Bruising, mechanical damage, stem rot, internal or vascular browning, chilling injury, and ripeness are avocado defects that cannot be detected with the human eye. Avocado producers aim to identify these internal defects without cutting their valuable fruit open, reduce their waste, and avoid misclassification. Here you will find which technologies make this possible.
How avocado waste is squeezing producers’ margins
The global avocado market in 2025 surpassed $20 billion [ref]. By 2030, the demand is expected to increase by another $7 billion, with an annual compound growth rate (CAGR) of 7.4% [ref, ref]. This will result in an annual production of 12 million tons, making the avocado the second best-selling tropical fruit in the world [ref]. Europe still holds a quarter of the global avocado market, a reported $5.38 billion in 2025, with an average growth rate of 16%. There are two countries that are leading the avocado market growth: Germany with a 32% growth rate and Italy with a 26% growth rate [ref].
Although the avocado market future looks promising, producers are struggling with an average of 24.1% post-harvest loss [ref]. Internal defects account for part of the waste that is draining the avocado margins. Below, seven of the most common avocado defects are listed: what they are, where they are found, and which technologies can detect them.
Seeing it for yourself: MRI scan vs. physical sample
Left side: an AI-powered MRI scan slice (2D visualization) of a whole, unripe avocado, showing dark, mottled discoloration tracing along the vascular tissue from the stem end, the internal signature of early stem rot, weeks before it would be visible from outside.
Right side: the same avocado, physically cut open, confirming the browning pattern the scan flagged.
Avocado internal defects explained
AI-powered MRI detects all seven defects not just a few
Every one of the seven defects above shares the same underlying challenge: they develop inside the fruit, often before any external symptom appears, and by the time they're visible from outside, it's frequently too late to act. The tools currently used across the avocado supply chain are almost all light-based. Near-infrared (NIR) spectroscopy , has been available since the 1950s and the technology behind some handheld avocado quality meters, works by measuring the spectral fingerprint of light reflected from or transmitted through the fruit; but that light typically penetrates only up to about 9 to 11 mm into an avocado before it's absorbed or scattered [ref]. That's a meaningful improvement over the naked eye, but stem rot, deep bruising, chilling injury near the seed, and vascular browning frequently sit well beyond that depth. Hyperspectral imaging faces a similar ceiling, and neither technology can reliably resolve defects at the fruit's core.
AI-powered MRI works on a fundamentally different physical principle. Unlike light, the radio waves and low magnetic field used in MRI aren’t scattered or absorbed by opaque tissue. They interact with water and fat molecules throughout the fruit, so one scan captures the whole avocado from skin to core. That means bruising near the surface, mechanical damage mid-flesh, stem rot approaching from the vascular system, chilling injury spreading from the core, and uneven ripening around the seed cavity can all be captured in the same scan.
Frequently Asked Questions
What are the most common defects when growing avocados?
Externally, growers commonly deal with ridging, sunburn, lenticel damage, thrip damage, and scarring; mostly cosmetic issues with limited effect on internal quality. The more consequential defects, though, are internal: bruising and mechanical damage from handling, stem rot spreading from the stem end, chilling injury from improper cold storage, and ripening disorders such as uneven, premature, or checkerboard ripening. These internal defects are responsible for the bulk of the estimated 20–40% post-harvest losses seen across the avocado supply chain.
What attributes commonly determine avocado quality?
Avocado quality is typically assessed using dry matter and oil content (which predict flavor and ideal harvest timing), firmness (an indicator of ripeness stage), external skin color and defect percentage, and internal flesh condition — including the presence of bruising, discoloration, or vascular browning. Because avocados only ripen after harvest, getting the maturity assessment right at picking time has an outsized effect on all of these downstream attributes.
How can you tell if an avocado is good without cutting it open?
The classic gentle-squeeze test only estimates firmness and, by extension, ripeness stage; it says nothing about internal bruising, stem rot, chilling injury, or vascular browning happening beneath the skin. Skin color is similarly unreliable on its own, since color formation varies by cultivar, growing region, and season. Handheld NIR devices can estimate dry matter and detect some near-surface discoloration, but their penetration is limited to roughly the outer 5 mm of the fruit. The most reliable way to check an avocado's true internal condition without cutting it open is whole-fruit imaging technology such as AI-powered MRI, which sees all the way to the seed while keeping the fruit intact and sellable.
About the Author
Aikaterini Mavroudi, Junior MRI Application Specialist
With a background in medical technology engineering, Aikaterini focuses on understanding and analyzing defects in fresh produce, such as avocados. Before joining Orbem, she worked with mid-infrared spectroscopy at Helmholtz Center’s Chair for Biological Imaging.
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