To disruption of water transport within the plants is necessary very noticeable mechanical or thermal damage, a mere drying or death of plant parts (eg stem) is totally insufficient.
Hii usumbufu wa usafiri maji Ndani ya mimea ni sana liko Muhimu mitambo au mafuta uharibifu, na tu kukausha au kifo cha sehemu za mimea (mf. mia moja) ni kabisa zisizotosha.