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.
Bacillus thuringiensis (Bt) is a bacteria that produces proteins which are toxic to insects. Btâs extreme toxicity comes at no surprise. Itâs in the same family of bacteria as B. anthracis, which causes anthrax, and B. cereus, which causes food poisoning.esearch has shown that the Bt toxin persists in the gastrointestinal tract of human-flora-associated rats weeks after exposure. Research has shown that Bt has a toxic effect on the lungs and other organs. In rare cases, Bt can even wreak havoc on the eyes, causing severe irritation and even blindness.