Development of an Advisory System for Grapevine Powdery Mildew in Eastern North America: A Reassessment of Epidemic Progress

Fig. 4. Ontogenic resistance could potentially alter epidemic fate. Schematic of potential powdery mildew epidemic outcomes in relation to the timing of arrival of primary inoculum and the development of ontogenic resistance in grape clusters. In grapes, a substantial delay in inoculum arrival could allow the fruit to escape infection.



Image from Plant Health Progress article:
Development of an Advisory System for Grapevine Powdery Mildew in Eastern North America: A Reassessment of Epidemic Progress