problem with basil wilting

Question

hi

all of a sudden my basil (sweet basil) plants suddenly wilt and shrivel. starting from the top. no bugs anywhere, at least not on leaves. soil is fresh from large bags. problem is only in one container. i grow the basil on the roof in NYC and gets good sun, water.
had just put in agri-fos, a safe fungicide and never any trouble before. other pots have same mulch, soil, water, agr-fos, etc but are healthy.

normally fungus would take a while to affect plants. stem turns brown and plant slowly dies. this is first time the plant quickly wilted without any signs. wilting starts at upper leaves and droop over. stem curves down. bottom leaves healthy but soon wilt. only one section of one pot has trouble so far. all other plants are fine.
i gave all the plants another agri-fos spray. i also sprayed when there was no problems which should have prevented any fungus. so this is a mystery.
when i pulled a wilting plant up the main root was nice and long. didnt see any bugs.

thanks

louis
[e-mail]

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Answer 1

This is likely caused by Fusarium Wilt.

This link explains this disease.

https://www.gardeningknowhow.com/edible/herbs/basil/basil-diseases.htm