बिरुवाका रोग किरा पहिचान गरी सही उपचार विधि अपनाउनुहोस्। ढुसीजन्य, जीवाणुजन्य, भाइरस रोग र किराहरूको जैविक तथा रासायनिक उपचार।
Rapid daytime wilting of entire foliage while leaves remain green; brown vascular ring staining visible when stem is cut crosswise; milky white bacterial streaming in water.
Soil-borne bacteria entering via nematode injuries or root damage; thrives in warm humid waterlogged soils (28-35°C).
Strict 4-year crop rotation with non-solanaceous crops (maize, paddy); raised planting ridges; solarization of nursery beds.
Asymmetric blotchy yellow mottle on leaves; upright chlorotic shoots; small, lopsided green bitter fruits with dark aborted seeds.
Phloem-limited bacterium vectored by the Asian citrus psyllid (Diaphorina citri); infected budwood graftage.
Plant only certified disease-free grafted saplings; establish psyllid-proof nursery screens; isolate orchards.
Asymmetric blotchy mottling on leaves that crosses leaf veins; yellow upright shoots; zinc-deficiency-like veins; small lopsided bitter fruits that fail to color (remain green at base).
Phloem-restricted bacterium vectored by Asian Citrus Psyllid (Diaphorina citri); spread through uncertified infected graft budwood.
Plant only certified disease-free grafted saplings from registered government nurseries; prune and burn infected branches immediately.
Extensive ragged skeletonized holes on young leaves; heavy sawdust-like moist brown frass packed deep inside the leaf whorl; severed growing tips.
Invasive migratory pest across Nepal; rapid multi-generation lifecycle thriving in warm maize planting seasons.
Deep winter tillage to expose pupae to birds; push-pull intercropping with Desmodium; pheromone traps (5/ropani).
Yellowing and wilting of lower leaves progressing upward; pseudostem easily pulls out of the ground with rotten foul-smelling rhizome.
Waterlogging in heavy clay soils during heavy monsoon rains; infected seed rhizomes.
Raised beds (25-30cm high) with good drainage channels; hot water rhizome dip (47°C for 30 mins) before planting.
Ragged window-pane feeding holes in whorl leaves; massive piles of sawdust-like frass (droppings) inside the central whorl; destroyed tassels.
Migratory nocturnal moth laying egg clusters covered in beige scales on leaf surfaces; rapid multi-generation infestation.
Intercropping with pulses (cowpea, soybean); early planting; pheromone traps (FAW lure) for early detection.
Water-soaked irregular pale dark green spots on leaf edges turning rapidly purplish-black; white downy mildew fuzz on underside during cool moist mornings; foul rotting smell.
Cool temperatures (10-20°C) with persistent fog, high humidity (>90%), and continuous winter rain.
Certified seed tubers; wide ridge spacing; prevent leaf wetness; avoid overhead sprinkler irrigation.
Water-soaked brownish irregular leaf lesions rapidly turning black; white downy mildew on lower leaf surface in humid mornings; tuber dry rot.
Continuous foggy damp weather with relative humidity above 90% and temperature 10-20°C in high hills and winter Terai.
Use certified healthy seed tubers (e.g. Kufri Jyoti, Janak Dev); high earthing up to protect tubers; destroy volunteer potato plants.
Spindle-shaped diamond eye lesions with grey centers and dark reddish-brown borders on leaves; neck blast causes rotting and breaking of the panicle.
High nitrogen fertilizer application, cloudy wet weather, and cool night temperatures during tillering and heading.
Seed treatment with Tricyclazole at 2g/kg seed; balanced NPK fertilization without excess urea; clean bund weeding.
Irregular water-soaked greasy greenish-black lesions on leaves and stems. Under humid conditions, delicate white fungal down forms on leaf undersides.
Cool, persistent foggy, wet weather (12-20°C, RH > 90%), common during Nepal monsoon and winter morning fogs in Terai/Mid-Hills.
Grow resistant varieties; provide plastic rain shelters (tunnel farming); drip irrigation to keep foliage dry.
Distinctive V-shaped yellow chlorotic lesions starting at leaf edges with apex pointing along veins; veins turn dark black/brown.
Seed-borne bacteria spreading rapidly in warm, rainy weather via water droplets and infected nursery soils.
Hot-water seed treatment at 50°C for 25 minutes prior to sowing; clean seedbed preparation with raised beds.
Blossom End Rot (BER) in tomato and pepper — dark sunken leathery brown/black area at blossom end of fruit. Tip burn on inner leaves of cabbage and lettuce. Distorted crinkled young leaves with brown margins. Hollow or bitter pit in apple.
Irregular watering causing calcium uptake fluctuations; excessive potassium or ammonium nitrogen fertilizer competing with calcium uptake; high evaporation rates; insufficient calcium in acidic sandy soils.
Maintain consistent soil moisture with mulching and drip irrigation; apply lime to acidic soils (pH < 5.5); avoid excessive potassium or ammonium nitrogen; side-dress with calcium nitrate.
Upward curling of leaves, puckering, reduced leaf size, thickening of veins, and severe stunting with bushy flower drop.
Vectored by whiteflies (Bemisia tabaci) and thrips; proliferates in warm dry sunny weather.
Erect yellow and blue sticky traps; use silver reflective mulch to repel vector insects; barrier cropping with maize or sorghum.
Patches of stunted, yellowing plants ("fairy ring" patterns in field). Roots bear tiny cream/white to golden-brown lemon-shaped cysts (swollen female bodies) visible to naked eye. Severe crop losses in potato and brassicas.
