fungi.pptx - THE MANAGEMENT OF PLANT DISEASES IN CROPS...

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THE MANAGEMENT OF PLANT DISEASES IN CROPS CAUSED BY FUNGI
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INTRODUCTION Fungi are multicellular filamentous organisms that are usually microscopic , but sometimes form fruiting bodies visible to the naked eye. Fungi typically produce spores that may infest crops , reside on seeds , or remain in the soil . Fungal spores can also serve as a means for long distance spread of these organisms. All parts of the plant may be attacked at various stages of development; the leaves , stems , roots , flowers , and fruits . In many instances, diseases caused by fungi not only result in lower yields , but also reduce the value and quality of the crops and may increase harvesting costs when affected plants lodge.
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INTRODUCTION Fungal diseases are often characterized by blights , scabs , rusts , moldy coatings , mildews , smuts , and rotted tissue. Some examples of common fungal diseases in crops are: 1. Anthracnose 2. Brown rot 3. Club root 4. Blight (early & late blight) 5. Powdery mildew 6. Gray mold 7. Rust
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ANTHRACNOSE Fungi: Colletotrichum spp. Attacks: Stems, leaves, fruits Mode of spreading: Wind, rain, insects, garden tools Symptoms: Dark, water soaked lesions on stems, leaves or fruit. The centers of these lesions often become covered with pink, gelatinous masses of spores. Management: 1. Choose resistant plant varieties which have not been exposed to the disease. 2. Make sure to disinfect all garden tools after use to avoid spreading the disease. 3. Liquid copper sprays and sulfur powders should be applied weekly , starting when foliage begins to develop and continuing throughout the growing season.
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