Spidermite SMC+ Overview Advice SMC+ is a broader spectrum pest control product developed to target multiple pests rather than just spider mites. Developed to safely control: Spidermites Greenfly Blackfly Whitefly Thunderfly Easy to use, simply make up a solution in a sprayer and mist both sides of the affected plant leaves – avoiding the flowers. This product is ideal to use as a weekly preventative spray. Instructions for use: Mix 25 ml of product with 1 litre of water, mix well. Spray both sides of the leaves of the affected plant. Avoid spraying the flowers.