Plant Diseases

(a) Mosaic disease of tobacco: In this disease leaves get shrinked and become small. The chlorophyll of leaves get destroyed. The factor of this disease is Tobacco Mosaic Virus (TMV) known as bacteriophage. Control – Affected plants should be burnt.

(b) Bunchy top of banana: This diseases is caused by banana virus. In this disease plants become dwarf and all the leaves get accumulated like a rose on the branch.

(c) Yellow Vein Mosaic of Bhendi: It is a viral disease caused by virus affecting okra plants. This disease is transmitted by insects and white fly.

(a) Wilt of Potato : It is also known as ring disease because brown ring is formed on the xylem. The factor of this disease is Pseudomonas solonacearum bacteria. In this disease the conduction system of the plant is affected.

(b) Black Arm of cotton : The factor of this disease is Xanthomonas Bacteria. In this disease a water soaked round spot (brown) is formed on the leaves.

(c) Bacterial blight of Rice: This disease is caused by Xanthomonas oryzae bacteria. Yellow-greenish spot is seen on both side of leaves. Vascular bundles get blocked due to bacterial growth.

(d) Citrus Canker: The factor of this disease is Xanthomonas citri bacteria. It has originated in China. Leaves, branches, fruits all are affected by this disease.

(e) Tundu disease of wheat: The factors of this disease are Corinobacterium titrici bacteria and Enzuina Titriki Nematode. In this disease lower parts of the leaves are faded and turned yellow.

3. Fungal Diseases: The diseases included in this group are caused by fungi.

Rust of wheat is a disease caused by fungi Puccinia.

Damping off of seedling is caused by fungus Pythium debaryanum.

Red root of sugarcane is caused by fungus colletotrichum falcatum.

Sahu disease of wheat is caused by insect.

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