Streptomyces ipomoeae is the causal agent of Streptomyces soil rot of sweet potato. a disease marked by highly necrotic destruction of adventitious roots. including the development of necrotic lesions on the fleshy storage roots. Streptomyces potato scab pathogens produce a phytotoxin (thaxtomin A) that appears to facilitate their entrance into host plants. https://thecookiecountesses.shop/product-category/gel-color/