Definition
Flagging is the drooping of leaves on a stem or the death of individual branches with dead leaves still attached.
Discussion
Although flagging may indicate a problem with water relations (drought, for example), it may cause more damage to irrigate a flagging plant if the roots are rotting.
Factors associated with flagging:
1) Root-knot nematodes
2) Drought
3) Flooding
4) Vascular wilt diseases
5) Root rot