Simultaneous occurrence of thelytoky and bisexuality in hymenopteran species, and its implications for the biological control of pests J. -P. Aeschlimann Opinion Pages: 3 - 5
The scale response ofTrichogramma [Hymenoptera: Trichogrammatidae]: Variation among species in host specificity and the effect of conditioning M. S. ThomsonR. E. Stinner OriginalPaper Pages: 7 - 21
Environmental and endogenous control of diapause inTrichogramma species V. A. ZaslavskiT. Ya. Umarova OriginalPaper Pages: 23 - 29
The influence of host's age on the selectivity of parasitism and fecundity ofTrichogramma S. Ya. ReznikT. Ya. Umarova OriginalPaper Pages: 31 - 37
Fruit infesting tephritids [Dipt.: Tephritidae] and associated parasitoids in Chiapas, Mexico M. AlujaJ. GuillenD. Mota OriginalPaper Pages: 39 - 48
The effect of insecticides on the distribution of foracing parasitoids,Diaeretiella rapae [Hym.: Braconidae] on plants Gu De JiuJ. K. Waage OriginalPaper Pages: 49 - 56
Consumption of carrot weevil,Listronotus oregonensis, [Coleoptera: Curculionidae] by four species of carabids on host plants in the laboratory Ding Xin ZhaoG. BoivinR. K. Stewart OriginalPaper Pages: 57 - 60
Influence of the egg parasitoidPlatytelenomus busseolae [Hym.: Scelionidae] on the population ofSesamia nonagrioides [Lep.: Noctuidae] in central greece M. P. AlexandriJ. A. Tsitsipis OriginalPaper Pages: 61 - 70
Biological control ofSenecio jacobaea in Northern California, an enduring success R. W. PembertonC. E. Turner OriginalPaper Pages: 71 - 77
Effects of the preadatorDugesia dorotocephala [Tricladida: Turbellaria] on selected nontarget aquatic organisms: Laboratory bioassay M. J. PerichL. R. Boobar OriginalPaper Pages: 79 - 83
Host specificity ofAcanthoscelides quadridentatus andA. Puniceus [Col.: Bruchidae] for biological control ofMimosa pigra (with preliminary data on their biology) R. C. KassulkeK. L. S. HarleyG. V. Maynard OriginalPaper Pages: 85 - 97
Interactions betweenAulonium ruficorne [Coleoptera: Colydiidae] and other natural enemies of bark beetles [Coleoptera: Scolytidae] Z. MendelH. PodolerH. Livne OriginalPaper Pages: 99 - 105
Parasitization of the cottony-cushion scale in relation to host size K. Thórarinsson OriginalPaper Pages: 107 - 118
Dynamique des populationsd'un ravageur des pins:Pissodes notatus F. [Col.: Curculionidae] II. — Rôle du parasitisme C. Alauzet OriginalPaper Pages: 119 - 126
Study of the sound produced byPimpla instigator [Hymenoptera, Ichneumonidae] during host selection A. Henaut OriginalPaper Pages: 127 - 139
Host age and host selection byTrichogramma nubilale J. L. HintzD. A. Andow OriginalPaper Pages: 141 - 150
Effects of a granulosis virus, andBacillus thuringiensis on life-table parameters of the potato tubermoth,Phthorimaea operculella R. von ArxF. Gebhardt OriginalPaper Pages: 151 - 159