Documents about Powdery Mildew

  • 9 Pages

    3 - Copy

    N.C. State, PP 315

    Excerpt: ... PP 315/590J Laboratory 3 Diseases Caused by Fungi - II True Fungi Introduction Phyllum Ascomycota (Ascomycetes) Class Hemiascomycetes: asci without an ascocarp Class Plectomycetes: asci in a closed ascocarp - cleistothecium Objectives of lab 3 1) To become familiar with vegetative and reproductive structures of the Hemiascomycete and Plectomycete classes within Ascomycota, and their role in disease development. 2) To observe symptoms and signs of representative diseases caused by pathogens in the Ascomycota phyllum. Description Ascomycetes, or sac fungi, make up the largest group of fungi, having 50,000 species including yeasts, licens, and truffles. These fungi are about 75% of all known species. Ascomycetes are also responsible for many plant diseases such as Dutch elm disease and powdery mildew s. Vegetative hyphae are septate The ascomycete sexual stage is characterized by the ascocarp fruiting body, which may be absent, closed, disk-shaped, or flask shaped. The ascocarp bears sac-like re ...

  • 2 Pages

    lab_quiz3 - Copy

    N.C. State, PP 315

    Excerpt: ... Lab Quiz #3 Date_ Name_ Section_ 1. (3 pts) List three distinguishing characteristics of fungi in the phylum Ascomycota. Septate vegetative hyphae, Conidia, Ascus. 2. (1 pt) In the Ascomycota, what structure is used to distinguish among classes? Ascocarp 3. (2 pts) Name two diseases caused by pathogens in the Hemiascomycetes. Would you attempt to control these diseases? Why or why not? Peach leaf curl and Oak leaf blister. These diseases can only be prevented before they infect the leaf buds. Control is only effective before the buds open. 4. (1 pt) In the class Plectomycetes, how are the genera distinguished? The genera are distinguished by the host they infect because they are host-specific. 5. (2 pt) What is the role of conidia in epidemics of powdery mildew ? How are they dispersed? Conidia are asexual spores that are polycyclic and function as the secondary inoculums. They are carried by the wind to other hosts. 6. (2 pts) On a dogwood severely infecte ...