Infection

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1. the stage when a pathogen is growing in a susceptible host and causing damage.

cone_infection_new.jpg

Pine cone infection causing damage to the tree branch.
Source: http://www.frap.cdf.ca.gov

cherry-powdery-mildew.JPG

A cherry plant with a powdery mildew infection.
Source: http://plant-disease.ippc.orst.edu