Answer: Short of chemically fumigating your soil and killing everything else along with the fusarium, I'm sorry to say there is no guaranteed way of getting rid of fusarium this year. If you are sure it is fusarium that killed your basil, you won't be able to plant it in that plot of ground again for a very long time (some strains of the fungus can live well over a decade). The good news is that fusarium strains are host specific. I know of no strain that attacks squash, although cucumber and watermelons are host to their own strains. This year, plant certified disease-free basil seed, and research with your seed supplier or extension office (ph# 608-266-4271) any resistant varieties, as well. Planting resistant varieties breaks the cycle eventually.Also, moisture management and the use of organic methods, which promote a diverse community of soil life, create a competitive environment that can help check the proliferation of any single organism.
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