Pest identification
What's eating my watermelon begonia?
Mealybugs
Signs: Cottony white tufts at stem nodes and leaf axils; sticky honeydew makes surfaces tacky and may encourage sooty mold.
Control: Remove with alcohol-dipped cotton swabs; follow with repeated neem oil or insecticidal soap sprays at 7-day intervals.
Spider mites
Signs: Tiny pale dots across leaf upper surface; leaves may appear dull or bronzed; webbing at stem tips in heavy infestations.
Control: Raise humidity around the plant; spray with insecticidal soap or neem oil and repeat every 5–7 days for 3 weeks.
Fungus gnats
Signs: Larvae tunnel through moist potting mix and damage fine roots, causing sudden wilting despite adequate watering.
Control: Let the topsoil surface dry slightly between waterings; apply Bti (Bacillus thuringiensis israelensis) drench and place sticky yellow traps to catch adults.
Keep watermelon begonia pest-free
Healthy plants resist pests best. Get the basics right:
Watermelon Begonia pests — FAQ
What is eating my watermelon begonia?
Watermelon Begonia (Pellionia repens) is a humidity-loving trailer most troubled by mealybugs, which colonize the soft creeping stems. Spider mites strike in dry conditions, while fungus gnats exploit the consistently moist soil this plant prefers. Check stems and axils at every watering.
How do I get rid of mealybugs on watermelon begonia?
Cottony white tufts at stem nodes and leaf axils; sticky honeydew makes surfaces tacky and may encourage sooty mold. Remove with alcohol-dipped cotton swabs; follow with repeated neem oil or insecticidal soap sprays at 7-day intervals.
How do I get rid of spider mites on watermelon begonia?
Tiny pale dots across leaf upper surface; leaves may appear dull or bronzed; webbing at stem tips in heavy infestations. Raise humidity around the plant; spray with insecticidal soap or neem oil and repeat every 5–7 days for 3 weeks.
How do I get rid of fungus gnats on watermelon begonia?
Larvae tunnel through moist potting mix and damage fine roots, causing sudden wilting despite adequate watering. Let the topsoil surface dry slightly between waterings; apply Bti (Bacillus thuringiensis israelensis) drench and place sticky yellow traps to catch adults.