Host recognition and use in female parasitoids strongly relies on host fidelity, a plastic behavior which can significantly restrict the host preferences of parasitoids, thus reducing the gene flow between parasitoid populations attacking different insect hosts. However, the effect of migrant males on the genetic differentiation of populations has been frequently ignored in parasitoids, despite...

The desirability relation was introduced by Isbell (1958) to qualitatively compare the a priori influence of voters in a simple game. In this paper, we extend this desirability relation to simple games with coalition structure. In these games, players organize themselves into a priori disjoint coalitions. It appears that the desirability relation defined in this paper is a complete preorder in ...

Many fungal root symbionts of the genus Trichoderma are well-known for their beneficial effects on agronomic performance and protection against plant pathogens; moreover, they may enhance protection from insect pests, by triggering plant resistance mechanisms. Defense barriers against insects are induced by the activation of metabolic pathways involved in the production of defense-related plant...

Here we present additional data on the Aphidiinae fauna of Kyrgyzstan. We identified 18 species. One species new to science ( Trioxys depressus sp. nov. ) is described, while 11 are reported for first time: Aphidius avenae Haliday, A. ervi matricariae salicis urticae Ephedrus cerasicola Starý, E. niger Gautier, Bonnamour & Gaumont, Lysiphlebus cardui (Marshall), L. confusus Tremblay Ead...

Melanaphis sorghi (Theobald, 1904) is an invasive species recently introduced in the American continent and has been causing great losses sorghum crop. In surveys carried out cities of Uberlândia Sete Lagoas, state Minas Gerais, Brazil, during year 2021, mummified specimens M. were collected on plants, from which parasitoid Aphidius platensis (Brèthes, 1913) (Hymenoptera: Braconidae: Aphidiinae...

Five new species of Helpis Simon, 1901 from Queensland and New South Wales are diagnosed, described and illustrated: H. foelixi sp. nov. (♂); H. merriwa sp. nov. (♀); H. staregai sp. nov. (♀); H. wanlessi sp. nov. (♀) and H. wisharti sp. nov. (♀). The male of H. kenilworthi Żabka, 2002 is described for the first time, Helpis gracilis Gardzińska, 1996 is illustrated to show intraspecific variati...

Many insects harbour facultative symbiotic bacteria, some of which have been shown to provide resistance against natural enemies. One of the best-known protective symbionts is Hamiltonella defensa, which in pea aphid (Acyrthosiphon pisum) confers resistance against attack by parasitoid wasps in the genus Aphidius (Braconidae).We asked (i) whether this symbiont also confers protection against a ...

Naturally occurring parasitoids may provide sufficient control of aphid pests in fields undisturbed by insecticides. Yet the efficacy of these parasitoids may be strongly influenced by characteristics of their hosts and by the availability of alternative hosts in neighbouring crops. In the present study, parasitoid guild structure was compared in two aphid species, Brevicoryne brassicae and Lip...

Studies on the Mechanism of the Hypertensive Effect of Prostaglandin F . D. W. DUCHARME, J. R. WEEKS AND R. G. MONTGOMERY 1 Venoconstrictive Action of Bradykinin. RICHARD P. BOBBIN AND PAUL S. GUTH... 11 Antiarrhythmic Activity of Some Isoquinoline Derivatives Determined by a Rapid Screening Procedure in the Mouse. JAMES W. LAWSON 22 The Effects of Reserpine on Vasopressin-Cholesterol-Induced A...