Which of the following pathogens is controlled by Fludioxonil?

Fludioxonil is a broad-spectrum fungicide that is particularly effective against a range of fungal pathogens, including the Fusarium species. Fusarium is known to cause various diseases in plants, particularly in seeds and seedlings, leading to significant economic losses in agricultural practices. Fludioxonil works by disrupting specific cellular processes in fungi, which inhibits their growth and reproduction. This mode of action makes it particularly adept at controlling Fusarium infections, making it a valuable tool in seed treatment practices.

In contrast, while Pythium and Phytophthora are also important pathogens, they are managed with different classes of fungicides due to their specific biology and the resistance mechanisms they maintain. Septoria, being a genus of fungi that affects the leaves of various plants, typically falls under the control of different fungicides designed for leaf spot diseases. Thus, the selection of Fludioxonil for Fusarium reflects its targeted efficacy and the importance of managing this particular pathogen in seed treatments.