The leaf margins curl inwards. Field patches have a very distinctive dull red colour. Some varieties show blackish-brown spots along the veins which are best seen on the underside of the leaf. Very susceptible to manganese deficiency. The older leaves show a strong interveinal yellow mottle whilst the veins themselves remain green.
Older leaves turn yellow in severe cases.
The main symptom of manganese deficiency is a pale green leaf. Older leaves show interveinal yellow-mottling in the severest cases. The main symptom of manganese deficiency is a pale green leaf. Older leaves show interveinal yellow-mottling particularly at the leaf margins. Older leaves show fine interveinal yellow or yellow-white mottling.