No insecticide will kill every insect since there are so many variable that can affect its effectiveness - temperature, humidity, proximity of rainfall, nature of leaf surface, droplet size provided by the applicator, stage of maturity of thr pest, to name but a few. There are very few products now available to the amateur gardener so one must make do with what one can get. This is a well tested product and I find that if instructions are followed that one gets acceptable results. If, on occasion, I do have a disappointing result, I do not blame the product but accept that there are so many variables that can affect performance. Insecricides are not some kind od magic medicine. That said, this ranks amongst the best products currently available for amateur use.
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