Pest identification
What's eating my argentine giant cactus?
Mealybugs / Cochineal scale
Signs: Bright red or white powdery deposits on the ribs and areoles; crushed insects leave a crimson stain.
Control: Blast off with a strong water jet outdoors; treat with neem oil or insecticidal soap spray; repeat every 7–10 days.
Aphids
Signs: Clusters of soft insects at new growth buds or flowering tips; distorted or sticky tissue.
Control: Knock off with water spray; apply insecticidal soap solution and repeat as needed until clear.
Spider mites
Signs: Fine webbing and dusty stippling on the stem in hot, dry indoor or greenhouse conditions.
Control: Increase humidity, wipe the stem with a damp cloth, and apply neem oil or miticide spray weekly.
Keep argentine giant cactus pest-free
Healthy plants resist pests best. Get the basics right:
Argentine Giant Cactus pests — FAQ
What is eating my argentine giant cactus?
Argentine Giant Cactus (Echinopsis candicans) grows large and is often kept outdoors in warm, dry climates. Outdoors it can attract cochineal scale, aphids at new growth tips, and occasional grasshoppers. When grown as a houseplant it faces the usual mealybug and spider mite threats. Its thick ribs and heavy spines make thorough inspection challenging.
How do I get rid of mealybugs / cochineal scale on argentine giant cactus?
Bright red or white powdery deposits on the ribs and areoles; crushed insects leave a crimson stain. Blast off with a strong water jet outdoors; treat with neem oil or insecticidal soap spray; repeat every 7–10 days.
How do I get rid of aphids on argentine giant cactus?
Clusters of soft insects at new growth buds or flowering tips; distorted or sticky tissue. Knock off with water spray; apply insecticidal soap solution and repeat as needed until clear.
How do I get rid of spider mites on argentine giant cactus?
Fine webbing and dusty stippling on the stem in hot, dry indoor or greenhouse conditions. Increase humidity, wipe the stem with a damp cloth, and apply neem oil or miticide spray weekly.