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Caused by : Alternaria macrospora
It is one of the major bacterial diseases that can be seen in cotton crop. This disease become more severe in 45-60 days old plants. It occurs in all the stages of cotton crop
SYMPTOMS
- We can observe small brown irregular or round spots on the leaves.
![](https://krishibharat.in/wp-content/uploads/df42d05f-7eb9-45b7-a40b-78e2b05f8561.jpg)
- Each spot is surrounded by concentric rings and has a lesion at the centre.
![](https://krishibharat.in/wp-content/uploads/4d3ca0dc-7afc-4ba8-b6ed-b2c367d06578.jpg)
- Few spots coalescen(merge) together and leads to blighted appearance.
![](https://krishibharat.in/wp-content/uploads/326ca343-7e89-4c9f-a9c7-0c6826491c88.jpg)
- The affected leaves become brittle and fall down
- Lesions are also be seen on the stem.
- In severe infestation, we can observe  spots on bracts and bolls too.
![](https://krishibharat.in/wp-content/uploads/b19bb9d8-2e56-4518-824a-f71ac8914ea0.jpg)
- This leads to loss of yield
MANAGEMENT
Use Prioxar @120ml/acre
![](https://krishibharat.in/wp-content/uploads/CompressJPEG.online_500x500-image-16.png)
Seed treatment using Streptocycline before sowing can control this disease
![](https://krishibharat.in/wp-content/uploads/IMG_20220721_173050.jpg)
Spray COC or Mancozeb @ 2kg/ha