1 Growth and tillering nearly normal, reddish-brown spots or orange discoloration on tips of older leaves Growth and tillering retarded, many leaves discolored 5 Growth and tillering nearly normal, older leaves reddish-brown, purple, or orange-yellow 3 0 Growth and tillering nearly normal Almost all plants dead or dying 9 scale_of attribute variable_of Growth and tillering ceases, most leaves discolored or dead 7 method_of entity acronym iron injury scale