| Summary: | The generalist mirid predator <i>Macrolophus basicornis</i> may contribute to Integrated Pest Management (IPM) of <i>Bemisia tabaci</i> in tomato crops. It is important to know the compatibility of the chemicals used to control this pest with this promising biological control agent. Seven insecticides were tested to investigate their toxicity to the predator. For four of the products, the LC<sub>50</sub> for adults were determined. Buprofezin, cyantraniliprole and spiromesifen did not cause lethality and were classified as harmless. Acetamiprid, bifenthrin, etofenprox + acetamiprid and pyriproxyfen + acetamiprid caused acute toxicity and were classified as harmful. LT<sub>50</sub> for all harmful insecticides were relatively low, ranging from 1.8 to 3.2 days. Moreover, these four insecticides have low LC<sub>50</sub>, with acetamiprid (0.26 mg a.i. L<sup>−1</sup>) as the lowest, followed by bifenthrin (0.38 mg a.i. L<sup>−1</sup>), etofenprox + acetamiprid (4.80 mg a.i. L<sup>−1</sup>) and pyriproxyfen + acetamiprid (8.71 mg a.i. L<sup>−1</sup>). However, the calculated risk quotient (RQ) values demonstrated that these insecticides were mostly ecologically safe for this predator, except for acetamiprid, classified as slightly to moderately toxic. The present study can contribute to the use of <i>M. basicornis</i> as a biological control agent on tomato crops and to compatible use with the insecticides tested, according to IPM strategies.
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