Soybean Yellow Mosaic Virus (YMV)
Symptoms, Whitefly Vector & Chemical Spray Guide
Complete pathology and integrated management of Yellow Mosaic Disease in soybean. Identify early transmission symptoms, calculate exact CIBRC chemical dosages per 15-litre knapsack pump, and protect yield from up to 80% loss.
Understanding the Whitefly-Virus Transmission Cycle
YMV cannot be controlled by ordinary fungicides. It is a viral pathogen vectored strictly by whiteflies.
Pathogen Profile
Causal Organism: Mungbean yellow mosaic India virus (MYMIV), a ssDNA Begomovirus family pathogen that disrupts chlorophyll synthesis and arrests pod filling.
Insect Vector
Vector: Whitefly (Bemisia tabaci). A single female whitefly can acquire the virus in 15 minutes of feeding and transmit it to 20+ healthy plants within hours.
Economic Damage
Infection within 30 days of germination causes up to 80% to 100% complete seed loss, barren pods, shriveled beans, and severe plant stunting.
Approved Chemical Sprays & Dosage per 15-Litre Pump
Calibrated for knapsack backpack sprayers using 150 to 200 litres of water per acre.
| Chemical Active Ingredient | Mode of Action | Dosage per Acre | Dose per 15L Pump |
|---|---|---|---|
| Thiamethoxam 25% WGBrand: Actara, Syngenta | Systemic neonicotinoid (Quick uptake) | 100 gm / Acre | 5 – 6 gm |
| Acetamiprid 20% SPBrand: Manik, Pride | Systemic translaminar (Sucking pest specialist) | 50 gm / Acre | 4 – 5 gm |
| Diafenthiuron 50% WPBrand: Pegasus, Syngenta | Inhibits ATP synthesis (Nymph + Adult knock-down) | 250 gm / Acre | 18 – 20 gm |
| Pyriproxyfen 10% + Bifenthrin 10% ECDual Action IGR + Pyrethroid | Insect Growth Regulator (Sterilizes eggs) | 200 ml / Acre | 18 – 20 ml |
| Pro-Tip: Always add 5 ml silicon-based non-ionic sticker / spreader per 15L pump to ensure rainfast adhesion during monsoon drizzle. | |||
4-Pillar Integrated Pest Management (IPM) for Long-Term Control
Thiamethoxam 30% FS @ 3 ml / kg seed
Treating certified seed prior to sowing provides systemic protection from whitefly vectors for the first 25 to 30 days after germination.
Install 15 to 20 Traps / Acre
Erect bright yellow sticky boards at 1 foot above crop height. Traps mass-catch migrating whiteflies before they establish on plant undersides.
Early Eradication of Primary Foci
Scout fields weekly. Manually uproot early infected plants showing bright yellow patches, place them in plastic bags, and bury them outside the farm.
Sow JS 20-34, NRC 138 or NRC 142
Avoid sowing highly susceptible older cultivars (like JS 335) in high-humidity belts. Resistant lines have thick trichomes that inhibit whitefly feeding.
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