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About Tenco
Tenco is one of New Zealand’s largest exporters of forest products. We have built to this position since 1991 when the company was set up to export lumber to growing Asian export markets.  Experience and reputation count; from small beginnings Tenco has become the largest independent exporter of New Zealand lumber and New Zealand’s 4th largest log exporter.  Tenco has a regular shipping program of their own log vessels and in combination with these and other ships currently calls  at 7 New Zealand ports (5 North Island and 2 South Island).
Tenco buys standing forests.  Tenco currently has a number of forests which they purchased at harvestable age to log over a number of years for export and domestic markets.  Tenco also regularly buys smaller tracts of forest to harvest immediately or immature forests to hold until harvest time.  Tenco is interested in broadening  the  base of owners from whom it purchases forests and stands of trees.  A deal with Tenco is a certain transaction.  The owner and Tenco will agree on a value of the tree crop and then Tenco will pay this amount to the owner either in a lump sum amount or on rate per volume unit out-turn from the forest depending on the nature of the tree crop.
Tenco knows there are a lot of farmers who have trees that are close or ready to harvest and will be asking themselves how they should proceed with the sale of their trees.  For some farmers the kind of certain transaction with money in the bank could well be appealing. Tenco is actively interested in buying harvestable forests or trees from areas including all the North Island (except the Gisborne and East Coast districts) and Nelson & Marlborough in the South Island .
If you own a forest in this area (16 years and older) and are ready to enter into this kind of agreement Tenco is interested to develop something with you.
Please contact: 
Work: +64 7 357 5356  Mobile:  +64 21 921 595

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Stringing Up the Stringybarks

Denis Hocking's blog
Saturday, July 08, 2017

The stringybark eucalypts were identified some years ago as a promising group for solid wood production in New Zealand with a combination of good growth rates, early heartwood formation, relatively few forest health issues, relatively easy sawing and processing with less growth stress than many species plus ease of drying, and finally good wood properties combining strength, stability and good durability for above ground uses. More than a dozen species all have very similar timbers while offering some differences in site tolerance, especially frosting. Another plus is that they thrive on lower fertility sites. The new uncertainty today is, I guess, how they handle myrtle rust in our environments as monocalypt eucalypts are recognised as being generally more susceptible than symphomyrtus species.

This enthusiasm for stringybarks was seen in the farm forestry stringybark trials established more than ten years ago, though I have not seen any recent analysis of the current status of the trial.

I have been an enthusiastic stringybark advocate for many years after discovering, in the ‘80s, how well they performed on my sand dunes. This was somewhat contrary to the official advice of the time I might add which recommended “moist, fertile, free-draining sites”. I do agree with the last recommendation and I might add that monocalypt eucalypts generally do seem to be more drought sensitive than symphyomyrtus species, but fertility is definitely optional. Oh, and they can be grown a long way south of Northland contrary to opinion of the ’80s.

My problem with current work on the stringybarks is that in my opinion the focus is on the wrong species. While we need more than one species to cover our different environments, especially frosting, resources are limited and so there tends to be one focus species. At the moment this would seem to be E. globoidea, (white stringybark) but I think it ought to be E. muelleriana, (yellow stringybark). Why?????

  1. Well I will be very honest and admit some people will see some self interest here as E. muelleriana is easily the best performing stringybark on my sand dunes. But you also find big, healthy old E. muelleriana popping up in odd corners round the Manawatu/Whanganui region. People who attended the logging demonstration day at this year’s conference may not have realised that there are some impressive 60/70 year old E. muelleriana amongst various other species, E. fastigata, E. saligna etc. in a Euc. stand they probably noticed on the way up to the logging site in Grenock Forest. E. muelleriana might not be the best performer on all sites, but it is certainly impressive on many sites.
  2. However one of the main reasons I got onto E. muelleriana was its reputation for high quality timber, perhaps best summarised in Keith Bootle’s all-encompassing tome “Wood in Australia: Types, Properties and Uses”. He describes E. muelleriana as “Probably the best of the stringybarks for wood quality” (p 348 in second edition). In support of this I would note the Davies-Colleys’ enthusiasm for the species and also the furniture tutors at our local polytech UCOL, who consider it probably the best working timber of the 6-8 eucalypts species I have supplied.
  3. In my experience E. globoidea has never matched E. muelleriana for growth or form on my sites with quite a number of dif- ferent seedlots. A year ago, through contacts with Paul Millen and the DFI, I supplied some E. globoidea logs to Nelson Pine for rotary peeling and LVL trials. A lot of technical data was recorded in the process by Canterbury University students. It was a hell’uva long way and an expensive truck trip to come for some rather uninspiring logs, that apparently didn’t perform especially well. I was very keen to see them take some same age E. muelleriana logs that would have been larger diameter, straighter and quite possibly, in view of those superior wood properties, might have peeled better. But no, it had to be E. globoidea.
  4. So what does E. globoidea have in its favour? I know the breeders think it has more potential because of its greater genetic diversity. It is undeniably genetically diverse, and I well remember the late Ian Brooker, during his late 1990's visit here, suggesting someone needed to spend 6 months sorting out the white stringybarks because there are probably several species buried under the current labels. If you are starting behind the competitor regarding wood properties and you are breeding with essentially different species, there may be some delay in producing a reliable winner as you move through hybrids, that should have the advantage of hybrid vigour, and then have to breed back to a consistent phenotype. Another alternative might be vegetative propagation of selected hybrids, but that also means more work and expense to develop systems. And if you are dealing with hybrids, why not hybridise with other stringybarks species.

