Yawancin nau'ikan cututtukan tuber suna haifar da ko dai yanayi ko damuwa na al'ada.
Fari, m hawa da sauka a cikin ƙasa da iska zafin jiki, da defoliation sakamakon ƙanƙara ko kwari sau da yawa haifar da ci gaban malformed tubers.
Knobby Tubers
Damuwar ruwa na iya haifar da asarar rinjaye a wasu nau'ikan, musamman Russet Burbank. Rashin haɓakar ƙananan buds na gefe yana haifar da ƙwanƙwasa tubers.
Rhizoctonia cankers a kan mai tushe yana kara yawan kamuwa da tubers na knobby.
Ƙarshen Tushen Mai Nuna da Ƙarshen Budda Mai Nuna
Tubers yana nuna alamar ƙarshen lahani. Lalacewar ƙarshen tushe mai nuni shine sakamakon rushewar girma a farkon matakan ci gaban tuber.
Ƙarshen ƙarshen toho mai nuni yana tasowa lokacin da aka hana girma tuber a ƙarshen kakar.
Dumbbells
Dumbbell tubers suna da ƙuntatawa tsakanin ƙarshen kara da ƙarshen toho. Rushewar ci gaba a matakin midbulking yana haifar da ci gaban radial mara kyau na tubers.