Vespa velutina is an invasive hornet that is colonising several countries worldwide, with detrime... more Vespa velutina is an invasive hornet that is colonising several countries worldwide, with detrimental effects on multiple components but primarily affecting honey bees and native insect species. Traps for wasps and hornets are commonly used for trapping V. velutina, both for monitoring and control purposes. In this study, we compared the performances of two typologies of traps and baits widely used for trapping this invasive hornet, by evaluating their effectiveness and selectiveness in trapping V. velutina in two sites during two different periods of the year, spring and autumn. The performance of the traps changed in relation to (i) the trap’s model, (ii) the bait’s typology and (iii) the period of the year. In spring, traps with common beer as bait were more effective and more selective independently of trap’s model than the commercial bait that has been tested. On the contrary, in autumn, just one combination of trap and attractant (the commercial trap and bait) achieved higher ...
Rearing trials on several Bombus species were carried out in 1990 and 1991. The purpose was to im... more Rearing trials on several Bombus species were carried out in 1990 and 1991. The purpose was to improve techniques of colony management and to observe colony growth and the behaviour of foraging workers. A total of 5 queens of Bombus hortorum (L.), 32 of B. humilis Ill., 93 of B. lapidarius (L.), 77 of B. pratorum (L.), 5 of B. ruderatus (F.), and 177 of B. terrestris (L.) were collected in spring on flowering plants. No queen of B. hortorum, but 1 of B. humilis, 1 of B. lapidarius, 11 of B. pratorum, 3 of B. ruderatus, and 33 of B. terrestris started to rear larvae, however, workers emerged only in 1 colony of B. lapidarius, 5 of B. pratorum, 2 of B. ruderatus, and 29 of B. terrestris. In 1990, virgin queens and males coming from B. terrestris artificial nests were placed in mating cages; these queens were then used to found new colonies, that were reared throughout the winter until the completion of their cycle.
Vespa velutina is an invasive hornet that is colonising several countries worldwide, with detrime... more Vespa velutina is an invasive hornet that is colonising several countries worldwide, with detrimental effects on multiple components but primarily affecting honey bees and native insect species. Traps for wasps and hornets are commonly used for trapping V. velutina, both for monitoring and control purposes. In this study, we compared the performances of two typologies of traps and baits widely used for trapping this invasive hornet, by evaluating their effectiveness and selectiveness in trapping V. velutina in two sites during two different periods of the year, spring and autumn. The performance of the traps changed in relation to (i) the trap’s model, (ii) the bait’s typology and (iii) the period of the year. In spring, traps with common beer as bait were more effective and more selective independently of trap’s model than the commercial bait that has been tested. On the contrary, in autumn, just one combination of trap and attractant (the commercial trap and bait) achieved higher ...
Rearing trials on several Bombus species were carried out in 1990 and 1991. The purpose was to im... more Rearing trials on several Bombus species were carried out in 1990 and 1991. The purpose was to improve techniques of colony management and to observe colony growth and the behaviour of foraging workers. A total of 5 queens of Bombus hortorum (L.), 32 of B. humilis Ill., 93 of B. lapidarius (L.), 77 of B. pratorum (L.), 5 of B. ruderatus (F.), and 177 of B. terrestris (L.) were collected in spring on flowering plants. No queen of B. hortorum, but 1 of B. humilis, 1 of B. lapidarius, 11 of B. pratorum, 3 of B. ruderatus, and 33 of B. terrestris started to rear larvae, however, workers emerged only in 1 colony of B. lapidarius, 5 of B. pratorum, 2 of B. ruderatus, and 29 of B. terrestris. In 1990, virgin queens and males coming from B. terrestris artificial nests were placed in mating cages; these queens were then used to found new colonies, that were reared throughout the winter until the completion of their cycle.
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