Hate thrips! Arg.
Saw in SFGate, simple solution using dish soap (without degreaser)-
insecticidal soap, which you can make at home using standard dish soap, can effectively control many soft-bodied plant pests, including aphids, mealybugs, thrips, whiteflies, spider mites and scales.
Make the Solution
Combine liquid dish soap with water at a ratio of 2 tablespoons per gallon to create a mixture of slightly less than 1 percent soap. Mix together well.
Homemade insecticidal soap doesn't work effectively if the water is too hard. To test whether water from a certain source is acceptable, combine water and soap in the recommended ratio in a clear glass jar and mix it thoroughly. If a scum forms on the surface of the water, the water is too hard and you must treat it or find an alternative source.
Pour the Mixture
Pour the mixture into a garden sprayer or spray bottle if you prepared it in a different container.
Test for Toxicity
Spray the mixture on a small, inconspicuous section of each plant you wish to treat for insects. Monitor that area for any damage for at least 24 hours and ideally for 48 hours. If no damage is apparent, you can proceed to treat the plant more broadly. If injury does occur, dilute the soap mixture further or choose a different, milder soap.
Spray Affected Plants
In the early morning, spray the affected plants thoroughly with the soap mixture, focusing your efforts on parts of the plant where damaging insects are concentrated, like leaf undersides and leaf axils. Remember that the wet soap must come into direct contact with the pests to control them.
Repeat the Application
Repeat the application every four to seven days until the pests are sufficiently controlled.
Use only a mild liquid dish soap that does not contain a degreaser and is not intended for use with a dishwashing machine.
Although an insect-controlling spray made from dish soap is very low in toxicity, it can still irritate the eyes or cause vomiting or other problems if ingested.
Don't apply the soap spray to drought-stressed plants or when temperatures are above 90 degrees Fahrenheit.
Avoid spraying insecticidal soap on fruit trees that are in bloom.
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