The impact of honey bee colony quality on crop yield and farmers' profit in apples and pears

In contrast to studies conducted elsewhere, we did not observe any wild pollinators visiting apple or pear flowers, highlighting the fragility of this conventionally intensified crop production system. We found that such orchard systems can suffer large pollinator deficits affecting farmers' profit. Given that A. mellifera was the only flower visitor, we could estimate the impact of improving colony management on farmer's profit without the influence of other pollinators. Our study also shows that variations within pome crops, i.e. apples and varieties of pears, in pollinator benefits can be very large, and that the assumption of global average values to guide local recommendations can be misleading.