Lotus corniculatus has a great capability of autoinsemination, even in the conditions of a long time depasturage. Concurrently, the rusticity assures great qualities to Lotus corniculatus, compared to the other leguminouses such as, the lack of meteorisations production during the consumption under green table shape (Zamfirescu, 1965). The entomofauna knowledge of this crop plants represents one of the most important stagees in obtaining an integrated protection for a production of high quality and large quantity. The purpose of the paper is to establish the main pests of the crop and the sample incidence of the bird's – foot trefoil thrips. For carrying out the investigations the experimental field was placed at the Didactical Station Timisoara, during the period 2008 - 2009. The experimental field for studying the main pest (Lotus corniculatus), damaged by the Lotus corniculatus was placed after the standard method of location of the experiments, in three repetitions every lot having a length of 2 m and a latitude of 1 m. In studying the Lotus corniculatus thrips biology (Odontothrips loti Hal.) the samples collecting was made during a period of 20 days, with o collecting periodicity at every 48 hours. In the year 2008, the highest number of Odontothrips loti Hal. adults was identified in 30 June in the middle period of the observation, being in average of 21,76 insects/sample.The smallest larvae number was collected in the last decade of June month, being in average of 14,54 insects/sample. In the year 2009 the highest number of Odontothrips loti Hal. adults was identified in the first decade of July, being in average of 19,19 insects/sample.The highest larvae number was collected in the first decade of July month, being in average of 14,28 insects/sample.

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Presentation: oral