I found the site I was looking at - it was in my search to figure out why cotton isn't grown here anymore. This sentence got me,
"Control of the root knot nematode is important to managing Fusarium wilt caused by most genotypes (races 1, 3, and 8) of the causal fungus." HMM! 8?
http://ipm.ucanr.edu/PMG/r114100311.html