1.The relative importance of ecosystem services and disservices can change
with landscape structure in a poorly understood way. 2.We compare the
impact of biocontrol, provided by bats and birds, with that of crop
raiding by vervet monkeys on yield in South African macadamia orchards.
Insectivorous bats and birds are known to feed on macadamia pest insect
species, like the macadamia nut borer or the green vegetable bug. Vervet
monkeys move into the orchards during the day to feed on premature
macadamia nuts. Bats, birds and monkeys benefit from patches of natural
vegetation adjacent to orchards. 3.With exclusion experiments (four
treatments: day, night, day & night, control) we quantified the
relative importance of biocontrol and crop raiding on yield, comparing two
different landscape settings of the orchards, a natural and a
human‐modified. 4.Crop raiding occurred only close to natural vegetation
and caused yield losses of about 26%. Biocontrol by bats and birds was
higher near natural vegetation, but still significant in human‐modified
landscapes, at up to 530m distance to forest patches. Prevented biocontrol
through the exclusion of bats and birds resulted in yield losses of up to
60%. 5.Effects of biocontrol by bats and birds (USD ~5000/ha/yr) were
economically more important than the losses of crop raiding (USD
~1600/ha/yr). As both are linked to the vicinity of forest patches, the
removal of natural vegetation to limit monkey abundances would also limit
biocontrol service provision. 6.Synthesis and applications. This study
highlights the high economic benefits of biocontrol by bats and birds,
which outweighed negative impacts through yield losses caused by
crop‐raiding monkeys. Management practices to prevent crop damage, such as
guarding, excluding vertebrates or removal of adjacent natural vegetation,
would also limit access for bats and birds and the great economic benefits
provided by their biocontrol. Ecosystem services by bats and birds can be
promoted by the exposure of artificial roost and nest sites, but research
into species‐specific preferences is needed. The education of farmers is
crucial, as many are unaware of the benefits from birds and bats and the
fact that these benefits can outweigh the disadvantages of the monkeys’
crop‐raiding. Linden-JAPPL-2019Excel file with raw data sheets for nut quality and yield measures.