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. Most species show interveinal yellow of the older leaves which begins at the leaf margins and gradually extends to towards the midrib leaving a band of green along the vein.