repetition, spray that stuff about 5 times 3 days apart, just like you would neem or spinosad. neither of them kills the eggs either. you have to wait for them to hatch out, and try to catch them before they can lay more eggs. so spraying at least three times, three days apart is the minimum, i usually spray 5 times just to make sure i catch them all.
ah ok....also found this:
Spider Mite Varieties
There are several kinds of spider mites, many of which belong to the Tetranychus genus and are known by alternative names. Red spider mites, for instance, are simply called red spiders or clover mites. Other names for common spider mites that target plants include twospotted spider mite, strawberry spider mite and Pacific spider mite.
Herbs
Chinese parsley (Coriandrum sativum) is an annual culinary herb, and a companion to dill, anise, carraway and potatoes, that repels spider mites. A deterrent spray can also be made from an infusion, or strong tea, of the leaves. Most people know this plant as cilantro, a name that specifically refers to the leaf. The seed, however, is known as the spice coriander. Another annual herb said to repel spider mites is dill, which is considered an excellent companion plant to cabbage and lettuce. Certain herbs in the allium family -- garlic (Allium sativum) and chives (Allium schoenoprasum) -- reputedly benefit a variety of plants and vegetables and specifically protect tomatoes from red spiders. Garlic and chives are perennials in U.S. Department of Agriculture plant hardiness zones 3 through 8 and USDA zones 3 through 10, respectively.
Flowers
Chrysanthemum (Dendranthema grandiflorum) is a generic term for a variety of perennial flowers collectively referred to as mums, most of which are hardy in USDA zones 5 through 9. As the source of the natural insecticide pyrethrum, mums are good companions for a variety of other plants, because they deter several common pests, including spider mites. Shasta daisy (Leucanthemum x superbum), a perennial ground cover and border plant suitable for USDA zones 4 through 10, attracts beneficial species that feed on spider mites, such as pirate bugs and predatory mites.
Vegetables
As botanical cousins to garlic and chives, onion (Allium cepa) and leek (Allium ampeloprasum porrum) also benefit a variety of other vegetables and ornamental plants while deterring red spider mites. Leek is hardy in USDA zones 7 and warmer, while onion, depending on the species and cultivar, is grown as an ornamental and a vegetable in USDA zones 3 through 9. Rhubarb (Rheum rhabarbarum), suitable for USDA zones 3 through 8, deters red spider mites and is beneficial to broccoli, cabbage and other cruciferous vegetables.
http://homeguides.sfgate.com/companion-planting-defeat-spider-mites-73748.html
interesting read