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PPPodcast1 - PPPodcast Week 1 Welcome to the Plants...

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PPPodcast: Week 1 Welcome to the Plants, Pathogens, and People Podcasts! Each weekly podcast will review a major concept or issue, will clarify a possible point of confusion, and will provide study hints. If you have a comment or suggestion, please email or talk to us! Let’s start with this week’s Major Concept which is the plant disease triangle. The plant disease triangle is a diagrammatic representation of the three fundamental elements required for disease: a susceptible plant, a pathogen capable of causing disease, and a favorable environment. If any of these three elements is missing, no disease occurs. Let’s begin with the plant. Many factors influence a plant’s susceptibility to disease, including its growth stage, its genetic makeup, and stress. These same factors also influence diseases in animals, including people. Symptoms are the expression of disease by a plant in response to the activities of the pathogen. Symptoms may be localized, such as spots on leaves, or systemic, such as blighting of the entire plant. Symptoms can involve necrosis, or death, of part or all of
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