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.

Diagnosing leaf curl in summer

The dreaded Leaf curl disease on a peach tree

We want to talk about Leaf curl. It’s a common fungal disease of peach and nectarine trees (if you have leaves curling in other types of trees it’s caused by something else).

It may seem strange to be talking about it so late in summer, as it’s a disease that shows up in spring, but bear with us!

If you noticed the disease in your trees last spring, the trees should have completely recovered by now, and grown lots of healthy new leaves (that should look something like the photo below).

Hugh with a healthy young peach tree

However if you’re not sure whether your trees had the disease, it may still be possible to find out, as you may still have remnant diseased leaves in your trees.

They’ll look something like this:

Remnant dead leaves from Leaf curl infection in peach tree

In fact, this can be one of the dignostic tools you can use to help identify whether you had this disease in your trees, in the ongoing detective work we need to be doing to become awesome fruit growers!

These dead and shrivelled leaves are a powerhouse of fungal spores sitting in the tree, just waiting until conditions are perfect next spring to release the spores, and start the disease cycle all over again.

A fresh Leaf curl infection on a peach tree in spring

It’s been often and hotly debated whether it’s worth removing infected leaves from the tree as they emerge in spring, and the answer seems to be no, it doesn’t help reduce the spread of infection once it’s started.

However, the jury is still out on whether removing the remnant leaves in summer will help prevent re-infection the following spring. As always, we err on the side of caution when it comes to practical, hands-on jobs you can do to help your trees stay healthy.

So…get rid of them! Many of these leaves will probably have fallen off of their own accord and rotted away under the tree, but if there are any still in your trees, remove and dispose of them.  

Hot compost is the perfect disposal method, as the high temps reached will kill off the fungal spores, but the organic matter in the leaves won’t go to waste.

Remember, prevention is much better than cure, and hygiene is one of the best defenses we have against all pests and diseases.

Another strong defence is using allowable organic sprays in spring, but it only works if you get the timing right. We’ve included a complete spray program to help you decide what and when to spray in the short course Better Fruit with Wise Organic Spraying.