Abstract. At the bird's – foot trefoil crop one of the most important aspects is the production of seed, so for the realisation of an integrated protection of a superior quality seed and in a great quantity, is necessary to know the insects that produce the most important damages to this crop. One of these insects is the bird's – foot trefoil thrips ( Odontothrips loti Hal.). The weather conditions during the last two years were favorable to the growth of the Odontothrips loti Hal. populations in the western part of Romania (Timis County). The purpose of this research was to test some insecticides used for controlling the seed Lotus corniculatus thrips in soil and climatic condition from Didactical Station of U.S.A.M.V.B. Timisoara. In this paper we try to draw attention to this pest which is of real importance in case of seed leguminous plants production. For realizing the chemical treatments in the years 2009 and 2010, the experimental field was placed at S.D. Timişoara. The experimental field was formed from 3 repetitions, each repetition having 7 variants. The usage of pesticides was the same in the all two years of the experimentation, as follows: V 1 – treated with Fastac 10 EC; V 2 - treated with Mospilan 20 SP; V 3 - treated with Calypso 480 SC; V 4 - treated with Confidor 70 WG; V 5 - treated with Actellic 50 EC; V 6 - treated with Decis 2,5 EC;  V 7 – untreated testifier. In the year 2009 the most efficient product in controlling the bird's – foot trefoil thrips is the Fastac 10 EC product, which had an efficiency coeficient of 69,88% and the lowest results were obtained after the usage of Mospilan 20 SP product, with an efficiency coeficient, it was of 60,93%. In the year 2010 the best results were obtained after the usage of same product Fastac 10 EC, which had an efficiency coeficient of 76,48%, and the lowest results were obtained after the usage of Mospilan 20 SP product, with an efficiency coeficient of 62,61%. The knowledge of the treatments warning is essential in the establishment of the Odontothrips loti optimum control moments.

insecticides; bird´s – foot trefoil thrips; control

Presentation: oral