Organic Control of Green Beetles on Corn and Potatoes in New Zealand

Two Effective Homemade Sprays

Recipe 1: Garlic-Oil Soap Spray

• 1 head garlic, peeled and pureed
• 2 tbsp mineral/vegetable oil
• 2 cups water
• 1 tbsp dish soap (no bleach)

Steep overnight, strain, add soap, spray on affected plants.

Recipe 2: Baking Soda-Oil Spray

• 1 tbsp vegetable oil
• 2 tbsp baking soda
• 1 tsp dish soap or Murphy Oil Soap
• 2 quarts water

Mix, spray weekly.

Important Caveats

• Sprays kill beneficials too (ladybugs, bees). Apply early morning or late evening.
• Test on a few leaves first.
• Rotate sprays to prevent resistance.

Cultural Practices

Encourage birds, rotate crops, use row covers early season. Healthy plants tolerate more damage.