Management of Fusarium wilt Disease in Cotton Crop

The blog is related to Fusarium wilt disease in Cotton crops. Discover the devastating effects of Fusarium wilt on cotton crops. Learn about the disease's symptoms, causes, and effective control measures, including organic, biological, and chemical methods. Protect your cotton fields from this harmful fungal infection with expert advice.

What is Cotton Fusarium wilt?

Fusarium wilt, caused by the fungal pathogen *Fusarium oxysporium f. sp. vasinfectum (FOV) *, is a significant disease affecting cotton production worldwide. Its sneaky nature and potential for severe yield losses make it a major concern for cotton growers. Fusarium wilt can cause severe symptoms in susceptible cotton varieties. The cotton wilt disease is especially evident on warm days and causes yellowing and necrosis of lower leaf margins. In cotton plants affected by Fusarium wilt, the vascular system in the infected tissue shows a brown discoloration, most noticeable in the lower stem and upper taproot. This discoloration begins in the taproot, spreads into the stem, and is typically continuous, unlike the discontinuous spotted pattern seen in Verticillium wilt.

Short Description of Fusarium Wilt

Type of Infestation	Disease
Common Name	Fusarium Wilt
Scientific Name	Fusarium oxysporum f.sp. vasinfectum
Category of Plant Disease	Fungal Disease
Mode of spread	Soil, wind, water, seed
Affected parts of plant	Roots, Stem, Leaves, Bolls

Favorable Factors for Fusarium Wilt Disease in Cotton:

• Warm temperatures: The fungus grows in warm soil temperatures, with optimal range for growth and sporulation between 24°C and 30°C.

• Neutral to slightly acidic soil: Fusarium oxysporum prefers soil pH between 6.5 and 7.5. Alkaline or acidic conditions can suppress its growth, but these may not be ideal for cotton either.

• High soil moisture: While overwatering isn't directly beneficial for the fungus, moist soil facilitates spore germination and root infection. 

Cotton Fusarium Wilt chemical control:

Chemical control is one of the methods used to manage this disease, though it is often combined with other cultural and biological practices for effective management. Fusarium wilt in cotton can be controlled by effective seed treatment, foliar spray or soil drenching.

Products	Technical Names	Dosage
Coc50	Copper oxychloride 50 wp	2gm/l
KTM	Thiophanate Methyl 70 WP	250-600 grams per acre
Hattrick	Trichoderma harzianum 1 WP	Dissolve 100 grams of formulation in 10 liters of water and dip the roots of seedlings for 30-45 min before transplanting.
K ZEB	Mancozeb 75 WP	500gm per Acre

Initial Symptoms of Fusarium Wilt in Cotton 

• Seedling stage:
• Uneven stands due to poor germination or seedling death.
• Brown vascular discoloration in the base of the hypocotyl, visible in cross-section.
• Vegetative stage:

• Slight yellowing and chlorosis on the edges of older leaves, starting from the lower canopy.
• Wilting during hot days, particularly on wilted leaves, which recover at night.

Severe Symptoms of Fusarium Wilt in Cotton:

• Severe wilting and drooping of leaves, progressing upwards over time.
• Leaf necrosis: Leaves turn brown and dry, eventually dropping prematurely.
• Extensive brown vascular discoloration throughout the stem, visible in cross-section.
• Stunted bolls: Affected plants produce significantly smaller bolls or fail to set bolls altogether.
• Plant death: In severe cases, the entire plant can wilt and die prematurely.

Cotton Fusarium Wilt cultural control:

• After conducting deep plowing in the summer, clear and burn any infected plant debris left in the soil.
• Farm yard manure or other organic manures @ 4 t/ac should be applied.
• Follow mixed cropping with non-host plants to reduce the soil temperature by providing shade.

Fusarium Wilt in Cotton FAQS

Q. How do you treat Fusarium wilt of cotton?

A: Katyayani COC50 is the best chemical fungicide for Fusarium wilt in Cotton. Remove and burn the infected plant in the soil after deep summer ploughing.

Q.What is the cause of the wilt of cotton?

A: Fusarium wilt of cotton, caused by Fusarium oxysporum f. sp. vasinfectum (FOV), is a disease that depends on the amount of the fungus present. There are six types of this fungus and many variations.

Q. What are the symptoms of Fusarium wilt?

A. Yellowing and browning of cotyledons, followed by browning of the petiole. Loss of firmness, yellowing, drooping, and wilting of leaves. Darkening or blackening of vascular tissues. Infected plants become stunted and produce fewer bolls.

Q. What chemical is used to control Fusarium wilt?

A. synthetic fungicides are widely used to control wilt diseases. Katyayani Coc 50 and Katyayani Samarth are the two best fungicide for control of Fusarium wilt.