If the area just inside the green bark is reddish brown, it is fusarium wilt.
From the sacbee.com
Fusarium wilt is a soil-borne fungal disease that will quickly kill younger basil plants.
From the en.wikipedia.org
Fight fusarium wilt by growing resistant plants, rotating crops and destroying diseased plants.
From the kentucky.com
This virulent form of fusarium wilt has wiped out Cavendish in several southeast Asian countries.
From the en.wikipedia.org
Ploetz said researchers also are breeding bananas that resist fusarium wilt, also known as Panama disease.
From the sciencedaily.com
The Liberty potato is highly resistant to nematodes and moderately resistant to insect pests and fusarium wilt, a fungal disease.
From the sciencedaily.com
Besides the name, such as Celebrity or Better Boy, it may show letters such as VF, which means it possesses resistance to verticillium and fusarium wilt diseases.