Relationship of airborne spore load ofPyrenophora teresand weather variables to net blotch development on barley

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Abstract
The airborne spore load of P. teres was measured above a barley canopy and related to weather variables. leaf wetness and development and progression of net blotch. The release of conidia followed a diurnal periodicity with peak spore release occurring between 0900 and 1600 h. Spore release was positively related to temperature and negatively related to relative humidity and to leaf wetness. Significant spore loads were present only when the canopy was dry or nearly dry. Also, major spore-release episodes occurred 2-5 days after a 16-h or longer period of leaf wetness, depending on temperature. The cumulative spore total was closely related to the percentage of net blotch, in that the cumulative spore total followed the disease progression after a lag phase.