What is the sexual structure of the apple scab pathogen?

The sexual structure of the apple scab pathogen, which is caused by the fungus Venturia inaequalis, is ascospores. This fungus produces ascospores in a structure called an ascus, which is contained within a fruiting body known as a pseudothecium. The ascospores are released into the environment and are primarily responsible for the spread of the disease in apple orchards.

Understanding the role of ascospores in the life cycle of Venturia inaequalis is important for effective management strategies in agriculture. The timing of ascospores’ release corresponds to favorable weather conditions necessary for infection, thereby guiding the timing of fungicide applications and other control measures.