I have a new situation: Two farmers had different pests attacking their plants. John had a big aphid problem, so he used all the methods available to get rid of them.  Mike had a slug problem, but had almost no aphides.  But I can use this background: Insecticide control of aphids is difficult, as they breed rapidly, so even small areas missed may enable the population to recover promptly. Aphids may occupy the undersides of leaves where spray misses them, while systemic insecticides do not move satisfactorily into flower petals. Finally, some aphid species are resistant to common insecticide classes including carbamates, organophosphates, and pyrethroids.For small backyard infestations, spraying plants thoroughly with a strong water jet every few days may be sufficient protection. An insecticidal soap solution can be an effective household remedy to control aphids, but it only kills aphids on contact and has no residual effect. Soap spray may damage plants, especially at higher concentrations or at temperatures above 32 °C (90 °F); some plant species are sensitive to soap sprays.  What is an answer for this question: Which farmer didn't learn that aphids are resistant to organophosphates?
The answer to this question is:
Mike