Definitions

Chlorosis:

Yellowing of leaf tissue

Distorted

Pulled or twisted out of shape

Lesion

A region on a leaf, stem, or pod which has suffered damage through injury or disease, such as a wound, ulcer, abscess, or tumor.

Necrosis

Dead tissue which is often brown to black in coloration

Pustule

A small raised spot or rounded swelling

Stippling/Stipled

Dot-like patterns produced on the leaves or flowers of plants

Stem Girdle

An enlarged calloused portion on the stem that can often break off easily

Tip Burn

Dead (brown or black) tissue long the leaf margin