Neem oil solution is safe for all garden vegetable and fruit plants. It should be sprayed onto plants with pests every few days and after it rains up until harvest.
Basic recipe: 1 teaspoon Neew oil into 1 quart of water into a spray bottle. If the oil does not go into suspension uniformly after shaking well, add ¼ to ½ teaspoon dishwashing soap (Ecover brand is OK). The neem oil solution breaks down in water over a few days, so make up a fresh mixture for each application.
Natural Need Oil Recipe for Control of Garden Insects