Question

Which of the following best describes a 'vector' in the context of plant disease transmission, such as the spread of a plant virus from an infected plant to a healthy one in the field?

A The pathogen's own reproductive structure
B A chemical used to treat the disease
C The host plant's resistance gene
D A living organism, such as an insect, that carries and transmits a pathogen from an infected plant to a healthy one
E A type of fungicide spray
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