Superficial seedling
Mineral deficiency
Bright light
Soil crusting
Inadequate seedbed
Tassel ear
temperature difference (day/night)
Physiological disorder
Inadequate ventilation
Cuticule cracking (rain check)
Black speck
Guttation
Boron (B) deficiency
Autogenic necrosis
Vein streaking
Brown bud
Black midrib
Chimera
Translucent scale
Low relative humidity