Cover photograph (Copyright © 2006, American Society for Microbiology. All Rights Reserved.): Tomato root and attached soil particles colonized by hyphae of Fusarium oxysporum f. sp. lycopersici expressing the DsRed2 gene, 4 days after transplantation of a tomato seedling into soil infested with 10⁵ conidia per ml of soil. The image is a superposition of a confocal fluorescent projection onto a light micrograph. (See related article on page 1523.)