There are also claims that E. globoidea is more durable than the other stringybarks. I am not convinced of this. The gold standard for durability of Australian timbers is probably Thornton et als’ Forestry and Forest Products Report No: 1475. Unfortunately E. globoidea wasn’t included in their graveyard tests, though the other white stringybarks E. eugenioides and E. eugenioides (Wilkinson’s stringybark) were and they were upper class 3 durability along with two other stringybarks including E. muelleriana. Bootle lists all stringybarks as class 3 in the ground and class 2 or 3 above ground, with E. globoidea and E. muelleriana both listed as class 3 in the ground and class 2 out of the ground. I might add that this tallies with my experience. You could certainly breed for higher durability, but if you also want good growth rates, superior form and early heartwood formation progress may be slightly retarded.

So my plea is “let’s hear it for E. muelleriana”. I am sure there will be many opinions out there, possibly even some that agree with me.

Wood and species

John Purey-Cust Ponders
Thursday, May 25, 2017

I was encouraged to read in a recent Southland Times that living in a wooden house gives health benefits. The reporter’s name (Natalia Didovich) sounds Russian and Russians like wood, and the source of her information was a report put out by “The Planet Ark Environmental Foundation”. I must call up Mr Google and explore further.

I have, and found an Australian environmental group strongly in favour of wood, ‘responsibly produced’ (for which I read ‘plantations included’) and illustrated with attractive pictures of wood based architecture. Take a look – maybe I am biased, living in a Lockwood house.

Moving on. A month ago I joined a group going up to a field day on Berriedale, a property south of Waihola. It was a bright sunny day, a good audience well mixed by age and occupation, and open and welcoming hosts David and Helen Vollweiller, on a sheep property with trees and natural manuka in the gullies.

And there lies the first question. Someone referred to the trees as a good use for ‘unproductive land’. Force of pastoral habit speaking perhaps because by the well tended, healthy and vigorous appearance of the plantings (mostly radiata, with some macrocarpa, douglas fir and eucalypts) the gullies are very productive, though perhaps not for sheep.

Then ‘Markets’ arose when we were at a stand of Euc nitens. There the voice of the sawmill supply chain spoke – how to get a sufficient log supply for a good mill run of the unconventional and how do we find a buyer for the sawn product? The answer is simple – often we don’t.

Radiata and douglas fir are simple – an established chain of mills and markets, consultants and log buyers - but volume is still important and farm foresters are usually not so big. For other species something different is needed and I hark back to John Wardle’s Woodside. His radiata goes through established channels into an established market, log quality compensating for a small harvest yield, but his beech, for which there is no log market, he saws himself on a portable mill and finds his own market for the sawn timber. It is a lesson that I only appreciated quite recently, conveniently too late to do much about it, my androscoggin poplars being in mind. The sawmillers and the log marketers speak for the world they know, the present, now. That is not necessarily the world farm foresters live in, and we have to allow for that.

Economic woodlot size has been questioned too – but what is too small? The answer for radiata, providing there is quality (for which I read pruned and thinned) and good access, is ‘pretty small’. Again I hark back to Woodside – a sustained yield of radiata logs from 27.5 hectares – and there are other examples, in the latest (February) Tree Grower and in the Farm Forestry Members Newsletter no. 97 (also February).

The Tree Grower article (‘A harvest result to confound the experts’) describes the result of harvesting a one hectare block of 26 year old radiata pine – nett income $57,669, of which pruned logs (55.5% by volume) produced 78% of sale value. A nett annual stumpage of $2,218.

It seems that the owners have planted a hectare a year on each of their two farms and this was the oldest and first to be felled.

The Southland Farm Forestry Newsletter article (‘Good forest management decisions yield spectacular financial outcome’) describes the harvesting of two blocks (24 and 25 year old) of radiata totalling 8.6 hectares. The results work out at a nett stumpage per hectare of $61,430, or annually $2,507. It is mentioned that all the pruned logs went to local mills.

A good subject for a local field day – find a member who contemplates planting radiata and have an on-site discussion of the choices available – seedling types, silvicultural regimes, final crop objectives, and yes, etc.etc.

In both cases you can find more detail in the relevant publications, which all members of Farm Forestry will have. And logging machinery gets smaller too. See the tractor mounted winch used by Roger May (FebruaryTree Grower) and note his comments on sawing ‘unsaleable’ species

Disclaimer: Personal views expressed in this blog are those of the writers and do not necessarily represent those of the NZ Farm Forestry Association.

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