Coffee Borer Beetle in Hawaiʻi: How Farmers Protect Coffee Quality

The coffee borer beetle in Hawaiʻi, more accurately known as the coffee berry borer (CBB), is one of the most serious agricultural pests affecting coffee production in the islands. But for coffee drinkers, there is an important distinction to make right away: this is a farming and crop-quality problem, not a bug-in-your-cup problem.

Coffee berry borer attacks coffee cherries while they are growing on the tree. The insect enters the fruit and can damage the seed inside—the part that eventually becomes a coffee bean. That damage can reduce usable yield and affect coffee quality if it is not properly managed.

For Hawaiʻi coffee growers, the challenge is significant. It requires careful monitoring, efficient harvesting, field sanitation, and integrated pest-management practices. For coffee roasters and consumers, the focus shifts to sourcing, selection, roasting, and maintaining high quality from green bean to finished cup.

What Is the Coffee Berry Borer?

The coffee berry borer, scientifically known as Hypothenemus hampei, is a very small beetle that attacks coffee fruit.

Female beetles bore into coffee cherries and create galleries inside the seeds, where they lay eggs. The developing larvae then feed on the coffee seed. Because much of the insect's life cycle occurs inside the fruit, it can be difficult to control once it has entered the berry.

Coffee beans begin as seeds inside coffee cherries, which is why damage at this stage can affect the usable coffee that eventually moves through processing and roasting. A closer look at what a coffee cherry is helps explain the connection between healthy fruit and finished coffee.

Coffee Berry Borer in Hawaiʻi at a Glance

When Did Coffee Berry Borer Reach Hawaiʻi?

Coffee berry borer was first detected in South Kona on Hawaiʻi Island in 2010. It was subsequently found on Oʻahu in 2014, Maui in 2016, Kauaʻi in 2020, and Lānaʻi in 2020.

The Hawaiʻi Department of Agriculture confirmed CBB on Maui in December 2016 and later expanded quarantine restrictions on coffee and other potential host materials from the island.

These locations should not be treated as interchangeable. Kona and Kaʻū are distinct coffee-growing districts on Hawaiʻi Island, while Maui is a separate island with its own coffee-growing areas and coffee traditions.

Why Is Coffee Berry Borer a Serious Problem for Coffee Farmers?

Coffee berry borer is a major concern because it attacks the seed growers are trying to harvest.

According to the University of Hawaiʻi at Mānoa College of Tropical Agriculture and Human Resources, CBB damage can contribute to:

• Premature dropping of young coffee berries

• Greater vulnerability of infested ripe fruit to fungal or bacterial infection

• Reduced coffee yield

• Reduced coffee quality

The severity varies depending on infestation levels, harvest timing, and how effectively the pest is managed.

This is why CBB is taken seriously across Hawaiʻi's coffee industry. The goal is not simply to eliminate an insect. It is to protect the healthy coffee cherries and beans that ultimately determine how much quality coffee can move forward through processing.

Does Coffee Berry Borer Mean There Are Bugs in Roasted Coffee?

No. Coffee berry borer should not be confused with a pest problem in a bag of roasted coffee.

CBB is an agricultural pest. It attacks coffee cherries while they are developing in the field. The concern is that feeding inside the seed can damage the bean and reduce its quality or usability.

By the time coffee reaches consumers, it has already gone through multiple stages that can include harvesting, processing, drying, milling, green-coffee selection, sorting, and roasting.

So when coffee professionals discuss CBB, they are primarily talking about crop protection and coffee quality, not insects appearing in a finished cup.

How Do Hawaiʻi Coffee Farmers Fight Coffee Berry Borer?

There is no single solution to coffee berry borer. Hawaiʻi growers use an integrated pest-management approach that combines multiple practices throughout the coffee-growing cycle.

University of Hawaiʻi guidance emphasizes several important measures.

Careful Monitoring

Growers need to know whether CBB is present and how severe an infestation may be. Monitoring helps determine when management actions are needed.

Efficient Harvesting

Removing ripe coffee fruit frequently is important because fruit left on the tree can continue to provide habitat for CBB.

Field Sanitation

Sanitation is one of the most important parts of CBB management. Coffee berries left on trees or dropped on the ground can shelter beetles between harvest periods.

Removing leftover berries helps reduce opportunities for the insect to survive and reproduce.

Integrated Pest Management

Depending on farm conditions, growers may combine sanitation and harvesting practices with other approved controls.

Hawaiʻi agriculture agencies and the University of Hawaiʻi have spent years developing and refining recommendations designed specifically for local coffee production.

Why Harvesting Matters So Much

Coffee harvesting is often described as a quality decision—selecting ripe cherries at the right time. In areas affected by CBB, it is also an important part of pest management.

The University of Hawaiʻi recommends removing ripe and dropped fruit efficiently during harvest and cleaning up remaining berries after the harvest season. Old berries can provide a place for beetles to remain between crops.

That means careful harvesting serves two purposes: protecting the quality of the current crop and reducing pest pressure on future production.

What Does Coffee Berry Borer Mean for Maui Coffee?

Coffee berry borer has been present on Maui since 2016, so it is one of the agricultural challenges local coffee growers must manage.

