Categories: Vegetables

Learning about cucurbits

Cucurbits are a group of plants belonging to the gourd family (Cucurbitaceae). They include pumpkins and squashes (Cucurbita spp), melons (Cucumis melo), cucumbers (C. sativus) and watermelons (Citrullus lanatus).

Cucurbits were first cultivated in the Americas about 10 000 years ago; by 500 years ago, a number of distinct cultivars had been developed.

Watermelons were grown 4 000 years ago in North Africa. They remain an important crop there and in the Middle East, where the hot, dry conditions contribute to their popularity.

Melons and cucumbers are native to Asia; the latter are thought to be the last of the Cucurbitaceae to be domesticated.

The universal popularity of cucurbits means that new varieties are continually being developed. Tradition also determines which cultivars are popular in different regions and countries.

Various cultivars of the pumpkin species Cucurbita maxima are grown in South Africa.

White-skinned Boer pumpkins were the ‘standard’ variety for many decades until grey-skinned pumpkin varieties started to arrive from New Zealand and Australia.

This tastes better and is more productive. A good yield for a Boer pumpkin was 25t/ha; some grey hybrids can produce 60t/ha.

The pumpkin species grown in the US for Halloween is Cucurbita pepo, a different species to our pumpkins.

Every now and again, one comes across a newspaper article of a grower showing off a gigantic gem squash.

These vegetables are the result of crossing a Halloween pumpkin with a gem squash. It is often unintentional and occurs when a grower collects seed from a gem squash fertilised by a bee that earlier visited a Halloween pumpkin, perhaps on another property.

C. pepo also includes marrows and patty pans; all of these will readily cross with one another.

I am often asked if different species of cucurbits grown in the same area will cross with one another. They will not; it takes great effort and expertise to carry out an interspecies cross.

Slightly larger
Gem squash was developed by crossing two squash species: C. texana from the US and C. fraternal from Mexico.

The first South African gem squash cultivar was Little Gem, a flecked-skin variety with a better flavour than the original. The trouble, though, is that it quickly becomes stringy and the rind develops a yellow colour, so it has to be harvested at exactly the right stage, which is a constraint. Yields, however, are good.

Over the years, Little Gem has been largely replaced by Rolet, a slightly larger, dark-skinned variety developed by the Agricultural Research Council. Like Little Gem, it is a runner.

Better yields
Compact hybrid runners have since been developed for increased yields. These start bearing closer to the crown and offer a more concentrated yield.

Despite this, rows should not be planted too close together as this will reduce yield.

The plants are best spaced in rows about 1,8m apart, as in the case of runners.

Bill Kerr is a vegetable specialist and a breeder of a range of vegetables.

Share
Published by
Bill Kerr

Recent Posts

  • Caxton
  • Use only text
  • World

Taking rooftop farming to the next level in Paris

Paris’ flagship farming project is nearing completion, with the city preparing to become home to one of the world’s largest…

2 days ago
  • Featured Home Image
  • How to Business

Why a farmer has to be realistic

A farm can only produce according to its potential and what’s invested in it, says Roelof Bezuidenhout.

2 days ago
  • Featured Home Image
  • Horses

Watch out for wasps in the stable

These aggressive insects can cause painful stings in humans and horses. Dr Mac provides some useful tips on treating your…

3 days ago
  • Caxton
  • South Africa
  • Use only text

1 000ha of Limpopo farmland burnt in protest action

It has been estimated that as much as 1 000ha of farmland near the town of Alma in Limpopo have…

3 days ago
  • Caxton
  • South Africa
  • Use only text

New traceability technology can give consumers peace of mind

While the traceability of retail items in the consumer goods industry has been in place for some time, the industry…

3 days ago
  • South Africa

Farmers urged to vaccinate livestock proactively

Livestock owners are being urged to vaccinate livestock proactively against vector-borne diseases such as Rift Valley fever (RVF), rather than…

4 days ago