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DIY Garden Bug Spray If you have an issue with bugs eating your plants in the garden, here is a DIY Garden Bug Spray you can try to get rid of the pests. Put 2 cups of onion skins in a container. Add 4 cups of boiling water. Cover and let soak for about 3-4 days. Then remove the onion skins and pour water into a spray bottle. Shake well and spray both sides of the plant leaves.
Natural Pest Repellent-Keep slugs and aphids away from window boxes with a homemade, nonchemical pest spray. Place one peeled onion, two peeled garlic cloves, and one teaspoon cayenne pepper in the jar of a blender. Add three cups of water, and blend until smooth. Let the mixture sit overnight, strain the liquid into a spray bottle, and coat plants generously. The solution will keep, refrigerated in the bottle, for up to one week. from Martha Stewart Living
A tonic for black spot and powdery mildew on roses Roses, while beautiful, are often plagued with black spot or powdery mildew. I mix these ingredients into a tonic, which I spray on my roses: 2 teaspoons of baking soda and 1/2 teaspoon of liquid soap or Murphy's oil soap in 2 quarts of water. The tonic protects the roses for months.
"Aspirin is the remedy for fungal plant problems, Black spot, powdery mildew, and rust are a terrible trio of fungi, which can attack and destroy your plants. Scientists have found that two uncoated aspirin tablets (325 milligrams each) dissolved in 1 quart of water and used as a foliar spray can thwart these diseases."
Mix one teaspoon of liquid dishwashing detergent with one cup of vegetable oil. Shake vigorously to emulsify and add to a quart of tap water. Use at 10-day intervals as an all-purpose spray for white flies, spider mites, aphids, and various insects on carrots, celery, cucumbers, eggplants, peppers, and others. We've used it on evergreens and other ornamentals. Note: Test on a single plant first, because it may cause tip burn. This is a contact insecticide, so spray mix directly on the pest.