Abstract
Fifty-two of 59 isolates of Alternaria solani from tomato (Lycopersicon esculentum) were light-dependent for sporulation in pure culture (effective wavelengths shorter than 360 nm), whereas seven isolates (approximately 12%) were light-independent. Tomato cv. Earlypak No. 7 was grown without fungicides during the 1984-1985 and 1985-1986 crop seasons in an experimental greenhouse covered with an ultraviolet-absorbing (UVA)-vinyl film (lower limit of transmission at 385 nm) and in a control greenhouse covered with a common agricultural (CA)-vinyl film (lower limit of transmission at 290 nm) (...)
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