It is caused by that near borders of the lodged (damaged, weakened) area are located stalks not damaged in such an extent, and in other circumstances would remain standing okay.
Ni Husababishwa na mipaka Hiyo karibu ya kulala `atakuwa (kuharibiwa, dhaifu) eneo mabua iko si kuharibiwa katika KIWANGO kavu, na katika hali nyingine ingekuwa bado wamesimama sawa.