Please read my research paper entitled Effect of resistance inducers on in vitro inhibition of mycelial growth and sporulation of Fusarium solani causing root rot of fenugreek by Ramteke PK weblink http://plantpathologyquarantine.org/
First, prepare your fungal inoculum in solid agar medium or liquid medium.
and then harvest your spore by filtering (to sperate the spores from hyphal freagments) the culture liquid medium or scrap the fungal surface colony with the spreader (from solid agar medium). your spore suspension then ready to calculate your sporea using haemacytometer