Rubi MG 1192 is one of the Brazilian coffee varieties that was developed with a fairly practical brief: take useful characteristics from Mundo Novo and Catuaí, then select plants that perform well under Brazilian growing conditions.
The result is a short, vigorous and productive coffee plant with red cherries and relatively uniform maturation. It isn't one of Brazil's more fashionable varieties, but it has been widely grown in Minas Gerais and remains part of the country's broader coffee breeding story.
Where did Rubi come from?
Rubi began with breeding work at the Instituto Agronômico de Campinas (IAC) in the 1960s, using Mundo Novo and Catuaí in an attempt to combine useful characteristics from both cultivars.
The material was introduced into Minas Gerais in the 1970s, where researchers continued selecting and evaluating different progenies. The programme was coordinated through the Minas Gerais agricultural research system, including EPAMIG and UFLA.
One of the resulting lines was MG 1192, which was eventually released for commercial cultivation as Rubi MG 1192.
The breeding history is therefore a little more complicated than simply saying “Mundo Novo crossed with Catuaí”. Multiple generations of selection were involved, and further breeding work using related material continued after the original crosses.
What was Rubi bred to do?
The aim was to take some of Mundo Novo's vigour and productivity and combine it with the shorter growth habit associated with Catuaí.
That combination is visible in the finished plant. Rubi is low-growing, with a rounded canopy, abundant secondary branches and strong vegetative growth. Its productive branches are somewhat more open than those of Catuaí, allowing more light and air into the centre of the plant.
Researchers were also interested in maturation. Rubi generally matures a little earlier and more uniformly than Catuaí, which can help with harvest planning.
Rubi in the field
Rubi MG 1192 is a relatively short coffee plant, reaching around two metres under mature growing conditions. Its compact structure allows closer spacing than would be practical with a tall variety such as Mundo Novo.
Brazilian recommendations commonly use around 2.5–3.5 metres between rows and 0.6–0.8 metres between plants. In higher-elevation areas, wider spacing between plants may be preferable because very tight planting can lead to less uniform maturation.
The variety has high productivity and strong vegetative vigour. In trials, Rubi has continued producing well without the early decline in vigour or drying of productive branches that breeders were looking to avoid.
That performance isn't identical everywhere. Research on Mundo Novo and Catuaí-derived progenies shows significant interaction between genotype and environment, which is one reason Brazilian breeding programmes evaluate varieties across multiple regions before recommending them widely.
What does Rubi look like?
Rubi is easy to distinguish from the taller Mundo Novo plants in a mixed field.
The canopy is relatively low and rounded, the branching is abundant and young leaves are predominantly bronze. Mature cherries are red and the seeds are medium-sized, with a flattened shape.
The combination of short stature and good productivity is one of the main reasons Rubi has remained useful to growers. It can be managed comparatively easily and suits both manual and mechanised production systems.
What does Rubi taste like?
Rubi is generally considered capable of producing good-quality coffee, although the cup depends heavily on where and how it is grown.
Brazilian research commonly evaluates Rubi alongside Catuaí and Mundo Novo for both productivity and beverage quality. Rather than having one fixed varietal flavour profile, coffees can shift according to altitude, climate, harvest conditions and processing.
In practice, well-produced Rubi often makes a sweet, balanced cup with good body. Chocolate, caramel, nuts and ripe fruit can all appear, but those are useful descriptions of individual coffees rather than characteristics that every Rubi must have.
Processing can push the coffee in different directions. Natural coffees can develop more body, sweetness and dried-fruit character, while washed lots can show more clarity and definition.
Rubi and the Brazilian family tree
Rubi sits in the large family of cultivars that grew out of Brazilian breeding work with Mundo Novo and Catuaí.
Mundo Novo contributes a history of strong vigour and high productivity. It is also a tall plant, which can make harvesting and close planting more difficult.
Catuaí was created from Mundo Novo and Caturra and became one of Brazil's most widely planted cultivars because of its low stature and productivity.
Rubi came from subsequent breeding work involving Mundo Novo and Catuaí. It retained the low stature associated with Catuaí while showing strong vigour and productivity of its own.
Rubi isn't therefore a simple halfway point between the two parents. It is better understood as one of several selected outcomes from a long-running Brazilian breeding programme.
How productive is Rubi?
High productivity is one of Rubi's strongest documented characteristics.
In trials conducted in Minas Gerais and elsewhere, Rubi MG 1192 has consistently performed as a vigorous and productive cultivar. One evaluation by Incaper recorded average production above 33 bags of processed coffee per hectare.
Its uniform maturation is another practical advantage. Where planting density and environmental conditions are suitable, relatively even ripening can make selective harvesting and crop management easier.
The disease problem
Rubi's main weakness is coffee leaf rust.
Unlike some newer Brazilian cultivars that were bred specifically for rust resistance, Rubi MG 1192 is susceptible to Hemileia vastatrix. It is also susceptible to nematodes.
That doesn't make it unsuitable for farming. It simply means disease management remains important, particularly in areas where rust pressure is high.
The distinction is useful because Rubi is sometimes grouped together with newer Brazilian varieties that have stronger disease resistance. They shouldn't be treated as equivalent.
Why Rubi is still around
Rubi has never had the same profile as a competition-focused variety, and it wasn't designed around unusual cup characteristics.
Its value is more straightforward. It is short, vigorous, productive and reasonably adaptable, with maturation characteristics that work well for Brazilian production.
That makes it a useful example of how coffee breeding actually works. Not every cultivar needs to be dramatically different from what came before. Sometimes the goal is to take a combination of characteristics that already works and make it a little more useful in the field.
Quick varietal facts
Varietal: Rubi MG 1192
Species: Coffea arabica
Parentage: Mundo Novo × Catuaí
Origin: Brazil
Initial breeding work: IAC, 1960s
Further selection: EPAMIG/UFLA, Minas Gerais
Commercial release: Rubi MG 1192
Growth habit: Low, rounded canopy with abundant secondary branches
Leaf colour: Young leaves predominantly bronze
Cherry colour: Red
Bean size: Medium
Maturation: Early to intermediate and relatively uniform
Yield: High
Vigour: High
Disease resistance: Susceptible to coffee leaf rust and nematodes
Adaptation: Broad adaptation across Brazilian growing regions
Typical cup profile: Sweet and balanced with good body; flavour varies with growing conditions and processing
Further reading
- EPAMIG: Arabica Coffee Cultivars Developed by EPAMIG
- Ciência e Agrotecnologia: Evaluation and Selection of Progenies from Catuaí × Mundo Novo Crosses
- Revista Ceres: Agronomic Performance of Progenies from Mundo Novo × Catuaí
Interested in Rubi's family tree? Read our guides to Mundo Novo, Catuaí, and Caturra.