Controlling Aphids (Tela) in Wheat Crop

Identifying Aphids (Tela) and Damage

Recognizing aphids early is crucial for timely control. Look for:

• Small, soft-bodied insects: Often found in colonies on the underside of leaves, on stems, or inside the leaf sheaths and developing ears. They are typically 1-3 mm long.

• Yellowing and curling leaves: Infested leaves may turn yellow, curl downwards, or show stunted growth.

• Honeydew and sooty mould: A sticky, shiny substance (honeydew) on leaves and stems, which can then be covered by black, sooty mould.

• Ant activity: Ants are often attracted to honeydew and can be seen on infested plants.

• Reduced plant vigour: Overall weak and unhealthy appearance of the wheat plants.

Cultural and Biological Control Methods

These methods help prevent severe infestations and promote natural pest control:

• Early Sowing: Sowing wheat at the recommended time can help plants develop resistance before major aphid populations build up.

• Balanced Fertilization: Avoid excessive nitrogen fertilizer, as it can make plants more attractive to aphids. Use balanced NPK application.

• Weed Management: Remove weeds from and around the field, as they can host aphids and other pests.

• Encourage Natural Enemies: Protect beneficial insects like ladybird beetles, lacewings, and hoverfly larvae, which prey on aphids. Avoid broad-spectrum insecticides that harm these natural predators.

• Resistant Varieties: If available, choose wheat varieties known to have some resistance or tolerance to aphid infestations.

Chemical Control Measures

Chemical control should be considered when aphid populations reach economic threshold levels (ETL), meaning the pest density is high enough to cause economic damage if left untreated. For wheat, an ETL is often considered to be when 5-10 aphids are present per ear or 20-25% of plants are infested during the tillering to flowering stages.

Active IngredientDosage (per acre)RemarksImidacloprid 17.8% SL50-70 mlSystemic insecticide, effective against sucking pests.Thiamethoxam 25% WG40-50 gmSystemic insecticide, good residual action.Acetamiprid 20% SP40-50 gmSystemic insecticide, effective at lower temperatures.Dimethoate 30% EC250-300 mlContact and systemic action.

Important: Always read the label of the insecticide carefully for precise dosage, application method, and safety precautions. Rotate different classes of insecticides to prevent resistance development. Consult your local agricultural extension officer for specific recommendations for your region. Apply sprays in the evening or early morning to minimize harm to beneficial insects.

Best Practices for Effective Control

• Regular Monitoring: Inspect your wheat field regularly, especially from tillering to grain filling stages, to detect aphid infestations early.

• Integrated Pest Management (IPM): Combine cultural, biological, and chemical methods for sustainable and effective control.

• Spot Treatment: If infestations are localized, consider spot spraying only the affected areas to reduce overall pesticide use.

• Proper Spraying Technique: Ensure thorough coverage of plants, especially the undersides of leaves and developing ears, where aphids tend to hide.

• Safety First: Always wear protective clothing (gloves, mask, goggles) when handling and spraying pesticides. Dispose of empty containers safely.

Controlling aphids (Tela) in wheat requires a proactive and integrated approach. By regularly monitoring your crop, adopting good cultural practices, encouraging natural enemies, and using chemicals judiciously when necessary, you can protect your wheat yield and ensure a healthy harvest.