5 ways to prevent large animals damaging your fruit trees

We’ve written in other blogs how to identify which animals might be causing damage to your fruit trees, but it’s also important to think about strategies for preventing the damage!

In the case of big animals, it’s usually a case of protecting the trees using either tree guards, fences or netting enclosures.

A wire netting enclosure built to keep kangaroos away from a young fruit tree
A wire netting enclosure built to keep kangaroos away from a young fruit tree

Which of these you choose will depend on:

  • the specific pest damage you’re trying to prevent;
  • the size and age of the trees; 
  • whether you need a permanent or temporary solution; and/or
  • your capacity to buy or build something in terms of ability, time, materials and money.

So, while it’s impossible for us to give solutions for every specific situation, here’s our 5 top strategies:

  1. Deterrents: Once you’ve identified the pest, do some research into what they don’t like, and consider whether you can make the environment unpleasant for them. For example, hares are herbivores and are put off by the smell of meat, so a paste made out of animal fat and strong-smelling herbs applied to the trunks, or blood and bone scattered around the trees, may be enough to put them off.
  2. Tree guards: These can range from the simple corflute guards we use on the farm, which are fantastic because they’re durable and reusable (but have the disadvantage of not being wide enough to enclose the low branches, so they only protect the trunk) to a larger and more durable type of guard, which has the disadvantage of being more expensive and time consuming to build, and limiting easy access to the tree.
  3. Fences: Installing permanent fences to keep out animals like kangaroos, deer, hares or rabbits is an engineering challenge, and can be quite costly. However, if you’re serious about food growing it’s a fantastic investment and will pay you back many times in terms of protected future crops. Once you’ve identified the problem animals, do some investigation into the type of fencing recommended to keep them out; for example, a kangaroo exclusion netting fence needs to be at least 1.5 – 2.0 m tall, and is more effective if electrified. Deer fencing works best if a double fence is installed, and rabbits and hares will dig under a fence unless the bottom is protected with buried mesh. 
  4. Netting enclosures: These are a wonderful idea, and can serve the dual purpose of keeping out both larger animals as well as birds, fruit bats, and even possums. The one in the photo below (which we saw at Kalangadoo Organics) is made from PVC pipe. The walls are reinforced over the bottom half with chicken wire, with bird netting over the hoops at the top – a brilliant solution.
  5. Other animals: One of the natural predators of kangaroos and wallabies is the dingo, so a dog in the garden or orchard may keep them away.
A netting and fence enclosure protecting cherry trees  
at Kalangadoo Organics
A netting and fence enclosure protecting cherry trees
at Kalangadoo Organics

Building appropriate protection for your trees can easily become one of those jobs that keeps falling to the bottom of the ‘to do’ list, but in nearly every case it’s worth the time and energy. To help you bump it up the list, we’ve included some resources on building hoop net systems (such as the one above) in the short course Protect Your Crop From Birds.

The reality is, if you’re trying to grow food in an environment where lots of animals are hungry, you’ll need to build protection to make sure you get some. You may like the idea of sharing, but they don’t!

How to Prevent Leaf Curl

Leaf curl is a nasty fungal disease that affects peaches and nectarines, but it’s often confused for other things (well, other things are sometimes mis-labelled as Leaf curl).

Here’s what it looks like:

A peach tree with the classic red leaves of Leaf curl disease
A peach tree with the classic red leaves of Leaf curl disease

There are other things (both pests and diseases) that can make leaves curl in other types of fruit trees, but this particular pathogen only affects your peach and nectarine trees.

If you get a bad case, it can even affect the fruit, and really bad cases will make the fruit fail and fall off while it’s very small, before it gets a chance to grow. Notice how similar it looks to the disease on the leaves, with a rough, raised texture and the red colouring.

A nectarine infected by curly le
A nectarine infected by curly leaf

Why are we showing you what Leaf curl looks like in the middle of winter? Because if you saw any signs of this disease last year, now is the time to be treating your trees to prevent it happening again this year.

