1. Frost/freeze injury
ice crystals forming inside the cell walls causing the cell to explode
the plant ofton becomes disfigured in the leafs, blooms, and some times the steams

2. Iron deficiency (chlorotic) color between veins began to die
leaves become yellowish to white

3. Leaf Scorch (drought/ winter burn)
caused by transplanting, soil compaction, nearby excavation, a nutrient deficiency, chemical injury, unfavorable weather conditions (such as drought), poor soil, or limited room for root growth

4. Chemical Damage
Chemical injury is recognized by the curling, twisting or other distortions of the shoots and leaves.
Plants usually will grow back to their normal state unless a heavy herbicide dose has caused severe dieback.

5. Sucking Insect Damage
remove cell contents or sap and thereby weaken the plants.
aphids, leafhoppers, scales

6. Nitrogen Deficiency
occur when woody material such as sawdust is added to the soil
Soil organisms will utilise any nitrogen in order to break this down,
making it temporarily unavailable to growing plants.
Cold weather, especially early in the season, can also cause a temporary shortage.

7. 2,4-d injury cause injury to neighboring cotton
causes of 2,4-D injury are: vapor drift, spray drift and sprayer contamination.

8. Chewing Insect Damage
eat plant tissue such as leaves, flowers, buds, and twigs
often seen by uneven or broken margins on the leaves, skeletonization of the leaves, and leaf mining
beetle adults or larvae, caterpillars, etc.

9. Disease Damage rapid and general killing of leaves, flowers or stems
A dead area on a stem surrounded by living tissue
Yellowing of normally green tissue due to partial failure of chlorophyll to develop
A localized spot of diseased tissue
Whitish or grayish coating of fungal strands
Decayed or decaying tissue caused by microorganism activity.

10. Mechanical Damage
stems or roots have been broken or girdled or if the leaves have been bruised, punctured

11. Disease and insect identification

12. Rust

13. Wilt

14. Gall

15. Hairy Root

16. Spider Mite