Effects of Temperature and Relative Humidity on Sporangium Production ofPseudoperonospora humulion Hop

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Abstract
The effects of night temperature and relative humidity (RH) on sporangium production of P. humuli on systemically infected hop shoots were studied. Sporangium production was inhibited or was very light in hop yards when either the nightly minimum temperature was .ltoreq. 5.degree. C, or the mean RH [relative humidity] at night was .ltoreq. 64%. Production of sporangia increased with increases of nightly minimum temperature, nightly mean RH and temperature, and number of hours which RH was .gtoreq. 80%. Multiple regression analysis with minimum nightly temperature .times. hours with RH .gtoreq. 80%, and nightly mean RH as independent variables accounted for 84% of the variation in sporangium production.

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