Truffles – Page 3 – Yarra Valley Truffles: Blog

Truffle hunts, foot traffic and biosecurity.

Competing fungi and heavy feet are two major risks to maturing truffles;

Biosecurity

Many agribusinesses require visitors to utilise some form of biosecurity to protect their business and investment. This varies according to the type of industry from simple footbaths, to full clothed protection for smokers (eg .tobacco leaf virus can destroy tomatoes in greenhouses)

For our truffiere, besides insect pests, there are other fungi that also like to form symbiotic relationships with trees. ECM (ectomycorhizal) fungi compete with truffles for space on the new root tips, and in some cases can totally displace truffle from a tree. Some of our trees were contaminated with these fungi before delivery, with fairy rings of mushrooms growing out from the trees since early years.

This affects around 15% of trees in our truffiere and it is likely we will need to remove and destroy many of the affected trees. Here the tree in the foreground has no signs of truffle at all, but is entirely circled with ECM fungi spreading outwards. Near the dogs is an actively producing tree, with a nice truffle brule around it, the roots from the infected tree will soon reach the brule with unknown consequences.

Current insects that attack near surface truffles ( less than 1” deep) are; snails, slugs, centipedes, slaters (especially the hard shelled “butchy boys”), springtails (1mm grey bug) and finally the occasional mushroom fly (fungus gnat). Management of these is limited to controlling the physical environment, such as reducing leaf litter, and locating at risk truffle early enough to cover with extra soil. We don’t believe chemical controls are acceptable with such a deliciate symbiosis between truffle and tree, nor for a gourmet product.
The last thing we need is additional insects or fungi. We now provide gumboots for the few times a year guests visit the truffiere. This an improvement on the previous use of footbaths which was time consuming, and less effective than farm provided boots. If you do visit a farm elsewhere, ensure you have no soil on your boots, and use footbaths when asked.

There are various other insects and fungi known to cause problems elsewhere in Australian truffiéres, so each area has its own problems, and we all need to do our best to keep our problems local.

Foot Traffic

Here a large truffle has been stepped upon, or hit by a wheel during Autumn slashing in 2014. It was a surface truffle, ~300grams, substantially exposed to risk from feet and insects, the pressure cracked it open, exposing the interior and it then rotted.
This happened despite best efforts to keep our traffic away from high risk regions around known producing trees. This truffle was on a new tree and an unexpected 150 cm from the tree, which is unusual as first truffles generally appear next to the trunk.

What can we do?
Please follow any requests of truffle, wine growers etc. regarding footwear and other precautions, and only walk where instructed while on farm, this partially reduces the risks to the grower. Utilise any provided disinfectant baths both entering and exiting the property.

2014 preparation underway

The 2014 season is looking great! Recent pruning work in the truffiére has found a significant number of newly producing trees. Some have had long existing brulé yet no truffles until now. These have already revealed themselves, although current focus is on pruning, yet to come is the tending of the ground around the trees which typically discloses many truffles to an experienced eye.

Bear-&-Lani — Bear introducing Lani to the truffiére (and hazelnuts)

Assisting this effort has been the delightful company of our truffle dog trainee, Lani. She is an Italian dog breed, Lagotto Romagnolo, which roughly translates as a “Lake dog from the Romagna region”, where they were traditionally used as water retrievers, and more recently as truffle dogs.
She is a highly energetic dog, on the go (hunting) all day long and not dissuaded in the least by wet weather. Hopefully we can redirect this drive into finding truffles, with the willingness to work in wet weather definitely being beneficial to our July/August harvest season.

Current training sees her already walking without a lead out front by several metres, returning to heel at command. This will be quite useful in avoiding lead entanglements in trees. Next will be some scent location on command exercises.

Truffle Hunt 2013 with Chateau Yering

EDIT: For information on this seasons truffle hunts, https://www.yarravalleytruffles.com.au/truffle_hunt.html

The hunt in conjunction with Chateau Yering was conducted with two separate groups. We were fortunate the rain held off until after the last bus left.

Both groups found a nice truffle, but the random nature of truffle harvesting was amply demonstrated by the day’s/year’s best truffle being unearthed after the final bus left! If only we’d gone to that tree first! https://youtu.be/Z8O5qpriioU

After covering the basics on truffiere establishment, truffle life cycle, and a few questions, each group got to experience first hand the aroma arising from the soil around a ripe truffle.

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