Appendix A. Numbered list of 62 articles used in a previous review (Poveda et al. 2008), including 45 articles used in the present meta-analysis; numbers 1, 3, 9, 10, 13, 15, 23, 24, 31, 32, 35, 38, 41, 42, 43, 47, and 49 did not meet criteria concerning data reporting or plant richness treatments for the meta-analysis.
1. Adeniyi, O. R. 2001. An economic evaluation of intercropping with tomato and okra in a rain forest zone of Nigeria. Journal of Horticultural Science & Biotechnology 76:347–349.
2. Badenes-Perez, F. R., A. M. Shelton, and B. A. Nault. 2005. Using yellow rocket as a trap crop for diamondback moth (Lepidoptera : Plutellidae). Journal of Economic Entomology 98:884–890.
3. Begum, M., G. M. Gurr, S. D. Wratten, P. R. Hedberg, and H. I. Nicol. 2006. Using selective food plants to maximize biological control of vineyard pests. Journal of Applied Ecology 43:547–554.
4. Bell, V. A., R. J. Brightwell, and P. J. Lester. 2006. Increasing vineyard floral resources may not enhance localised biological control of the leafroller Epiphyas postvittana (Lepidoptera : Tortricidae) by Dolichogenidea spp. (Hymenoptera : Braconidae) parasitoids. Biocontrol Science and Technology 16:1031–1042.
5. Bender, D. A., W. P. Morrison, and R. E. Frisbie. 1999. Intercropping cabbage and Indian mustard for potential control of lepidopterous and other insects. Hortscience 34:275–279.
6. Berndt, L. A., S. D. Wratten, and S. L. Scarratt. 2006. The influence of floral resource subsidies on parasitism rates of leafrollers (Lepidoptera : Tortricidae) in New Zealand vineyards. Biological Control 37:50–55.
7. Bjorkman, M., P. A. Hamback, and B. Ramert. 2007. Neighbouring monocultures enhance the effect of intercropping on the turnip root fly (Delia floralis). Entomologia Experimentalis et Applicata 124:319–326.
8. Bukovinszky, T., H. Trefas, J. C. van Lenteren, L. E. M. Vet, and J. Fremont. 2004. Plant competition in pest-suppressive intercropping systems complicates evaluation of herbivore responses. Agriculture Ecosystems & Environment 102:185–196.
9. Bullas-Appleton, E. S., C. Gillard, and A. W. Schaafsma. 2005. Aggregation of potato leaf hoppers, Empoasca fabae (Harris) (Homoptera: Cicadellidae), on a trap crop in an edible bean, Phaseolus vulgaris L., intercropping system. Canadian Journal of Plant Science 85:237–242.
10. Butts, R. A., K. D. Floate, M. David, R. E. Blackshaw, and P. A. Burnett. 2003. Influence of intercropping canola or pea with barley on assemblages of ground beetles (Coleoptera: Carabidae). Environmental Entomology 32:535–541.
11. Cai, H. J., Z. S. Li, and M. S. You. 2007. Impact of habitat diversification on arthropod communities: A study in the fields of Chinese cabbage, Brassica chinensis. Insect Science 14:241–249.
12. Chabi-Olaye, A., C. Nolte, F. Schulthess, and C. Borgemeister. 2005. Abundance, dispersion and parasitism of the stem borer Busseola fusca (Lepidoptera : Noctuidae) in maize in the humid forest zone of southern Cameroon. Bulletin of Entomological Research 95:169–177.
13. Chabi-Olaye, A., C. Nolte, F. Schulthess, and C. Borgemeister. 2005. Relationships of intercropped maize, stem borer damage to maize yield and land-use efficiency in the humid forest of Cameroon. Bulletin of Entomological Research 95:417–427.
14. Cividanes, F. J., and J. C. Barbosa. 2001. Effects of no-tillage and of soybean-corn intercropping on natural enemies and pests. Pesquisa Agropecuaria Brasileira 36:235–241.
