Even if enough Fe is in the soil, deficiency can occur under the following conditions: poorly drained soil, high Ca, high Mn, high pH, high P, high heavy metals, oxygen deficiency. Deficiency symptoms General: Yellow or white areas on youngest leaves. Older leaves remain green.
Bt corn is a variant of maize that has been genetically altered to express one or more proteins from the bacteria Bacillus thuringiensis. The protein is poisonous to certain insect pests and is widely used in organic gardening. The European corn borer causes about a billion dollars in damage to corn crops each year.
Corn smut is a fungus that grows on young maize. When the corn is in silk kernels become infected. They swell to golf-ball size galls and discolor. Loaded with soluble fiber, the amino acid lysine and the antioxidant anthocyanin, the moist young galls are collected two or three weeks after the corn becomes infected.