Hand pollination, not pesticides or fertilizers, increases cocoa yields and farmer income

Anderson, 2007, Model based inference in the life sciences: a primer on evidence, Springer Science & Business Media. Asogwa, 2009, Problems associated with pesticide usage and application in Nigerian cocoa production: A review, Afr. J. Agric. Res., 4, 675 Blaser, 2018, Climate-smart sustainable agriculture in low-to-intermediate shade agroforests, Nat. Sustain, 1, 234, 10.1038/s41893-018-0062-8 Bolker, 2009, Generalized linear mixed models: a practical guide for ecology and evolution, Trends Ecol. Evol., 24, 127, 10.1016/j.tree.2008.10.008 Bos, 2007, Shade tree management affects fruit abortion, insect pests and pathogens of cacao, Agric. Ecosyst. Environ., 120, 201, 10.1016/j.agee.2006.09.004 Bos, 2007, Caveats to quantifying ecosystem services: fruit abortion blurs benefits from crop pollination, Ecol. Appl., 17, 1841, 10.1890/06-1763.1 Brooks, 2017, GlmmTMB balances speed and flexibility among packages for zero-inflated generalized linear mixed modeling, The R Journal, 9, 378, 10.32614/RJ-2017-066 Bruce, 2020, Practical Statistics for Data Scientists: 50+ Essential Concepts Using R and Python, O’Reilly Media. Buchanan, 1991 Burnham, 2003, Model Selection and Multimodel Interface: A Practical Information-theoretic Approach, Springer Science & Business Media. Chumacero de Schawe, 2013, Gene flow and genetic diversity in cultivated and wild cacao (Theobroma cacao) in Bolivia, Am. J. Bot., 100, 2271, 10.3732/ajb.1300025 Clough, 2011, Combining high biodiversity with high yields in tropical agroforestry, Proc. Nat. Acad. Sc. U.S., 108, 8311, 10.1073/pnas.1016799108 Clough, 2009, Cacao boom and bust: Sustainability of agroforests and opportunities for biodiversity conservation, Conserv. Lett., 2, 197, 10.1111/j.1755-263X.2009.00072.x Cocoa Initiative, 2018. http://www.cocoainitiative.org/(accessed 2 May 2018). Croft, 1975, Responses of arthropod natural enemies to insecticides, Annu. Rev. Entomol., 20, 285, 10.1146/annurev.en.20.010175.001441 Dechert, 2005, Are partial nutrient balances suitable to evaluate nutrient sustainability of land use systems? Results from a case study in Central Sulawesi, Indonesia. Nutr. Cycl. Agroecosyst., 72, 201, 10.1007/s10705-005-1546-2 Donald, 2004, Biodiversity impacts of some agricultural commodity production systems, Conserv. Biol., 18, 17, 10.1111/j.1523-1739.2004.01803.x Entwistle, 1972 Falque, 1995, Effect of pollination intensity on fruit and seed set in cacao (Theobroma cacao L.), Sex. Plant. Reprod., 8, 354, 10.1007/BF00243203 Forbes, 2017, Increased pollinator habitat enhances cacao fruit set and predator conservation, Ecol. Appl., 27, 887, 10.1002/eap.1491 Frimpong, 2011, Dynamics of insect pollinators as influenced by cocoa production systems in Ghana, J. Pollinat. Ecol., 5, 74, 10.26786/1920-7603(2011)12 Gockowski, 2011, Cocoa intensification scenarios and their predicted impact on CO2 emissions, biodiversity conservation, and rural livelihoods in the Guinea Rain Forest of West Africa, Environ. Manage., 48, 307, 10.1007/s00267-010-9602-3 Groeneveld, 2010, Experimental evidence for stronger cacao yield limitation by pollination than by plant resources, Perspect. Plant Ecol. Evol. Syst., 12, 183, 10.1016/j.ppees.2010.02.005 Hasenstein, 2001, Auxin modification of incompatibility response in Theobroma cacao, Physiol. Plant., 112, 113, 10.1034/j.1399-3054.2001.1120115.x Hettig, 2017 ICCO, 2018 ICCO, 2018 Isaac, 2007, Early growth and nutritional response to resource competition in cocoa-shade intercropped systems, Plant Soil, 298, 243, 10.1007/s11104-007-9362-x Läderach, 2013, Predicting the future climatic suitability for cocoa farming of the world’s leading producer countries, Ghana and Côte d’Ivoire, Climatic Change, 119, 841, 10.1007/s10584-013-0774-8 Lenth, 2018, Package ‘lsmeans’, The American Statistician, 34, 216 MARS, 2018 MARS, 2018 Maas, 2013, Bats and birds increase crop yield in tropical agroforestry landscapes, Ecol. Lett., 16, 1480, 10.1111/ele.12194 Schroth, 2017, From site-level to regional adaptation planning for tropical commodities: Cocoa in West Africa, Mitig. Adapt. Strateg. Glob. Change, 22, 903, 10.1007/s11027-016-9707-y Syarief, 2017, Diversity and Abundance of Natural Enemies of Helopeltis antonii in Cocoa Plantation Related with Plant Pattern and Insecticide Application, Pelita Perkebunan (a Coffee and Cocoa Research Journal)., 33, 128, 10.22302/iccri.jur.pelitaperkebunan.v33i2.266 Steffan-Dewenter, 2007, Tradeoffs between income, biodiversity, and ecosystem functioning during tropical rainforest conversion and agroforestry intensification, Proc. Nat. Acad. Sc. U.S., 104, 4973, 10.1073/pnas.0608409104 Toledo-Hernández, 2017, Neglected pollinators: can enhanced pollination services improve cocoa yields? A review, Agric. Ecosyst. Environ., 247, 137, 10.1016/j.agee.2017.05.021 Tscharntke, 2007 Tscharntke, 2010 Tscharntke, 2011, Multifunctional shade-tree management in tropical agroforestry landscapes – a review, J. Appl. Ecol., 48, 619, 10.1111/j.1365-2664.2010.01939.x UNFCCC, 2018 Valle, 1990, Energy costs of flowering, fruiting, and cherelle wilt in cacao, Tree Physiol., 6, 329, 10.1093/treephys/6.3.329 Wanger, 2009, Conservation value of cacao agroforestry for amphibians and reptiles in South-East Asia: combining correlative models with follow-up field experiments, J. Appl. Ecol., 46, 823, 10.1111/j.1365-2664.2009.01663.x Wanger, 2014, Pollination curbs climate risk to cocoa, Nature, 511, 155, 10.1038/511155b WCF, 2018 Weber, 2007 Wessel, 2015, Cocoa production in West Africa, a review and analysis of recent developments, NJAS-Wagen. J. Life Sc., 74, 1, 10.1016/j.njas.2015.09.001 Witjaksono, 2016, Cocoa farming system in Indonesia and its sustainability under climate change, Agriculture, Forestry and Fisheries, 5, 170, 10.11648/j.aff.20160505.15 Wood, 2008 Young, 1982, Effects of shade cover and availability of midge breeding sites on pollinating midge populations and fruit set in two cocoa farms, J. Appl. Ecol., 19, 47, 10.2307/2402990 Young, 1986, Habitat differences in cocoa tree flowering, fruit-set and pollinator availability in Costa Rica, J. Trop. Ecol., 2, 163, 10.1017/S0266467400000754