Spring spraying

In organic growing we don’t use chemicals that damage the produce, people or the environment, but that doesn’t mean we don’t spray!

Pink Lady apples with Black spot
Pink Lady apples with Black spot

All deciduous fruit trees are prone to fungal diseases, some more than others, and if they’re not properly prevented or controlled in spring, they can be devastating.

We don’t have room here to go into a lot of detail about individual diseases, so we’ll focus instead on the basic principles of fungal disease prevention.

Each fungal disease has trigger points that stimulate an outbreak of disease – a unique combination of temperature, the number of hours the tree has been wet, and the amount of spores present, amongst other things (we go into more detail about individual diseases in the Keep Your Fruit Trees Free from Disease short course).

Regardless of the disease we’re trying to prevent, the aim is to keep your trees protected at all times while they’re flowering with what we call a “cover spray”

This means we’re aiming to have the trees covered with something that will prevent the fungal spores from causing a disease outbreak.

The regime differs a bit depending on what disease is posing a risk, but the same principles apply. Put an organic fungicide spray on, and then if you’ve had a lot of rain (more than about 25mm, or consistent rain for days on end) assume it’s been washed off and replace it.

Mixing Bordeaux spray
Mixing Bordeaux spray

An effective spray available to organic growers is copper, normally mixed with builders lime (when it’s called a ‘Bordeaux’ mix).

However as always, it’s important to consider the pros and cons. Copper is such an effective fungicide that it can have quite a detrimental effect on the soil because it kills the soil fungi, which are vital to the health of the soil and your trees. So, our compromise is that we only ever use copper once or twice a year.

Peach buds covered with copper spray
Peach buds covered with copper spray

In an ideal world, the tree’s natural defense system (including naturally occurring microbes on the leaves) would prevent a disease outbreak, but for many growers, their trees still need some protection.

Another spray we can use in organic orchards and gardens is sulphur, which is much ‘softer’ and less damaging to the soil, but also less effective at preventing outbreaks of disease. It’s likely to get washed off by rain more easily though, so it may need replacing more often.

Whey is another spray that is often recommended for organic fruit trees, but we’ve not used it ourselves and it’s hard to get any good data about its effectiveness. If you plan to use it please do some ‘citizen science’ and keep good records (including photos) of what you use, when you use it, and your results – and then send them in to us, we’d love to see them and share any new-found knowledge.

On a side note, one of the orchards in the Australian Network of Organic Orchards reported back on a trial he did with potassium silicate and potassium bicarbonate to prevent Black spot fungal disease in apples – and it was almost a total failure! So be warned, if you’re trialing an unproven product set up a small controlled experiment rather than risking your whole crop.

Pruning in spring?

We’ve been getting lots of good pruning questions lately, so we thought we’d share some with you today.

Pruning plums that have started to flower - a good idea?
Pruning plums that have started to flower – a good idea?

1. Is it too late to prune now?
No, is the short answer.

Generally we prune most fruit trees (apples, pears, peaches, nectarines and plums) in winter while the trees are dormant, but as with all aspects of pruning – there’s no ‘right’ or ‘wrong’ thing to do, just cuts and consequences.

So, what are the likely consequences of pruning in late winter/early spring?

Pruning in winter encourages a strong growth response in the trees, and the later you prune the less the tree is likely to grow in response. If your trees have already broken dormancy when you prune them, you’ll be wasting some of the energy they will have already put into growth. But that may be better than leaving them completely un-pruned.

2. What’s the difference between a heading cut, and a thinning cut?
At the end of every branch or lateral (smaller side-branch) is an ‘apical’ or ‘terminal’ bud, and it releases a hormone that suppresses the growth of the buds below it. Any time you make a cut that removes the apical bud it’s called a ‘heading’ cut, and therefore the effect of a heading cut is to create branching. This is a very stimulating type of cut, as usually the 2 or 3 buds immediately below the cut will start to grow.

2 year old cherry tree responding to heading cuts

On the other hand, if you make a pruning cut back to a lateral, but leave the lateral intact – i.e. leave its apical bud in place, that’s called a ‘thinning’ cut.

This is a less stimulating type of cut, and is a good way to remove some wood from the tree without creating branching.

3. Should you remove all growth going into the middle of the tree?
Large branches that are going into the middle of the tree, especially high up in the tree, can create shading over the lower branches, and should usually be removed.

Very hairy fruit trees that need some central growth removed
Very hairy fruit trees that need some central growth removed

If there are a lot of large branches to remove, it’s a good idea to do it over a few years rather than all at once, because trees will try to replace all the wood you remove from them, and the aim is to keep the trees in balance between producing wood, and producing fruit, therefore aim to remove as little wood as needed each year, to create the shape you want.

However, small branches (or laterals) that are going into the middle of the tree usually do not need removing, and in fact can be very useful fruit-bearing wood.

In fact, removing all laterals that go into the middle of the tree is one of those “rules” that can end up doing quite a bit of damage to your tree, as it’s easy to create long bare patches on your limbs by removing these laterals, particularly low down in the tree where it’s easy to reach them. Those bare patches become wasted real estate, as you’ve effectively removed all the fruit growing wood – it’s one of the rookie mistakes we help you avoid in our Pruning Mature Fruit Trees short course.

Is it spring already?

Surely not … and yet … we think these peach buds on our Anzac peach tree might be starting to swell soon.

Early budswell on an Anzac peach tree
Early budswell on an Anzac peach tree

Anzacs are a great ‘indicator’ variety for us, because they’re one of the early varieties to show signs of movement in spring.

Almonds are another great indicator as they’re also very early. Rather than having to monitor the whole orchard, we just go and look at the Anzacs and almonds to see what’s happening.

Almond flowers at sunset
Almond flowers at sunset

If you have peach and nectarine trees in your garden or farm, it’s time to start monitoring them for budswell.

Why?

Because it’s the trigger for putting on a spray to prevent Leaf Curl, which is a fungal disease that can have devastating consequences, particularly for young trees.

Leaf curl fungal disease on a peach tree
Leaf curl fungal disease on a peach tree

A bad case of leaf curl can even affect the fruit.

A Goldmine nectarine infected with Leaf curl disease
A Goldmine nectarine infected with Leaf curl disease

The good news is, it’s (mostly) preventable. You can find details about how and when to spray in Keep Your Fruit Trees Free From Disease. This is one of our most comprehensive short online courses, and includes guidance on how to manage and prevent about a dozen of the most common diseases of fruit trees.