Abstract
Onion leaves were inoculated with conidia of Stemphylium vesicarium. Conidial germination, appressorial formation and penetration of the leaf surface were studied. Several germ-tubes developed from each conidium and grew in any direction across the leaf surface. Terminal (29·7%) or intercalary (18·8%) appressoria were formed above epidermal cells. Of these appressoria, 72·3 and 47·7%, respectively, successfully penetrated epidermal cells. Single, terminal (35·9%) and double (12·5%) appressoria formed above stomata and 96·5 and 89·4% of these appressoria, respectively, successfully penetrated the leaf via stomata. Occasionally compound appressoria were formed above stomata (3·1%) with 100% successful penetration. Penetration of the leaf surface, whether directly through the epidermis or via stomata, only occurred after the formation of appressoria.
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