Editing Soybean rust (section)

===The process===
The infection process starts when urediniospores germinate to produce a single [[germ tube]] that grows across the leaf surface, until an [[appressorium]] forms. Appressoria form over [[Anticline|anticlinal]] walls or over the center of [[Epidermis (botany)|epidermal]] cells, but rarely over [[stoma]]ta. Penetration of epidermal cells is by direct penetration through the cuticle by an appressorial peg. When appressoria form over stomata, the [[hypha]]e penetrate one of the guard cells rather than entering the leaf through the stomatal opening. This rust and related species are unique in their ability to directly penetrate the epidermis; most rust pathogens enter the leaf through stomatal openings and penetrate cells once inside the leaf. The direct penetration of the epidermal cells and the non-specific induction of appressoria in the infection process of ''P. pachyrhizi'' may aid in understanding the broad host range of the pathogen and may have consequences in the development of resistant cultivars.<ref name="soybeanrust.org" />

Uredinia can develop 5 to 8 days after infection by urediniospores. The first urediniospores can be produced as early as 9 days after infection, and spore production can continue for up to 3 weeks. Uredinia may develop for up to 4 weeks after a single inoculation, and secondary uredinia will arise on the margins of the initial infections for an additional 8 weeks. Thus, from an initial infection, there could be first generation pustules that maintain sporulation for up to 15 weeks. Even under dry conditions this extended sporulation capacity allows the pathogen to persist and remain a threat. If conditions for re-infection are sporadic throughout the season, significant inoculum potential still remains from the initial infection to reestablish an epidemic. Successful infection is dependent on the availability of moisture on plant surfaces. At least 6 hours of free moisture is needed for infection with maximum infections occurring with 10 to 12 hours of free moisture. Temperatures between {{convert|15 and 28|C|F}} are ideal for infection.<ref name="soybeanrust.org" />