15. Colley, M. R., and J. M. Luna. 2000. Relative attractiveness of potential beneficial insectary plants to aphidophagous hoverflies (Diptera : Syrphidae). Environmental Entomology 29:1054–1059.
16. den Belder, E., J. Elderson, and P. F. G. Vereijken. 2000. Effects of undersown clover on host-plant selection by Thrips tabaci adults in leek. Entomologia Experimentalis et Applicata 94:173–182.
17. Duale, A. H., and K. F. Nwanze. 1999. Incidence and distribution in sorghum of the spotted stem borer Chilo partellus and associated natural enemies in farmers' fields in Andhra Pradesh and Maharashtra states. International Journal of Pest Management 45:3–7.
18. English-Loeb, G., M. Rhainds, T. Martinson, and T. Ugine. 2003. Influence of flowering cover crops on Anagrus parasitoids (Hymenoptera : Mymaridae) and Erythroneura leafhoppers (Homoptera : Cicadellidae) in New York vineyards. Agricultural and Forest Entomology 5:173–181.
19. Fitzgerald, J. D., and M. G. Solomon. 2004. Can flowering plants enhance numbers of beneficial arthropods in UK apple and pear orchards? Biocontrol Science and Technology 14:291–300.
20. Frere, I., J. Fabry, and T. Hance. 2007. Apparent competition or apparent mutualism? An analysis of the influence of rose bush strip management on aphid population in wheat field. Journal of Applied Entomology 131:275–283.
21. Gao, F., F. Ge, X. Liu, and Y. Song. 2008. Impact of insecticides on the structure and productivity of insect pest and natural enemy communities associated with intercropping in cotton agroecosystems. International Journal of Pest Management 54:103–114.
22. Gianoli, E., I. Ramos, A. Alfaro-Tapia, Y. Valdez, E. R. Echegaray, and E. Yabar. 2006. Benefits of a maize-bean-weeds mixed cropping system in Urubamba Valley, Peruvian Andes. International Journal of Pest Management 52:283–289.
23. Girma, H., M. R. Rao, and S. Sithanantham. 2000. Insect pests and beneficial arthropods population under different hedgerow intercropping systems in semiarid Kenya. Agroforestry Systems 50:279–292.
24. Guvenc, I. N., and E. Yildirim. 2006. Increasing productivity with intercropping systems in cabbage production. Journal of Sustainable Agriculture 28:29–44.
25. Hanna, R., F. G. Zalom, and W. J. Roltsch. 2003. Relative impact of spider predation and cover crop on population dynamics of Erythroneura variabilis in a raisin grape vineyard. Entomologia Experimentalis et Applicata 107:177–191.
26. Harvey, C. T., and M. D. Eubanks. 2004. Effect of habitat complexity on biological control by the red imported fire ant (Hymenoptera : Formicidae) in collards. Biological Control 29:348–358.
27. Hooks, C. R. R., and M. W. Johnson. 2004. Using undersown clovers as living mulches: effects on yields, lepidopterous pest infestations, and spider densities in a Hawaiian broccoli agroecosystem. International Journal of Pest Management 50:115–120.
28. Hooks, C. R. R., and M. W. Johnson. 2006. Population densities of herbivorous lepidopterans in diverse cruciferous cropping habitats: Effects of mixed cropping and using a living mulch. Biocontrol 51:485–506.
29. Jones, G. A., and J. L. Gillett. 2005. Intercropping with sunflowers to attract beneficial insects in organic agriculture. Florida Entomologist 88:91–96.
30. Jones, G. A., and K. E. Sieving. 2006. Intercropping sunflower in organic vegetables to augment bird predators of arthropods. Agriculture Ecosystems & Environment 117:171–177.
31. Kamunya, S. M., F. N. Wachira, J. Lang'at, W. Otieno, and V. Sudoi. 2008. Integrated management of root knot nematode (Meloidogyne spp.) in tea (Camellia sinensis) in Kenya. International Journal of Pest Management 54:129–136.
