Figure 5

Disease indices of sugar beets exposed toC. beticola.Plants were infected with conidia of the wild type strains of Ahlburg and Ferrara, with the Ahlburgctb2disruption strain2 - 1,the Ferraractb2disruption strain2-1, and with the ectopic transformants of Ahlburg and Ferrara. The disease severity was rated after 21 days. Plants infected with the ΔCTB2strains of both wild types exhibited no symptoms of infection (disease score 0). The wild type strain Ahlburg and the ectopic transformant Ahlburg showed a disease score of 4. The wild type strain Ferrara and the ectopic transformant Ferrara showed a disease score of 1. Δctb2mutants did not cause lesions.