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... study was carried out on 1 August 2019 in Ouled Hadedj in the eastern part of Mitidja in Algeria (36º45′37, 23″N, 3º28′20, 52″E) ( Fig. 1) as a part of a complete comprehensive survey of the pest Nezara viridula which was conducted between 2018 and 2019. The bugs were collected from tomato crop by hand sampling which was a very useful technique to facilitate and to make sure the recovery of the individuals alive. To study the behaviour of the bug, the individuals (adults ...