32. Khan, Z. R., J. A. Pickett, L. J. Wadhams, A. Hassanali, and C. A. O. Midega. 2006. Combined control of Striga hermonthica and stemborers by maize-Desmodium spp. intercrops. Crop Protection 25:989–995.
33. Khan, Z. R., C. A. O. Midega, A. Hassanali, J. A. Pickett, L. J. Wadhams, and A. Wanjoya. 2006. Management of witchweed, Striga hermonthica, and stemborers in sorghum, Sorghum bicolor, through intercropping with greenleaf desmodium, Desmodium intortum. International Journal of Pest Management 52:297–302.
34. Khan, Z. R., C. A. O. Midega, D. M. Amudavi, A. Hassanali, and J. A. Pickett. 2008. On-farm evaluation of the 'push-pull' technology for the control of stemborers and striga weed on maize in western Kenya. Field Crops Research 106:224–233.
35. Lale, N. E. S., and B. M. Sastawa. 2000. Evaluation of host plant resistance, sowing date modification and intercropping as methods for the control of Mylabris and Coryna species (Coleoptera : Meloidae) infesting pearl millet in the Nigerian Sudan savanna. Journal of Arid Environments 46:263–280.
36. LaMondia, J. A., W. H. Elmer, T. L. Mervosh, and R. S. Cowles. 2002. Integrated management of strawberry pests by rotation and intercropping. Crop Protection 21:837–846.
37. Lee, J. C. and G. E. Heimpel. 2005. Impact of flowering buckwheat on lepidopteran cabbage pests and their parasitoids at two spatial scales. Biological control 34:290–301.
38. McIntyre, B. D., C. S. Gold, I. N. Kashaija, H. Ssali, G. Night, and D. P. Bwamiki. 2001. Effects of legume intercrops on soil-borne pests, biomass, nutrients and soil water in banana. Biology and Fertility of Soils 34:342–348.
39. Midega, C. A. O., Z. R. Khan, J. Van den Berg, C. Ogol, J. A. Pickett, and L. J. Wadhams. 2006. Maize stemborer predator activity under 'push-pull' system and Bt-maize: A potential component in managing Bt resistance. International Journal of Pest Management 52:1–10.
40. Midega, C. A. O., Z. R. Khan, J. van den Berg, C. Ogol, A. S. Dippenaar-Schoeman, J. A. Pickett, and L. J. Wadhams. 2008. Response of ground-dwelling arthropods to a 'push-pull' habitat management system: spiders as an indicator group. Journal of Applied Entomology 132:248–254.
41. Nabirye, J., P. Nampala, M. W. Ogenga-Latigo, S. Kyamanywa, H. Wilson, V. Odeke, C. Iceduna, and E. Adipala. 2003. Farmer-participatory evaluation of cowpea integrated pest management (IPM) technologies in Eastern Uganda. Crop Protection 22:31–38.
42. Ndemah, R., F. Schulthess, S. Korie, C. Borgemeister, H. M. Poehling, and K. Cardwell. 2003. Factors affecting infestations of the stalk borer Busseola fusca (Lepitoptera : Noctuidae) on maize in the forest zone of Cameroon with special reference to scelionid egg parasitoids. Environmental Entomology 32:51–60.
43. Ngeve, J. M. 2003. The cassava root mealybug (Stictococcus vayssierei Richard) (Homoptera : Stictococcidae): a threat to cassava production and utilization in Cameroon. International Journal of Pest Management 49:327–333.
44. Ogol, C., J. R. Spence, and A. Keddie. 1999. Maize stem borer colonization, establishment and crop damage levels in a maize-leucaena agroforestry system in Kenya. Agriculture Ecosystems & Environment 76:1–15.
45. Parajulee, M. N., and J. E. Slosser. 1999. Evaluation of potential relay strip crops for predator enhancement in Texas cotton. International Journal of Pest Management 45:275–286.
46. Perfecto, I., J. H. Vandermeer, G. L. Bautista, G. I. Nunez, R. Greenberg, P. Bichier, and S. Langridge. 2004. Greater predation in shaded coffee farms: The role of resident neotropical birds. Ecology 85:2677–2681.
