1. Estimations of number of active loci, dominance and heritability in polygenic inheritance of gregarious behavior inMuscidifurax raptorellus [Hymenoptera: Pteromalidae]

   • E. F. Legner

   OriginalPaper Pages: 1 - 18

2. Development ofBrachymeria ovata [hymenoptera: chalcididae] in three noctuid hosts reared on artificial diet and insect-resistant and susceptible soybean genotypes

   • D. J. Rogers
   • M. J. Sullivan

   OriginalPaper Pages: 19 - 27

3. Adaptation d'Oecophylla longinoda [Formicidae-Formicinae] aux variations spatio-temporelles de la densité de proies

   • A. Dejean

   OriginalPaper Pages: 29 - 54

4. Results of the fifth joint pesticide testing programme carried out by the IOBC/WPRS-Working Group “Pesticides and beneficial organisms”

   • S. A. Hassan
   • F. Bigler
   • G. Viggiani

   OriginalPaper Pages: 55 - 67

5. The introduction ofMimorista pulchellalis [Lepidoptera: Pyraustidae] into South Africa for the biological control of jointed cactus,Opuntia aurantiaca 1. Biology and mass-rearing techniques

   • E. Nieman

   OriginalPaper Pages: 69 - 76

6. The introduction ofMimorista pulchellalis [Lepidoptera: Pyraustidae] into South Africa for the biological control of jointed cactus,Opuntia aurantiaca. 2. Field evaluation

   • E. Nieman

   OriginalPaper Pages: 77 - 86

7. Ultraviolet penetration of pine trees and insect virus survival

   • H. J. Killick
   • S. J. Warden

   OriginalPaper Pages: 87 - 94

8. Characteristic of parasitism of diamondback moth by two larval parasites

   • N. S. Talekar
   • J. C. Yang

   OriginalPaper Pages: 95 - 104

9. Release density, efficiency and disappearance ofTrichogramma nubilale for control of European corn borer

   • D. A. Andow
   • D. R. Prokrym

   OriginalPaper Pages: 105 - 113

10. Host plant testing ofUrophora quadrifasciata [Diptera: Tephritidae] againstCarthamus tinctorius and two North American species ofCentaurea

    • N. E. Rees
    • J. M. Story

    OriginalPaper Pages: 115 - 119

11. L'induction maternelle de la diapause larvaire chezDinarmus acutus [Hym.: Pteromalidae]

    • G. Fabres
    • C. Reymonet

    OriginalPaper Pages: 121 - 129

12. Different responses of three predatory mite species toTetranychus urticae, Eriophyes dioscoridis andBrevipalpus pulcher: Evidence for the existence of kairomones and allomones

    • Aly H. Rasmy
    • H. A. Abdel-Rahman
    • H. E. Hussein

    OriginalPaper Pages: 131 - 137

13. Etudes comparatives de l'influence de la température et de la nourriture sur le développement deAmblyseius andersoni, Neoseiulus fallacis, Galendromus longipilus etTyphlodromus pyri [Acari: Phytoseiidae]

    • M. Genini
    • A. Klay
    • M. Baillod

    OriginalPaper Pages: 139 - 154

14. Erratum

    • R. N. Wiedemann
    • R. J. O'Neil

    Erratum Pages: 155 - 155