Albugo_WhiteRust_Easy_Presentation.pptxsX

Albugo_WhiteRust_Easy_Presentation.pptxsX

1. Albugo and White Rust of Crucifers Easy Explanation with Details

2. Classification • Kingdom: Straminopila • Phylum (Division): Mastigomycota • Class: Oomycetes • Order: Peronosporales • Family: Albuginaceae • Genus: Albugo Albugo is a type of fungus-like organism that belongs to the group Oomycetes. It includes many species found all over the world.

3. Introduction Albugo causes a plant disease known as White Rust. It mostly affects members of the mustard family (Crucifers), such as radish, cabbage, cauliflower, and turnip. The disease is called 'White Rust' because it produces white, powdery spots on the plant. These spots are made up of fungal spores.

4. Symptoms of White Rust • The fungus attacks almost all parts of the plant except the root. • White or light-colored raised spots appear on leaves, stems, and flowers. • The lower side of leaves shows white powdery patches called pustules. • These pustules may join together and cover large areas of the leaf. • Infected leaves become thick, curled, and deformed. • Flowers and buds swell, and petals lose their natural color. • The disease reduces crop yield and affects the quality of vegetables.

5. Structure of Albugo • The body of Albugo is made up of thin, thread-like parts called hyphae. • These hyphae join together to form a network known as mycelium. • The mycelium is branched, unseptate (without cross walls), and coenocytic (contains many nuclei in one cell). • It grows between the plant cells and sends small projections called haustoria inside plant cells to take food. • The fungus stores food as oil drops or glycogen.

6. Reproduction in Albugo Albugo reproduces in two main ways: 1. **Asexual Reproduction:** • The fungus produces sporangia (spore cases) just below the plant’s surface. • These break through the surface forming white pustules. • Each sporangium can release tiny zoospores that swim in water and infect new plant parts. 2. **Sexual Reproduction:** • Involves two special structures: oogonium (female) and antheridium (male). • They fuse together to form an oospore (thick-walled resting spore). • The oospore helps the fungus survive unfavorable conditions and grows into a new fungus when conditions improve.

7. Effects and Control Measures • White Rust can cause serious loss in mustard, cabbage, and other crucifer crops. • It reduces both quality and quantity of yield. **Control Measures:** • Use disease-free seeds and resistant varieties. • Avoid waterlogging and overcrowded planting. • Rotate crops and avoid planting crucifers in the same soil every season. • Spray suitable fungicides if infection appears early.

8. Summary • Albugo is a fungus-like organism causing White Rust disease in cruciferous plants. • It forms white pustules on leaves and stems. • Mycelium is coenocytic and grows between plant cells. • Reproduction occurs both sexually and asexually. • The disease reduces crop yield but can be controlled by good agricultural practices.