47. Pitan, O. O. R., and G. O. Olatunde. 2006. Effects of intercropping tomato (Lycopersicon esculentum) at different times with cowpea (Vigna unguiculata) or okra (Abelmoschus esculentus) on crop damage by major insect pests. Journal of Agricultural Science 144:361–368.
48. Pontin, D. R., M. R. Wade, P. Kehrli, and S. D. Wratten. 2006. Attractiveness of single and multiple species flower patches to beneficial insects in agroecosystems. Annals of Applied Biology 148:39–47.
49. Rao, M. R., and M. N. Mathuva. 2000. Legumes for improving maize yields and income in semi-arid Kenya. Agriculture Ecosystems & Environment 78:123–137.
50. Rukazambuga, N., C. S. Gold, S. R. Gowen, and P. Ragama. 2002. The influence of crop management on banana weevil, Cosmopolites sordidus (Coleoptera : Curculionidae) populations and yield of highland cooking banana (cv. Atwalira) in Uganda. Bulletin of Entomological Research 92:413–421.
51. Sastawa, B. M., M. Lawan, and Y. T. Maina. 2004. Management of insect pests of soybean: effects of sowing date and intercropping on damage and grain yield in the Nigerian Sudan savanna. Crop Protection 23:155–161.
52. Schader, C., J. G. Zaller, and U. Kopke. 2005. Cotton-basil intercropping: Effects on pests, yields and economical parameters in an organic field in Fayoum, Egypt. Biological Agriculture & Horticulture 23:59–72.
53. Schulthess, F., A. Chabi-Olaye, and S. Gounou. 2004. Multi-trophic level interactions in a cassava-maize mixed cropping system in the humid tropics of West Africa. Bulletin of Entomological Research 94:261–272.
54. Sekamatte, B. M., M. Ogenga-Latigo, and A. Russell-Smith. 2003. Effects of maize-legume intercrops on termite damage to maize, activity of predatory ants and maize yields in Uganda. Crop Protection 22:87–93.
55. Showler, A. T., and S. M. Greenberg. 2003. Effects of weeds on selected arthropod herbivore and natural enemy populations, and on cotton growth and yield. Environmental Entomology 32:39–50.
56. Skelton, L. E., and G. W. Barrett. 2005. A comparison of conventional and alternative agroecosystems using alfalfa (Medicago sativa) and winter wheat (Triticum aestivum). Renewable Agriculture and Food Systems 20:38–47.
57. Smith, H. A., and R. McSorley. 2000. Potential of field corn as a barrier crop and eggplant as a trap crop for management of Bemisia argentifolii (Homoptera : Aleyrodidae) on common bean in North Florida. Florida Entomologist 83:145–158.
58. Smith, H. A., R. McSorley, and J. A. S. Izaguirre. 2001. Effect of intercropping common bean with poor hosts and nonhosts on numbers of immature whiteflies (Homoptera : Aleyrodidae) in the Salama Valley, Guatemala. Environmental Entomology 30:89–100.
59. Smith, H. A., R. L. Koenig, H. J. McAuslane, and R. McSorley. 2000. Effect of silver reflective mulch and a summer squash trap crop on densities of immature Bemisia argentifolii (Homoptera : Aleyrodidae) on organic bean. Journal of Economic Entomology 93:726–731.
60. Songa, J. M., N. Jiang, F. Schulthess, and C. Omwega. 2007. The role of intercropping different cereal species in controlling lepidopteran stemborers on maize in Kenya. Journal of Applied Entomology 131:40–49.
61. Sperber, C. F., K. Nakayama, M. J. Valverde, and F. D. Neves. 2004. Tree species richness and density affect parasitoid diversity in cacao agroforestry. Basic and Applied Ecology 5:241–251.
62. Wale, M., F. Schulthess, E. W. Kairu, and C. O. Omwega. 2007. Effect of cropping systems on cereal stemborers in the cool-wet and semi-arid ecozones of the Amhara region of Ethiopia. Agricultural and Forest Entomology 9:73–84.