in both sides of fungi. PDA media is good.