Garden sprayers are very useful tools for the garden, hand - operated sprayers are most commonly used by individuals for their own relatively small pest problems. However, the commercial applicator will often find it convenient and efficient to have Triggers sprayers for small jobs that do not require larger powered equipment or that require only a small amount of spray. They are also used for small jobs in hard - to - get - at areas where the spray equipment must be carried in. Garden Trigger sprayers use compressed air to force the spray liquid through a nozzle these sprayers may be available for use with single nozzle systems the capacity of garden sprayers 500ml. Neem oil kills insects at all stages of development egg, larvae, and adult. When the neem oil is sprayed on the insects, it prevents the bug from transforming into its next stage. Mix 2 to 3ml of neem oil into 500ml of water and spray on the plants. If the infection is severe rePeat the spray once or twice at a week interval. Hand Operated sprayer for spraying water and pesticides with 500 ml of capacity made with superior quality plastic.