Greening: Green outer bulb scales
Disorder Symptoms Formation of chlorophyll in the outer scales due to sunlight, which results in the scales turning green. Causes...
Greening: Green outer bulb scales
Disorder Symptoms Sunlight causes the formation of chlorophyll in the outer scales, which results in the scales turning green. Causes...
Splitting and doubling of bulbs : Cracked and splitted bulb
Disorder Symptoms The symptoms are similar to those of late or excess applications of nitrogen. The basal plate of the onion bursts and...
Splitting and doubling of bulbs : Corky basal end
Disorder Symptom The basal plate of the onion bursts and becomes corky. The symptoms are similar to those of late or excess applications...
Splitting and doubling of bulbs
Disorder Symptoms The first symptom observed is the splitting of the basal plate. Secondary growth of the affected bulb often occurs as...
Bolting: Light and fibrous seed stalk
Disorder Symptoms Under this condition bulbs become light and fibrous and show very poor keeping quality. A seed stalk will form very...
Bolting: Premature seed stalk
Disorder Symptoms When onion crop is grown for bulbs some premature seed stalks are produced before completing the normal life cycle of...
Iris Yellow Spot Virus(IYSV) disease : Green island tissue appearance
Pathogen : Tomato Spotted Wilt Virus (Tospo virus group) Symptoms Green islands of tissue can appear within a necrotic IYSV lesion. These...
Iris Yellow Spot Virus(IYSV) disease : Infected flower stalk
Pathogen: Tomato Spotted Wilt Virus (Tospo virus group) Symptoms First appear as straw-coloured, dry, tan, spindle or diamond-shaped...
Iris Yellow Spot Virus(IYSV) disease : Progression of the infection
Pathogen: Tomato Spotted Wilt Virus (Tospo virus group) Symptoms As the IYSV disease progresses, concentric rings may, or may not, be...