Pythium Root Rot in Tobacco Greenhouses

TB08 - Tobacco Disease Note No. 8
W. A. Gutierrez and T. A. Melton


Pythium structures

Figure 9.  Sporangia are reproductive structures that produce zoospores.  Sporangia have different shapes depending upon the species. These structures are produced in the water.
Figure 10.  When the sporangium matures, it will form a vesicle where the zoospores will form and be release. Zoospores are motile, they have a small tail (flagellum) they use to swim.
Figure 11.  Pythium oospores (sexual structure) are formed in infected roots and will easily survive until the next season in the crevices of styrofoam trays where infected roots have grown. 
Figure 12.  Pythium oospores are round with a double cell wall.

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Published by North Carolina Cooperative Extension Service
Distributed in furtherance of the Acts of Congress of May 8 and June 30, 1914. Employment and program opportunities are offered to all people regardless of race, color, national origin, sex, age, or disability. North Carolina State University at Raleigh, North Carolina A&T State University, U.S. Department of Agriculture, and local governments cooperating.

Reformatted October 2001 by Plant Disease and Insect Clinic