Infection
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1. the stage when a pathogen is growing in a susceptible host and causing damage.
Pine cone infection causing damage to the tree branch.
Source: http://www.frap.cdf.ca.gov/pitch_canker/identification/cone_infection.html
A cherry plant with a powdery mildew infection.
Source: http://plant-disease.ippc.orst.edu/disease.cfm?RecordID=291