Back to basics focus for KZN wattle growers

NCT Forestry organised an informative field day in October for its members and farmers in South Africa’s KwaZulu-Natal (KZN) Midlands region. Terry Wolhuter of Elands Spruit Farm in New Hanover hosted the event.

Roger Poole, from NCT, explained that the wattle farming area in KZN has been decreasing over the past decade due to various factors such as land returned to new owners who are not interested in tree farming, wattle being vulnerable to pests and diseases, and damage caused by wild and domesticated animals.

The theme for the day was 'Back to Basics', meaning it is crucial to focus on getting the basic principles of tree farming right to ensure the health of your trees and to get a return on your investment.

The day was divided into two parts. Indoors, attendees heard presentations on pests and diseases by Brett Hurley from the Forestry & Agriculture Biotechnology Institute (FABI) and the demand for pulpwood during the 2024-2025 financial season by Rob Thompson of NCT.

The outdoor session included presentations from NCT's tree farming manager, Craig Norris, on wattle clones, planting, pruning, thinning, and maintenance by Friedel Eggers of UCL, as well as the timber specs required by the NCT mills for harvested timber by NCT's Greytown area manager Cliff Walton.

INDOOR SESSION

Wattle pathogens

Brett Hurley of FABI and the Tree Protection Cooperative Programme (TPCP) started the day's programme with information on the latest pest and pest-related diseases affecting wattle trees.

These include the wattle rust fungus, which infects the foliage of trees and stems of saplings, flowers, and seed pods. Telia, resembling brown powdery masses, develop dry on young host tissue but become slimy under wet conditions. In severe cases, wattle rust can reduce the growth of young black wattle trees by up to 40%. A lot of work is being done through the Institute for Commercial Forestry Research (ICFR) to breed rust-tolerant trees.

Other noteworthy pathogens in the KZN region are Ceratocystis wilt and Phytophthora species. The Ceratocystis wilt is a relatively new disease that affects wounds on black wattle. Hence, it is crucial when pruning to make clean cuts and avoid unnecessary stem damage, as these can become entry points of this pathogen.

Phytophthora spp is present in the midlands area, causing leaf and root rot. The Tree Protection Cooperative Programme (TPCP) is doing research to gain a better understanding of this pathogen.

Wattle pests

Brett said tree pests affecting wattle includethe Melanterius seed weevil, Aqrilus grandis, a wood-boring jewel beetle, and white grubs.

The Melanterius weevils are seed feeders that lay eggs and feed on wattle seed. Lately, it has been noted that there has been a shift in its feeding pattern, and it is now infesting and feeding on young shoots and twigs of the black wattle. The weevils typically have one generation per year, coinciding with seed maturity. The Melanterius weevil is present in the Howick region.

The Agrilus grandis jewel beetle is a wood borer in the Melmoth region. It is native to the South and East African areas. It bores underneath the bark and leaves a network of tunnels. Researchers are trying to find out why it is now attacking wattle.

Ongoing work is being done on white grubs to learn more about the different species and what drives them. Brett requested growers to alert the FABI team if they detect heavy white grub infestations on their farms and plantations.

Brett said FABI’s Diagnostic Clinic is open to NCT and TWK members and partners free of charge. Individuals and organisations that are not members are charged a fee for the service. The clinic identifies plant pests and diseases so that appropriate management strategies can be adopted.

Pulpwood demand 2024-2025

NCT's Rob Thompson began his presentation with a reality check: "If you thought we were the only ones with problems, please think again".

He said 46,000 American workers in all 36 ports went on strike for about four days recently, demanding a wage increase of up to 50%. The strike cost America over $5 billion per day and caused shortages of items ranging from bananas to essential goods.

Shifting the focus closer to home, Rob announced that NCT Richards Bay Mill's two chipping lines are operating well. Durban Wood Chips has recently reopened after a successful mill service shutdown in September, with the damaged vessel loader now back in operation.

Rob noted that NCT's current challenges included the strong Rand-Dollar exchange rate (R17,44 on 8 October 2024) and the hard and dry wattle being received by the mill, which negatively affected chipping blades. This old stock has been significantly drawn down at the mills and NCT farm depots.

Pulpwood demand for the 2024 – 2025 financial period indicates that Durban Wood Chips will require an estimated 500,000 tons of wattle and 120,000 tons of Eucalyptus smithii. Richards Bay Wood Chip would need about 1,3 million tons of wattle. Thompson hoped 2025 would be prosperous for NCT, its members, and partners.

IN THE FIELD

Wattle clones

NCT's Craig Norris explained why planting clones in modern forestry is preferable. Wattle clones are genetically identical which means they grow better, there is more uniformity and need less thinning. For example, rust-tolerant clones have a higher MAI (mean annual increment) than commercial seedlings.

He advised farmers to plant the frost-tolerant clones at the exposed valley bottoms where frost occurs. “Frost tolerant does not mean frost-resistant”, he warned, “they are more likely to survive severe frost events”.

SP644 was the first commercial rust-tolerant clone released in SA and was fast-tracked to combat the impact of wattle rust. It shows increased growth and better uniformity than commercial black wattle seedlings.

