I see in my ealier post I did'nt add enough on the Potassium def. after reading the book, it sounds very close to what I see in pictures.

(k)Potassium starved plants initially appear healthy.
Deficient plants are susceptable to disease.
symptoms include the following:
older leaves(first tips and margins,followed by whole leaves) develop spots,turn dark yellow and die.
Stems often become weak and sometimes brittle.
Potassium is usually present in the soil,but is locked in by high salinity.
First,leach the toxic salt out ot the soil and apply a complete n-p-k fertilizer.
potassium deficiency causes the internal temperature of the foilage to climb(heat) andthe protein cells to burn or degrade.
evaporation is normally highest on leaf edges,and thats where the burning takes place.

Progression at a glance
plants appear healthy with dark green foilage.
leaves loose their luster.
branching may increase,but the branches are weak and scrawny.
leaf margins turn grey and progress to a RUSTY-BROWN color,and then curl up and dry.
Yellowing of the older leaves is accompanied by RUST-COLORED blotches!!


toxicity
occurs ocasionally and is difficult to diagnose because it is mixed with the deficiency symptoms of other nutients.
Too much potassium impairs and slows the absorption of magnesium,manganese, and sometimes zinc and iron.
look for signs of toxic-potassium buildup when symptoms of (mg) (mn) (zn) (fe) deficiencies appear.

looks like it might be this one? potassium deficiency caused by ?? nutelockup?? I'm a noobi dont know much I just qouted from the book cause I wanted to help in someway, gonna read the mg def know