New mango hybrid NMBP-1243

Page last updated: Monday, 25 October 2021 - 3:50pm

Please note: This content may be out of date and is currently under review.

Three new mango varieties have been developed by the National Mango Breeding Program (NMBP). NMBP-1243 is a hybrid cross between Irwin and Kensington Pride (KP). Yield is medium to heavy and consistent year to year. The fruit has an average weight of 507 grams.

It has a strong red/pink blush over a pale yellow background and similar flavour to KP. This is an early season variety maturing two to four weeks earlier than KP. Hot water dipping and vapour heat treatment cause little damage. NMBP-1243 is licensed and protected under Australian Plant Breeder’s Rights legislation.


Parentage Irwin  x  Kensington Pride
Fruit colour Strong red/pink blush on a pale yellow background when ripe
Average fruit weight 319-799g, average of 507g
Fruit shape Ovate and deeper than wide, with a small sharp beak that flattens out at full maturity. The stem end is flat or slightly depressed
Background skin colour Pale yellow background with an intense pink/red blush that covers up to 80% of the skin when fully exposed to the sun. Only a weak blush when fruit is fully shaded
Skin thickness 0.81mm (medium)
Fruit flavour Classical KP flavour
Fruit firmness Similar to KP when ripe
Pulp Light orange with a soft texture and very slight fibre. Depth of a cut cheek is 30mm
Lenticels Medium in size and density, with a light yellow colour
Seed embryo Monoembryonic
Tree canopy Medium vigour with open canopy
Cropping Mature grafted trees produce 20-90 kilograms per tree
Harvest season Early season in Darwin, Kununurra and Mareeba (2-4 weeks before KP)
Plant Breeder's Rights status Granted by IP Australia on 26 June 2009


Medium to heavy yield, consistent year to year.

NMBP-1243 tree yields from a replicated trial block on Frank Wise Institute (FWI) near Kununurra, WA, and a private farm, expressed on a per tree and per hectare basis at different planting densities.





FWI tree


Farm tree


185 trees/ha

(9 x 6m)


312 trees/ha

(8 x 4m)


185 trees/ha

(9 x 6m)


2 year-old 10.21 15.10 1.90 3.20 4.60
3 year-old 36.95 2.80 6.80 11.50 5.50
4 year-old 31.17 4.30 5.80 8.70 7.70
5 year-old 18.02 19.90 3.39 5.60 5.90
6 year-old 22.74 - 4.21 7.10


7 year-old 54.40 - 10.10 17.00 16.80

Fruit weight

The average fruit weight is 507g with 47% in the 460–540g range. About 30% will pack out 14 to 16 fruit per 7 kilogram tray and 15% as 16 to 20 fruit per tray.

More information is available on request.


Fruit maturity indicators

Fruit maturity indicators for acceptable flavour were evaluated with fruit grown at Kununurra. This information will be used to produce a harvest guide, which is yet to be released.

Minimum fruit maturity indicators to develop acceptable eating quality in NMBP-1243 grown in Kununurra and compared with KP and Calypso standards

Dry matter


Flesh colour

(hue angle)

Total dissolved solids


Titratable acidity


NMBP-1243 12.6 101 7.8 1.9
Calypso 14.0 98 7.0 -
Kensington Pride 14.0 - - -

Harvest timing

NMBP-1243 maturity is early season. Typically fruit will ripen on the tree two to four weeks earlier than Kensington Pride at the same location.

More information is available on request.

Postharvest management

Preliminary evaluation with small quantities of NMBP-1243 fruit to assess their postharvest performance after treatment with hot water, vapour heat and irradiation treatments has been conducted.

Hot water and VHT disinfestation

NMBP-1243 responded well to hot water and vapour heat treatment with little damage to the fruit, resulting in high quality fruit acceptable for sale.

Fruit grown at Mareeba and Kununurra was treated with hot water dip (HWD) at 46.1°C for 85 minutes and with vapour heat (VHT) at 47°C for 15 minutes. The treatments did not cause the fruit to soften, develop skin browning, increase the incidence of fruit rots or delay skin de-greening.

Lenticel spotting was low in treated fruit.

Irradiation disinfestation

NMBP-1243 responded well to irradiation with no discernible difference apart from slowing of the fruit colouring and ripening process by 1-3 days. The variety appears free of lenticel spotting with an excellent open appearance. Fruit maintained equal firmness across both samples. Shelf life was exceptional in both treated and untreated fruit. 

Observations were made from non commercial samples shipped to Steritech via road and air without ethylene ripening over two seasons, from Darwin and Kununurra. Samples were re-packed into a shaded pattern to observe variations in both colour / ripening stages within treated samples as well as variations between control and treated samples. 

Treated samples were processed on commercial 400Gy New Zealand runs where possible, with the majority of samples achieving an absorbed dose between 500 and 800Gy. Fruit was held at 14 degrees Celsius after treatment. 

It is expected that commercial production volumes will allow a developed understanding and control of unique variables for each variety  important to optimising the treatment process. Ripeness and colour stage of mangoes at time of treatment are well known and important factors for optimising quality. The treatment slows ripening and de-greening (pers. comm. Benjamin Reilly, Steritech Brisbane 2018).

Plant Breeder’s Rights

NMBP-1243 was granted a certificate of Plant Breeder’s Rights in June 2009 giving the breeders and their agents exclusive rights to manage the propagation, growing and sale of the variety.


This information is also available in Vietnamese (see attachment).


For queries about the National Mango Breeding Program, please contact:

For commercial queries-

For technical information-


Tara Slaven