KAU Agri Infotech Portal

Onion (Allium cepa L.)

Basal rot (Fusarium oxysporum f.sp. cepae)

Symptoms

Initially yellowing of leaves and stunted growth of plant are observed and later on, the leaves dry from tip downwards.
In early stage of infection, the roots of the plants become pink in colour and rotting take place later.
In advanced stage, the bulb starts decaying from lower ends and ultimately whole plant die.

Management

Soil solarization by spreading polythene sheet of 250 guage in summer season for 30 days reduces the infectious propagules, which in turn reduces the disease.
Follow crop rotation for 4-5 years with non-host crop.
Mixed cropping with tobacco and sorghum is effective in reducing pathogen inoculum and the disease.
Follow proper drainage practices.
Deep summer ploughing.
Avoid injury during cultural practices.
Flood the soil in the non-growing season for basal rot control.
Use resistant varieties

Chemical Control

Sl.No	Generic Name	Trade Name	Color code	Dosage/litre	Knapsack Sprayer (Capacity 10L)	Recommendation		Remarks
Sl.No	Generic Name	Trade Name	Color code	Dosage/litre	Knapsack Sprayer (Capacity 10L)	Dosage/acre (200 L)	Dosage/hectare (500 L)	Remarks
1	Carbendazim 50 WP	Bavistin, Benfil, Bengard, Benlate, Benmain, Bensaan, Carben, Carziim50, Dhanustin, Dhanustin 50 WP, Fungiguard, Gancarzin50, Glizim, Mintho, Tagstin, Tiara, Zoom	Green	2 g/ litre of water/kg of seed	-	-	-	Seed treatment
2	Mancozeb 75 WP	Devidayal M-45, Dhanuka M 45, Dhanuka M-45, Dithane, Dithane M-45, Hilthane, Hindustan M 45, Indofil M 45, Izeb M-45 Manzate, Luzen-45, Macoban, Macoban M-45, Mancosaan, Mancosaan M-45, Maneb Manzane, M-Guard, Savour M 45, Tata M-45 Eurofil-NT, Uthane M-45, Veera, Zinthane	Green	4 g/ litre of water/kg of seed	-	-	-	Seed treatment
3	Thiram 75 WS	Hexathir, Tagithram, Thiram 75 DS, Thiride, Vegfru Thiram	Blue	4 gm/kg of seed	-	-	-	Seed treatment
4	Copper hydroxide 77 WP	HiDice, Kocide 101	Blue	1 g/ litre of water	10 g	200 g	500 g	-
5	Copper oxychloride 50 WP	Bensaan, Blitox, Blue copper, Bluetrox, Copter, Cupramar, Cuprina, Dhanucop, Fytolan, Fytox, Fytran, Fytolan, Hilcopper, Killex copper, Maincop Dhanucop, Star cop, Tagcop, Trucop	Blue	2 g/ litre of water	20 g	400 g	1000 g	-
6	Mancozeb 75 WP	Devidayal M-45, Dhanuka M 45, Dhanuka M-45, Dithane, Dithane M-45, Hilthane, Hindustan M 45, Indofil M 45, Izeb M-45 Manzate, Luzen-45, Macoban, Macoban M-45, Mancosaan, Mancosaan M-45, Maneb Manzane, M-Guard, Savour M 45, Tata M-45 Eurofil-NT, Uthane M-45, Veera, Zinthane	Green	3 g/ litre of water	30 g	600 g	1500 g	-
7	Carbendazim 50 WP	Bavistin, Benfil, Bengard, Benlate, Benmain, Bensaan, Carben, Carziim50, Dhanustin, Dhanustin 50 WP, Fungiguard, Gancarzin50, Glizim, Mintho, Tagstin, Tiara, Zoom	Green	1 g/ litre of water	10 g	200 g	500 g	-