There are no reliable methods for assessing post-harvest losses of fresh fruits and vegetables. Any assessment can only refer to a particular value chain on a particular occasion, and even then it is difficult to account for quality loss or to distinguish between unavoidable moisture losses and losses due to poor post-harvest handling or other factors described above.
Accurate records of losses at various stages of the marketing chain are rarely kept, especially in tropical countries where losses may be higher, making it virtually impossible to reliably assess the potential cost-effectiveness of interventions at different stages of the chain. The absence of such information can lead to inappropriate interventions by governments and donors.
Source: wikipedia.org
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