Abstract
The infamous oomycete Phytophthora infestans has been a persistent threat to potato and tomato production worldwide, causing the diseases known as late blight. This pathogen has proved to be remarkably adept at overcoming control strategies including host-based resistance and fungicides. This review describes the features of P. infestans that make it such a daunting challenge to agriculture. These include a stealthy lifestyle that helps P. infestans evade plant defenses, effectors that suppress host defenses and promote susceptibility, profuse sporulation with a short latent period that enables rapid dissemination, and a genome structure that promotes the adaptive evolution of P. infestans by fostering genetic diversity. Nevertheless, there is reason to be optimistic that accumulated knowledge about the biology of P. infestans and its hosts will lead to improved management of late blight.
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