What's eating my roselle?

Roselle grown as an edible crop attracts aphids, whitefly, caterpillars, and cotton stainer bugs. Aphids are the most persistent, clustering on new growth. Caterpillars chew leaves and developing calyces. Use row covers when seedlings are young, hand-remove caterpillars, and apply neem oil for aphids and whitefly.

Colonies on shoot tips and undersides of young leaves cause curled, yellowing growth, sticky honeydew, and sooty mold; can reduce calyx yield if allowed to build up. Knock off with a strong water jet and follow with insecticidal soap or neem oil every 4–5 days. For edible crops, neem oil (azadirachtin) is food-safe when applied per label. Encourage parasitic wasps.

Adults flee from disturbed leaves in a white cloud; nymphs drain sap from undersides causing yellowing and reducing the vigor needed to produce large calyces. Use yellow sticky traps to monitor. Spray leaf undersides with insecticidal soap or food-grade neem oil every 5–7 days. Remove heavily infested leaves and dispose — do not compost.

Irregular holes chewed through leaves and occasional damage to developing calyces; frass (dark droppings) visible near feeding sites. Hand-remove caterpillars and destroy. Spray Bacillus thuringiensis (Bt) on leaves at dusk — effective on young caterpillars, safe for humans and pollinators. Repeat every 7–10 days during moth season.

Red-and-black piercing bugs stab developing seeds and calyces, leaving brown-stained tissue and reducing harvestable yield; most common in warm climates. Handpick adults and nymphs into soapy water. Keep the area around plants clear of debris where bugs shelter. Spinosad spray is effective if populations are high.