22 MASS. EXPERIMENT STATION BULLETIN 350 



the mean minimum inside and outside temperatures converge to a narrow differ- 

 ence of less than 5° F.; and when the highest mean maximum relative humidity 

 of 94-100% for the year prevails. The influence of high temperature on leaf 

 transpiration and infection is recognized. The severity of the disease is related 

 fundamentally to temperature. 



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