Just found another nugget from a link I saw on one of the organics forums:
"C.
Interveinal chlorosis. Interveinal chlorosis first appears on oldest leaves.
1.
Older leaves chlorotic, usually necrotic in late stages.
Chlorosis along leaf margins extending between veins produces a "Christmas tree" pattern. Veins normal green. Leaf margins may curl downward or upward with puckering effect. Necrosis may suddenly occur between veins.
Potassium or
calcium excesscan inhibit uptake of magnesium...
magnesium deficiency
When the external magnesium supply is deficient, interveinal chlorosis of the older leaves is the first symptom because as the magnesium of the chlorophyll is remobilized, the mesophyll cells next to the vascular bundles retain chlorophyll for longer periods than do the parenchyma cells between them. Leaves lose green color at tips and between veins followed by chlorosis or development of brilliant colors, starting with lower leaves and proceeding upwards. The chlorosis/brilliant colors (unmasking of other leaf pigments due to the lack of chlorophyll) may start at the leaf margins or tips and progress inward interveinally producing a "Christmas" tree pattern. Leaves are abnormally thin, plants are brittle and branches have a tendency to curve upward. Twigs are weak, subject to fungus infection, usually leaves drop prematurely; plant may die the following spring.
2.
Smaller veins in older leaves may turn brown. Small necrotic spots in older leaves spread from the margins inwards, and finally desiccate the entire leaf blade. At severe, advanced stages, young leaves also display this spotting...
manganese excess
3.
Chlorotic areas (pale yellow) on
whole plant; leaf edges curl upward...
molybdenum deficiency
General symptoms are similar to those of nitrogen deficiency: Interveinal chlorosis occurring first on the older or midstem leaves, then progressing to the youngest. Sometimes, as in the "whiptail" disease, plants grown on ammonium nitrogen may not become chlorotic, but develop severely twisted young leaves, which eventually die. Other characteristic molybdenum deficiency symptoms include marginal scorching and rolling or cupping of leaves. With molybdenum deficiency, nitrogen deficiency symptoms may developing the presence of adequate levels off nitrate nitrogen in the root environment and high levels of nitrate nitrogen in the plant. Nitrate nitrogen must be reduced in the plant before it can be utilized. Molybdenum is required for this reduction, and if molybdenum is deficient, nitrate may accumulate to a high level in the plant, and at the same time the plant may exhibit nitrogen deficiency symptoms. Molybdenum differs from other trace nutrients in that many plants can develop in its absence provided that ammonium nitrogen is present. Molybdenum appears to be essential for the nitrate-reducing enzyme to function. Molybdenum deficiencies are commonly found in Northeastern Washington.
4.
Foliar marginal necrosis is the most common symptom of fluoride toxicity along with Chlorosis along and between the veins occurs in fluorine-sensitive plants. With many plants, the marginal necrosis is preceded by the appearance of gray or light-green, water-soaked lesions which later turn tan or reddish-brown. Injury generally occurs at the tips of the leaves first, then moves inward and downward until a large part of the leaf is affected...
fluoride excess"
So yep,
@1939bear , looking more like a Mg-def.. Gonna check the pH when I get home, just to make absolutely sure, but the rest of the plant looks great and isn't showing signs of pH swing; just a def...
Anyway, HAPPY HUMP DAY AFN!!!
