Rhizomania, also known as root madness or crazy root, is a disease of sugar beet caused by the Beet necrotic yellow vein virus transmitted by the soil-borne fungus Polymyxa betae. It was first discovered in 1950 in Japan and has since spread to many sugar beet growing regions worldwide. The disease causes significant losses in root and sugar yield, with infection in Serbia estimated to have caused losses on over 5,177 hectares. Key symptoms include gridling and darkening of the root system, stunted fleshy roots, and chlorosis in leaf veins. Management strategies focus on cultural practices like early planting, resistant varieties, and soil fumigation to control the vector.
Ecosystem Interactions Class Discussion Presentation in Blue Green Lined Styl...
Rhizomania in Sugar Beet: Causes, Symptoms and Management
1. RHIZOMANIA IN SUGAR BEET
STUDENT
Miss.KOWSALYA.S
ID. No: 2015021064
COURSE TEACHER
Dr. PARTHASARATHY S
Asst. Professor (Plant Pathology)
2. HISTORY
• Rhizomania also called as “root madness” or “crazy
root”
• First discovered in 1950 at Japan
• 1959- discovered in Italy
• Currently virus was found in six Asian countries, 22
European countries and parts of USA
6. SYMPTOMS
ROOTS:
• Gridling of lower part of the root
• Dense and dark root hairs leads to the drying
of roots from white to brown and new rootlets
produced continuously this is called “salt and
pepper beard”
• In severe cases taproot restricted two or three
inches below the soil surface results in a “wine
glass” shape
7. • Vascular system becomes darkened in
longitudinal sections
• Early season infection results in stunted fleshly
roots
• Leaf – chlorosis in leaf veins and necrotic
symptom
• On foliage- chlorosis with erect and upward
posture
10. SYSTEMIC POSITION
• GROUP – Group IV ((+)ssRNA)
• FAMILY – Benyviridae
• GENUS – Benyvirus
• SPECIES – Beet yellow vein virus
11. PATHOGEN
• Beet necrotic yellow vein virus
• Vector- soil borne fungi Polymyxa betae
• It is a obligate parasite
• Vector can survive more than 10 years in the
soil in the form of cystososri
• Virus rigid rod particles with divided genomes
(3-5 molecules of ssRNA)
17. INTEGRATED DISEASES MANAGEMENT
CULTURAL MANAGEMENT :
• Early planting of crops can reduce the
infection of plants
• Use of resistant cultivars can reduces infection
to some extend
• Vector can be controlled by soil fumigation