Fungal Assciations

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Abstract
Rhizoctonia solani, Fusarium solani, and Phoma foveata were chosen for the study of disease caused by these fungi in different combinations in potato tubers. An initial Rhizoctonia infection, when followed by a Fusarium infection, gave an extensive rotting with external pimple-like formations in some cases. This type of rotting could not be brought about by individual infections with either of the two fungi, or jointly by them when Fusarium was inoculated first. Microscopic observations of infected mature and young potato tubers showed that Rhizoctonia grew intracellularly when infected alone, whereas it grew inter- as well as intra-cellularly in the successive double infection. Fusarium formed more haustorium-like structures when inoculated alone that when it followed Rhizoctonia. The length of these structures in the double infection was greater in mature than in young tubers. Atmospheric humidity affected the amount of rotting, the shape and colour of the rot, and the morphology of the fungus in the tissue.

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