The few times I have had them I use these little fellas..Predatory mites (Amblyseius species) can be obtained from some mail order suppliers of biological controls for release in greenhouses or on house-plants to control thrips
Suppliers of biological controls go
to this link the work really well ............
also Alternative Pesticides
Several alternative pesticides are available for controlling thrips. Sulphur, insecticidal soap, and diatomaceous earth have all demonstrated efficacy in suppressing thrips in several crops. Being contact pesticides, however, their effectiveness in onions would probably be limited, because the thrips can hide between the leaves. In contrast, three applications of superfine sulfur are recommended at monthly intervals in fruit crops for spring thrips control. Lime sulphur has also been suggested as an alternative.
Spray formulations of the biological agent Beauvaria bassiana are also useful for thrips control. The agent is a fungus that grows and reproduces in the host; therefore, effective control may not be observed until 7 to 10 days after application. B. bassiana is most effective when used early, before large thrips populations have built up.
The botanical pesticides garlic, rotenone, ryania, pyrethrum, neem, and nicotine have been suggested for thrips control. Another botanical presticide, sabadilla, also has a record of controlling thrips and is suggested when other botanicals fail. Organic growers should be aware that nicotine and other tobacco-based pesticides are prohibited in organic production. The formulations of many other botanical products are also prohibited, and organic producers are encouraged to consult their certifier before purchasing them.
Noted organic proponent J. Howard Garrett recommends use of a homemade botanical spray formulated from garlic and pepper. Garrett's garlic/pepper tea is made by liquefying two bulbs of garlic and two cayenne or habañero peppers in a blender 1/3 full of water. Solids are strained out, and enough water is added to make one gallon of concentrate. Garrett mixes ¼ cup concentrate with two tablespoons of vegetable oil and enough water to make 1 gallon of ready-to-use spray mix. ( A commercial product called Hot Pepper Wax®, containing capsaicin (the active ingredient of cayenne pepper), is also recommended for thrips control. A highly refined horticultural oil can be used during the growing season for control of thrips and several other insects.
Spinosad may also be useful in controlling thrips in the field. Spinosad is a recently discovered insecticide, derived from the fermentation of Actinomyces bacteria commonly found in the soil.
Organic Standards has recommended that spinosad be allowed in organic production. Organic growers should consult their certifier before using.
Always follow label instructions when using any pesticide, and keep in mind that the decision to use a pesticide should be made only when other approaches to pest management fail to provide adequate crop protection. Again, be aware that some "natural" pesticides may be unacceptable or limited in certified organic production. Check with a certifying agent before purchasing or using any such products.
hope it helps ....
e2a ..... want to watch them this year ..there having a bumper season ..........
e2a spelling