By Eamonn Ryan
South Africa’s agricultural sector is entering a period of heightened uncertainty. A potential El Niño event, combined with rising input costs linked to geopolitical tensions involving Iran, is creating a dual pressure on farmers. This is part one of a two-part series.
The result could be reduced crop yields, increased food prices, and significant strain on the country’s cold chain infrastructure.
According to Wandile Sihlobo, chief economist of the Agricultural Business Chamber, there is a growing likelihood that below-normal rainfall will coincide with South Africa’s critical summer planting season. both the developing El Niño and rising input costs could affect citrus and stone fruit, but the impacts are more nuanced than for rain-fed grains.
Citrus: Less rain risk, more heat and cost pressure
Citrus in South Africa is largely grown under irrigation, particularly in regions like Limpopo, Eastern Cape and Western Cape. That reduces direct reliance on rainfall, but it doesn’t eliminate risk.
- Water availability becomes critical: Even irrigated orchards depend on dams, rivers and groundwater. Prolonged dry conditions can lower dam levels, forcing water restrictions at key stages of fruit development.
- Heat stress affects fruit quality: High temperatures during fruit set and growth can lead to smaller fruit, sunburn damage and lower export grades – directly impacting profitability.
- Increased irrigation demand: Hotter, drier conditions mean higher water usage and pumping costs, especially as electricity and diesel prices rise.
- Cold chain sensitivity increases: Citrus destined for export must meet strict quality standards. Heat-stressed fruit often requires faster and more precise pre-cooling and cold storage to maintain shelf life.
- Timing matters too: the main citrus harvest runs from winter into early spring. If drought conditions persist into late summer and autumn, they can affect fruit sizing and quality before harvest begins.
Stone fruits: More directly exposed
Stone fruits – such as peaches, nectarines, plums and apricots – are generally more sensitive to climatic variability.
- Chilling requirements: Many varieties need sufficient winter chill to break dormancy properly. Warmer, erratic winters linked to El Niño can disrupt flowering and reduce yields.
- Water stress during fruit development: Unlike citrus, some stone fruit production areas rely more heavily on consistent seasonal rainfall. Water shortages can lead to smaller fruit and increased drop rates.
- Shorter harvest windows: Stone fruits are highly perishable. Any quality issues caused by heat or drought tighten already narrow picking and cooling windows, placing pressure on packhouses and the cold chain.
Cost pressures across both sectors
The geopolitical backdrop – particularly tensions involving Iran – feeds into higher fuel and fertiliser costs, which hit both citrus and stone fruit growers:
- Transport costs rise, affecting delivery to packhouses, ports and export markets.
- Cold storage becomes more expensive, especially with energy-intensive refrigeration.
- Input decisions change, with some farmers potentially cutting back on fertiliser or crop protection, which can affect yield and quality.
Cold chain implications
For both citrus and stone fruit, the cold chain becomes even more critical under these conditions:
- Faster pre-cooling is needed to remove field heat from stressed fruit
- More precise temperature control is required to prevent spoilage
- Export logistics must be tightly co-ordinated to avoid delays and quality losses
In short, citrus is somewhat buffered by irrigation but still vulnerable to water constraints, heat and rising costs. Stone fruits, on the other hand, are more directly exposed to climatic shifts and may see greater variability in yield and quality.
If the predicted conditions materialise, the biggest risk isn’t just lower volumes – it’s inconsistent quality, which has a disproportionate impact on export-driven sectors like citrus.
Reference: Agbiz
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