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QPlant protectionI spray against the same problem, but the product no longer works well. What should I do?
Do not increase the dose on your own. First check that the cause was correctly identified, that the treatment was on time and that the sprayer worked evenly. The weather and the condition of the plants also affect the result.
The pest may also have become resistant. Changing the trade name does not help if the products have the same mode of action. Review the products you have used with an agronomist, and include rotation of modes of action and other control measures. Use every product only in line with its authorised use and its label.
Source: UC IPM (University of California). Material: Brochure 2, "Preventing the development of resistant forms".