That does not mean Maui coffee is inherently damaged or lower quality.

Coffee quality depends on many interconnected factors, including:

• Coffee variety

• Growing conditions

• Crop health

• Harvest timing

• Sorting

• Processing

• Green-coffee selection

• Storage

• Roasting

Maui is associated with distinctive coffees that deserve to be understood on their own terms rather than grouped together with every other Hawaiian origin. One example is Maui Mokka, a coffee closely associated with Maui.

Coffee drinkers looking specifically for island-grown options can also explore 100% Maui coffee.

How Is Coffee Quality Protected After the Farm?

Farmers are the first line of defense against CBB, but coffee quality does not stop at harvest.

After coffee leaves the farm, processing, milling, sorting, green-bean selection, storage, and roasting all contribute to the quality of the final product.

That distinction is particularly important for an artisan roastery such as The Coffee Store , which does not own or operate coffee farms. Its role begins with sourcing green coffee and continues through roasting and preparation for customers.

The Coffee Store sources coffees from several origins, including Maui, Kona, Kaʻū, and international coffee-growing regions. Coffee origin is identified carefully rather than treating all Hawaiian coffees as interchangeable.

The coffee is then roasted in small batches, with the roasting process guided by experienced sensory judgment. That allows quality considerations to continue beyond the farm and into the finished roast.

Does Coffee Berry Borer Make Hawaiian Coffee Lower Quality?

Not automatically.

CBB can damage coffee seeds and reduce quality when infestation is severe. But the existence of the pest in a growing area does not determine the quality of every coffee produced there.

Growers can reduce its impact through effective management, and later stages such as sorting, processing, green-coffee selection, and roasting provide additional opportunities to maintain quality.

A better way to understand the issue is this:

Coffee berry borer creates an additional quality challenge. It does not define the quality of Hawaiian coffee.

Coffee Berry Borer: Problem and Response

Is Coffee Berry Borer the Same as Coffee Leaf Rust?

No. They are two different threats to coffee production.

Coffee berry borer is an insect that attacks coffee fruit and seeds.

Coffee leaf rust is a fungal disease that affects coffee leaves.

Both can affect coffee production, but they attack different parts of the plant and require different management approaches.

Why Should Coffee Drinkers Care About CBB?

For coffee drinkers, the value of understanding coffee berry borer is not that they need to worry about finding insects in their coffee.

It is that CBB reveals how much agricultural work goes into producing quality coffee.

Before a bag of coffee ever reaches a roaster, growers may already have spent months:

• Monitoring coffee trees

• Managing pest pressure

• Harvesting ripe fruit

• Removing fallen or leftover berries

• Protecting the next crop

• Sorting and processing harvested coffee

That work is part of the reason origin, farming practices, processing, sourcing, and roasting all matter when evaluating specialty coffee.

Frequently Asked Questions About Coffee Borer Beetle in Hawaiʻi

What is the coffee borer beetle in Hawaiʻi?

The coffee borer beetle, more accurately called the coffee berry borer, is a small insect that enters coffee cherries and feeds inside the seeds that eventually become coffee beans.

Are there coffee berry borers in roasted coffee?

Coffee berry borer is primarily a field pest that attacks developing coffee cherries. The issue for the coffee industry is crop damage and bean quality rather than insects living in brewed coffee.

When was coffee berry borer found in Hawaiʻi?

CBB was first detected in South Kona on Hawaiʻi Island in 2010. It was later found on Oʻahu, Maui, Kauaʻi, and Lānaʻi.

When was coffee berry borer found on Maui?

Coffee berry borer was confirmed on Maui in December 2016.

How do Hawaiʻi coffee farmers manage coffee berry borer?

Management includes monitoring, efficient harvesting, removing fallen and leftover berries, field sanitation, and other integrated pest-management practices.

Does coffee berry borer ruin all Hawaiian coffee?

No. Its presence in a growing region does not mean every coffee lot is damaged. Effective farm management and later quality-control steps can reduce its impact.

Can coffee berry borer affect coffee quality?

Yes. Damage to coffee seeds can reduce yield and quality, particularly when infestation is severe or poorly managed.

Is coffee berry borer only a problem in Kona?

No. CBB has been detected on multiple Hawaiian islands, including Maui.

Protecting Quality From Farm to Cup

Coffee berry borer is a serious challenge for coffee farmers in Hawaiʻi, but it is also a story about how the coffee industry responds.

Growers use monitoring, careful harvesting, sanitation, and integrated pest management to protect their crops. Processing and sorting help separate damaged coffee. Roasters then make their own sourcing and quality decisions before transforming green beans into the coffee customers brew at home.

For specialty coffee drinkers, that is the more useful takeaway: CBB is a challenge being actively managed, not a reason to avoid Hawaiian coffee.

The Coffee Store continues that quality chain through intentional sourcing and small-batch, artisan  roasting, with coffee origins clearly distinguished across Maui, Kona, Kaʻū, and other growing regions.

Explore Hawaiian Coffee From MauiCoffee.com

Those interested in discovering coffees connected to Hawaiʻi can explore the current selection at MauiCoffee.com, including 100% Maui coffee.

For questions about coffee origin, current availability, roasting, or ordering, visit MauiCoffee.com for product information and contact options.