Jassids feed on the underside of cotton leaves right from the seedling stage, and by the time the classic yellow-triangle burn shows up at the leaf margins, the population has usually already built up across the field. Left unchecked, they stunt growth and cut into how well the plant fills out its squares and bolls, so spraying the right insecticide as soon as they're spotted is what protects the crop.
How to Identify Jassids in the Field
Jassids are small, wedge-shaped, greenish-yellow hoppers that move sideways or hop away quickly when a leaf is disturbed. Both nymphs and adults feed on the underside of the leaf, so turning leaves over is the quickest way to confirm an infestation.
Symptoms to Watch For in the Field
- Reddish-yellow triangular burn at the leaf margins that spreads inward
- Leaves curling downward and turning brittle
- Yellowing and a bronzed look on affected leaves
- Stunted growth in heavily infested patches
- Small, wedge-shaped hoppers visible on the underside of leaves
What Causes Jassid Infestations
- Nymphs and adults feeding on leaf undersides and drawing out sap
- Toxic saliva injected during feeding that damages leaf tissue
- Warm, dry spells favouring rapid population build-up
- Excess nitrogen application, which produces soft growth jassids prefer
- Continuous cotton cropping and weedy field borders carrying populations over between seasons
1. Beta-cyfluthrin 8.49% + Imidacloprid 19.81% w/w OD
Combines a fast-acting synthetic pyrethroid with a systemic neonicotinoid, giving quick knockdown of jassids on contact along with longer systemic protection as the plant takes up the neonicotinoid component.
Product Recommendations
2. Thiamethoxam 12.6% + Lambda-cyhalothrin 9.5% ZC
Combines a systemic neonicotinoid with a fast-acting synthetic pyrethroid, giving quick knockdown of jassids on contact along with longer systemic protection as the plant takes up the neonicotinoid component.
Product Recommendations
3. Fipronil 5% SC
Acts through contact, stomach, and systemic action, disrupting the jassid's nervous system and giving broad coverage against the wider sucking pest complex in the same spray.
Product Recommendations
4. Thiamethoxam 25% WG
A systemic neonicotinoid absorbed quickly into the plant, giving fast knockdown of jassids along with residual protection against the next wave of colonisation.
Product Recommendations
5. Diafenthiuron 50% WP
A thiourea insecticide that's converted into its active form by sunlight after spraying, giving strong contact and stomach action against jassids and the wider whitefly-aphid-thrips complex.
Product Recommendations
Cultural and Mechanical Control Measures
- Avoid excess nitrogen application, which produces soft, tender growth that jassids prefer
- Monitor the crop closely from the seedling stage onward, especially after a flush of new growth
- Keep field borders and bunds free of weeds and alternate hosts where jassids can build up between seasons
- Conserve natural predators by avoiding unnecessary broad-spectrum sprays
- Rotate between different modes of action from one spray to the next to slow the build-up of resistance
Disclaimer: Always confirm current label registration, approved dosage, water volume, and pre-harvest interval (PHI) for your state before using any product, since labels are periodically revised by regulatory authorities.
This guide is a general advisory. Do your own research and verification before using any product. Always confirm suitability for your crop stage, region, and field conditions before making any purchase, spray, or crop-management decision.
