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The present study deals with the connection of geomagnetic (Disturbance Storm Time Dst) and light trap catches of some beetle species from Hungary, Tasmania, and Nebraska. Most of the examined species on all three continents were members of the Scarabaeidae family. The light source used was krypton in Hungary, mercury. vapor light in Tasmania and black light in Nebraska. For each species, a relationship was found between the values of geomagnetic Disturbance Storm Time (Dst) and the number of beetles captured. However, the results were not identical. Four types were identified: increasing catching type, decreasing catching type, and increasing then. decreasing catching type, and decreasing then increasing catching type.

The study deals the efficiency of light trapping of the Common Cockchafer (Melolonthamelolontha L.) (Coleoptera: Melolonthidae) in connection with the ozone concentration of air. Thedata of the Hungarian forestry light trap network were used for the years 1997 through 2006. Wecalculated relative catch values of from the number of caught insects. We assigned these to the ozonevalues of the respective days. For the classified date pairs regression equations were calculated. Weestablished that the light trapping is most effective if the ozone concentration is high. As opposed tothis, low ozone concentration reduces the success of the catch. Our results may be utilized in plantprotection and forest protection prognoses.

Light trap catches of the winter moth (Operophtera brumata L.) getting from the data ofnational light-trap network were analysed in connection with weather fronts. It is concluded, thatweather fronts modify the catches of light traps according to their specific characters (main types) andaccording to their successions. It is worthy of attention, however, that even in those cases in which thefront reduces the number of insects caught, pre- and post-frontal influences often manifest themselvesin an increase of the number of collected specimens. Because of the frequency of weather fronts itwould be useful to take their effects into consideration on the quantity of insects captured at lighttraps.It is necessary to improve the applied method for this purpose.

The Hungarian Forest Research Institute operated a Jermy-type light-trap in the Kámon Botanic Garden, Szombathely (47°15'20"N; 16°36'25"E) between 1962 and 1970. As the insects are poikilotherm creatures, therefore it is understandable; their body temperature is always the same as the temperature of the environment. It can be assumed, therefore, the temperature ranges, can ​​influence the flight activity of nocturnal Macrolepidoptera individuals and species, so we made this investigation. Different species are swarming in various aspects and the temperature is also different. Therefore, we processed separately the captured data of species and individuals in spring-, early- and late summer-, and autumn aspects, in connection with daily minimum temperature. The results were plotted and the correlations and their level of significance were determined. Our results demonstrate that all aspects on low temperature minima both the number of caught species and individuals are low. In contrast, a higher minimum value ​​of specimens was taken and the rising number of those species is caught. The relationship is linear or exponential function characterized.

For a long time, researchers have compared light traps operating with different light sources. According to the results, ultraviolet lights often performed better than visible light sources. In the present study, we examine the wingspan of macrolepidoptera species in relation to the catch result of visible (visible) and BL traps in choice and no-choice situations using data from the Hungarian light-trap network. We used the catch data of 19 light-trap stations from 1962 to 1963. Up to 18 stations belonged to the national network and the last one was in Nagytétény. We processed data of 381 species of the 18 light-traps data of the national network and data of 222 species from the light traps of Nagytétény. The data of the wingspan of the different macrolepidoptera species we collected from the websites of UKmoths (http://ukmoths.org.uk/index.php), and Guide to the Butterflies and Moths of Hungary (macrolepidoptera) (http://www.macrolepidoptera.hu). We summarised for each light-trap station and each trap type the number of the macrolepidopteran species and individuals caught from different generations. Then, using the Mann–Whitney test, we checked for species the number of individuals captured by visible and BL traps, and the difference of the level of significance. We summarised the wingspan data of all the 381 species, the more efficient light source for each species in a no-choice situation at multiple sites and for the single site of Nagytétény the more efficient light source for species detected there. The BL trap seems most efficient for operation for plant protecting purposes, despite the fact that their use is far more problematic. Insect species are not only endangered by light trapping but also by the light pollution of urban areas. Our results confirm that the different light sources should incur mortality on different species to differing levels. Such differential mortality from artificial light sources could disturb the balance of life in biological communities.