It might seem too early to be thinking about spring, but if you wait until you see the disease, it’s way too late to put out the preventive sprays.

A Goldmine nectarine bud swelling
A Goldmine nectarine bud swelling

The trigger to spray is bud-swell. Different varieties reach bud-swell at different times, which is where the skill comes in. Depending on where you live and which varieties you have, your trees may already have reached (or be past) bud-swell, but if your peach and nectarine trees still look completely dormant, that’s because they are. From now on you need to be monitoring each different variety so you can spray them at the right time.

Once you’re sure your tree has reached bud-swell, it’s time to apply a preventive copper spray – Bordeaux (which is made by diluting hydrated lime in water, and copper sulphate in water, then mixing them together), or a spray containing copper hydroxide are the best options for home use. The Better Fruit With Wise Organic Spraying short course includes a video demo of how to mix Bordeaux spray if you need more detail.

Field Trips Are Fun

Field trips to other people’s properties are one of the most effective ways of learning about farming (apart from actually doing it for a few years, of course).

Ant at his first ANOO conference, with Hugh and Katie
Ant at his first ANOO conference, with Hugh and Katie

We’re just back from ANOO 2019, the fifth conference of the Australian Network of Organic Orchardists.

We went back to the roots by returning to Tassie, where ANOO was born back in 2015, the brainchild of Michelle McColl from Kalangadoo Organics. It’s a pretty casual group – no committee, no office bearers, no bank account, and is based on two principles: it’s for certified organic commercial growers, and it’s a collaborative, information-sharing space.

Organic orchardists having a round table discussion at Willie Smith's Apple Shed, in the Huon valley
Organic orchardists having a round table discussion at Willie Smith’s Apple Shed, in the Huon valley

Even though no-one’s a complete expert, ANOO is a gathering of farmers who are problem solving every day to grow the best fruit they possibly can.

We all face the same issues and problems, but everyone puts their own interpretation on them and solves them in their own unique way, like Simon, who uses a flame thrower in his orchard to get rid of last year’s leaves and the Black spot spores they carry, without only minimal damage to the understorey – a brilliant solution!

Simon demonstrating the flamethrower he uses to kill black spot spores in his orchard
Simon demonstrating the flamethrower he uses to kill black spot spores in his orchard

Sometimes the learning comes from noticing the differences between the farms we visit and our own. And because ANOO is set up on the principle of openness and information sharing, we get to see and hear about everyone’s mistakes, as well as their successes.

Simon's undulating orchard on the side of several hills had Ant jumping for joy
Simon’s undulating orchard on the side of several hills had Ant jumping for joy

In Tassie some of the challenges most growers face is too much vigour in the trees, and too much grass in the orchard. We wish! It’s such a contrast to our semi-arid growing conditions, and our relatively low soil carbon levels.

So it’s reassuring to benchmark ourselves against others and and assess our yields, fruit quality, and disease management against what other people are getting. Ant should feel rightly proud of the success he’s achieved with Tellurian Fruit Gardens with a minimal amount of water, and good soil and nutrition management.

Ant giving the pigs what they love at Our Mates' Farm in Geeveston
Ant giving the pigs what they love at Our Mates’ Farm in Geeveston

We saw lots of examples of animals in orchards, which gave Ant the chance to compare the different management techniques he needs to use to look after his animals in our drier and more fragile environment.

The greatest value of ANOO (or other similar networks, like Mel talked about in her blog about the Deep Winter Agrarians gathering) is having a peer group of like-minded people who “get” what you’re talking about.

There’s not many places in the world we can have in-depth conversations about Codling Moth or Black Spot without the eyes of the person you’re talking with quickly glazing over!

Where are my bloody multigrips?
Where are my bloody multigrips?

Without fail, we learn something new to bring back for the farm, and for our Grow Great Fruit members, and this year was no exception – we’re buzzing with new ideas to share.