S. Mahunka szerk.: Folia Entomologica Hungarica 34/1. (Budapest, 1981)

FOLIA ENTOMOLOGICA HUNGARICA ROVARTANI KÖZLEMÉNYEK XLII (XXXIV). 1. 1981 p. 91 - 93 Thysanoptera species collected by a suction trap in Hungary G. JENSER (Received December 1, 1980) Abstract: Evaluation of the Thysanoptera material captured by a suction trap operated at Keszthely (Hungary). Observation of the mass flight of four species under anticyclonlc conditions was made. Seven thrips species are new to the fauna of Hungary. For the first time in Hungary, a suction trap was operated at Keszthely, in 1965 and 1967. A considerable portion of the collected material consisted of Thysanopterous species. The following results were obtained: The mass flights of Limothrips denticornis Linné, Anaphothrips obscurus (Müller), Frankliniella intonsa Trybom, and Thrips minutissimus Linné were observed. The mass flights were formed - in agreement with the data of LEWIS (1964) - under anticyclonic conditions. Regular, though not mass-type flights oceured with the species Aeolothrips intermedius Bagnall (Aeolothripidae) and with Haplothrips aculeatus (Fabricius) (Phlaeothripidae). A total of seven Thysanoptera species were captured. According to the data of JOHNSON (1950) and TAYLOR (1951), the suction traps designed for collecting small-size, airborne insects and operated in South England, proved to be suitable for capturing thrips species, too. LEWIS (1963, 1964, 1965) studying the characteristics of massflights of thrips species, and especially that of Limothrips cerealium Haliday, by the help of suction traps, provided Indispensable data. For the first time in Hungary, a suction trap was operated for the purpose of collecting air-borne insect species, by Dr. Tibor JERMY, at the Experimental Laboratory of the Research Institute for Plant Protection, at Keszthely, in 1965 and 1967. The' evaluation of the then collected material enabled me to assess the possibilities of suction trapping and to study flight conditions of some thrips species in Hungary. Material and Methods Description of the suction trap: the uppermost point of the suction tunnel (12 cm dlam.) was situated at a height of 6 m. A fan, providing a negative pressure inside a 100x59x59 cm size box, drove some 1000 m

3 air hourly through the tube. The insects sucked in were oriented into a glass container attached to the base of a frustum of cone-shaped plaxtic net of fine mesh. The net and the container were fastened to the lower end of the suction tube inside the box. The insects entering the glass container were preserved in a mixture of alcohol (70% by volume) and glycerine. The collected material was removed daily between 7.00 and 10.00 a.m. The suction trap was installed in the 1 ha orchard of the Experimental Laboratory planted with various fruit-trees. There were also some backyard orchards of mixed varieties in the vicinity. A little farther (1500 to 2000 m away), there were open arable fields and a forest of mixed stand. In 1965, the suction trap was operated from April 21 till September 20, while in 1967, from April 11 till October 10. Climatic data were supplied by the Experimental Laboratory of the Research Institute for Plant Protection, at Keszthely, and by the National Institute of Meteorology, at Budapest.