Craig said AF01 is currently the best-performing rust-tolerant wattle clone. Corrective pruning may be necessary due to heavier branching.

JC108 is the latest rust-tolerant clone to be released. It is similar to AF01 but with a better stem form. FW54 is currently the only frost-tolerant wattle clone on the market. It is explicitly bred for rust tolerance but shows no growth advantage over commercial seedlings.

Craig urged growers to remember:

Silviculture

Friedel Eggers of UCL stressed the importance of good site preparation before planting, including the correct pit depth and width (25cm x 25cm) and pre-plant weeding (weed-free pits). Planting espacement of 3m x 1.8m is recommended for clones, and you need to maintain the compartment weed-free for the first year.

Pruning should be done in winter before the trees are two metres tall. Prune only the double leaders and branches competing with the prominent stem leader. Do not over-prune, as it can inhibit tree growth. Make clean cuts, not too close to the main stem, to avoid infection.

Friedel said that if the above is observed and the site is ideal for wattle, it is easy to get yields of up to 120 tonnes per hectare from wattle clones. This produces a nett standing value (after harvesting and transport costs are deducted) of roughly R90,000/hectare.

Specifications

NCT's Cliff Walton outlined the timber specifications for harvesting wattle. Logs must not be fire-damaged as it is difficult for the mills to bleach burnt timber. The correct length for logs is 2.4m, with diameters between 5cm and 40cm. There must be no knots, bark, and mud. The logs must be delivered 4 to 10 weeks after felling.

Ensure that the logs are free of contamination like nails, steel, plastic, fungal growth, oil or anything else that may negatively influence pulp quality. Other factors to watch out for include drought-stressed timber, which is identified by low moisture and the presence of wood borers.

Thanks to the sponsors

The field day ended with a braai and drinks courtesy of NCT and other event sponsors, including Stihl, Midlands Spray Chem, Sunshine Seedlings, TWK, Rhino Charcoal, Rolfes Agri, and Eland Earth Moving.

Wattle field day in Eswatini

Wattle growers at the field day networking and watching demo’s of forestry tools.

A successful wattle field day jointly organised by Eswatini-based Montigny Investments and South African-based NTE was held at Mhlambanyatsi in Eswatini recently, attended by around 60 enthusiastic tree farmers and stakeholders.

The aim of the field day was to promote co-operation and networking between stakeholders involved in forestry business across the border, and to share ideas about how to grow and market wattle timber and bark effectively.

Eza Mapipa of NTE said that Eswatini (formerly Swaziland) has good growing conditions for wattle, and that co-operation and collaboration between wattle growers, processors and marketers across the border was important in order to expand the resource into the future. Montigny has vast areas planted to wattle in Eswatini, and there are many small scale wattle growers active there as well, said Eza.

Presentations from invited guests from forestry businesses were followed by a field visit to a Montigny wattle plantation with live demonstrations of latest equipment and methods.

NCT Forestry’s Craig Norris discussed the importance of good land preparation for planting wattle with quality pits and good planting techniques. He also touched on the need for effective after-care and weed control to ensure productive, uniform stands.

Erich Jacobs of Sunshine Seedlings shared info about sourcing good quality planting stock and how to look after the seedlings on their journey from nursery to field. It is crucial to transport them carefully so that seedlings are not damaged in transit. He said they should be kept in a shaded area and watered regularly so they don’t dry out before they are planted.

The Stihl hand-operated earth auger makes good quality, uniform pits for planting trees.

The Stihl team demonstrated the use of a Stihl earth auger for creating uniform pits for planting, and also the effectiveness of the Stihl MS 260 chainsaw that is light but powerful and well suited to forestry work.

Callum McKenzie of Pietermaritzburg-based Silvix Forestry demonstrated the use of various forestry tools including the Faka-Plenty hand-operated planting tube that enables a field worker to put a seedling in the ground and add gel to the pit without having to stoop down, as well as some highly effective spraying tools for effective weed control.

Callum McKenzie of Silvix Forestry demonstrates a hand-held sprayer connected to a specially designed backpack for effective weed control.

Cliff Walton of NCT shared info about Project Wattle Regen, a joint NCT and NTE programme that provides support to small-scale wattle growers in the KwaZulu-Natal midlands. These growers supply their timber to NCT and the wattle bark to the NTE factory at Hermannsburg.

William Aherin, Industrial Manager at NTE, provided some info on the wattle bark market, while Eza Mapipa shared insights on corrective pruning of young wattle trees to maximise growth and tree form. He also demonstrated the correct way to bundle wattle bark for transporting to the NTE bark factory at Iswepe just outside Piet Retief in South Africa.

Eza Mapipa of NTE demonstrates the correct way to bundle wattle bark for transporting to the bark factory.

Eza explained that the bark should be delivered as fresh as possible, preferably within 24 hours of harvesting. The bark should also be securely bundled with the white inner bark facing inwards so it is protected from exposure to the sun and weather. This will ensure top quality fresh bark that fetches a premium price.

error: Content is protected !!