Ecological factors limiting epidemics of hop downy mildew in arid climates

R. M. Sonoda and J. M. Ogawa

Hilgardia, 1972, vol. 41, issue 15

Abstract: This study reports on factors affecting the development of hop downy mildew during the dry, hot season in the Sacramento Valley, as well as on factors contributing to the paucity of disease development in apparently favorable conditions. In flood-irrigated commercial hop yards, systemically infected shoots (which can be sources of inoculum) were present until late in the growing season. Dew and guttation fluid appeared on leaves and stems at the base of the plants after irrigation, but only a few lesions developed on the leaves.

Keywords: Environmental; Economics; and; Policy (search for similar items in EconPapers)
Date: 1972
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Persistent link: https://EconPapers.repec.org/RePEc:ags:hilgar:381823

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