Sedentary endoparasitic nematodes whose females swell into cysts containing hundreds of eggs. Cysts survive in soil for 20+ years without a host. Spread by contaminated soil on equipment and footwear.
Minimum 5-6 year rotation without host crops; plant nematode-resistant potato varieties; strict farm hygiene — clean machinery and footwear before entering fields.
Spindle or diamond-shaped lesions with gray/whitish centers and reddish-brown borders on leaves; dark necrotic rotting at panicle neck (Neck Blast) causing empty chaffy heads.
Excessive nitrogen fertilizer over-dosing; high relative humidity (>90%) with cloudy rainy weather; night dew.
Balanced NPK ratio with split nitrogen top-dressing; resistant varieties (Sabitri, Radha-4, Sukha series); seed treatment.
Characteristic galls (knots) on roots causing swollen, deformed root systems. Above ground: stunted yellow plants with wilting during daytime even when soil moisture is adequate. Severely infected plants fail to produce marketable yield.
Microscopic soil-dwelling roundworms (Meloidogyne spp.) that penetrate root tips and form permanent feeding sites called galls. Spread through contaminated soil, irrigation water, and infected transplants.
Use certified nematode-free transplants; grow resistant varieties (tomato with N-gene); soil solarization for 4-6 weeks using clear plastic mulch during hot dry season; practice 3-year crop rotation with cereals or marigold.
Circular entry holes bored into green and ripening fruits; internal flesh eaten out, filled with droppings, leading to secondary bacterial soft rot.
Moths laying solitary yellow-white eggs on tender leaves and flowers during flowering and fruiting flushes.
Marigold (हजारी फूल) trap cropping (1 row marigold for every 10-15 rows tomato); Helilure pheromone traps.
Severe upward curling and cupping of leaflets; stunted bush-like growth; thickened chlorotic yellow leaf margins; flower drop and zero fruit setting.
Transmitted persistently by Silverleaf Whitefly (Bemisia tabaci); warm dry weather accelerates whitefly propagation.
Fine 40-50 mesh insect-proof netting in nurseries; yellow sticky traps; border barrier maize/sorghum intercrops.
Clusters of tiny soft-bodied green or black insects colonizing leaf undersides and shoot tips; curled wrinkled leaves and sticky black sooty mold.
Rapid reproductive multiplication in mild dry weather; excessive nitrogen fertilizer attracting succulent feeder sap.
Yellow sticky traps placed 30cm above crop canopy; encourage natural predators like ladybird beetles.
Interveinal chlorosis on YOUNG new leaves — leaf tissue between veins turns bright yellow or white while veins remain distinctly green (network pattern). Severe cases: entire young leaves become pale cream-white. Unlike nitrogen deficiency, old leaves remain green.
Iron unavailability despite iron being present in soil — most common in calcareous (alkaline, pH > 7) soils where iron precipitates. Also caused by waterlogging, excessive phosphorus or manganese, or bicarbonate-rich irrigation water.
Maintain soil pH 5.5-6.5 by applying sulfur or organic matter; avoid waterlogging; use drip irrigation with slightly acidified water; grow iron-efficient crop varieties.
Dark brown to black necrotic lesions on roots and tubers. Roots appear rotten and shortened. Plants show nutrient-deficiency-like symptoms due to reduced root uptake capacity; reduced tuber quality in potato.
Migratory endoparasitic nematodes that move in and out of roots creating lesions and secondary fungal/bacterial infections. Favored by light sandy soils and moderate temperatures.
Maintain optimal soil moisture; use healthy certified seed material; fallow field and deep plowing to expose nematodes to sunlight and desiccation.
Uniform light green to pale yellow discoloration (chlorosis) starting systematically on older bottom leaves; stunted slow spindly growth.
Sandy leaching soils, heavy prolonged monsoon rains washing away nitrates; insufficient decomposed compost.
Incorporate 15-20 metric tons/hectare well-decomposed farmyard manure (FYM); green manuring with Dhaincha or Sunnhemp.
Marginal scorch and necrosis (burnt edges) on older leaves; weak stems prone to lodging; uneven fruit ripening with pale coloration.
Low soil potassium reserves, sandy soils with heavy leaching, or high magnesium/calcium imbalance competing with K uptake.
Soil testing; basal incorporation of Muriate of Potash (MOP) or Potassium Sulfate during land preparation.
Superficial white powdery talcum-like fungal coating covering upper leaf surfaces, buds, and young stems; leaves turn yellow and curl.
Warm, dry weather combined with shade and high relative humidity at night.
Plant in full direct sunlight; avoid high nitrogen fertilizer over-application which stimulates susceptible lush growth.
Concentric brown to black target-like rings on older lower leaves. Surrounding tissue turns chlorotic yellow, leading to premature leaf drop.
Fungal spores splashing from moist soil during warm (24-29°C), humid weather or frequent overhead irrigation.
Crop rotation with non-solanaceous crops for 3 years; mulch around base to prevent soil splash; maintain proper plant spacing.
Characteristic purple or reddish-purple coloring on undersides and sometimes upper surfaces of leaves due to anthocyanin accumulation. Stunted growth, delayed maturity, and poor root development. Dark green dull coloration of older leaves before purpling.
Low soil phosphorus levels, cold soil temperatures (phosphorus uptake stops below 10 degrees C), acidic soils (pH < 5) or very alkaline soils (pH > 8) where phosphorus is fixed and unavailable, and compacted soils limiting root growth.
Apply rock phosphate or single super phosphate (SSP) as basal dose before planting; maintain soil pH 6.0-7.0 for optimal phosphorus availability; deep tillage to improve root penetration.
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