Peach Scab Organic Treatment For Black Spots On Peaches
Black spots are a common problem on peaches. They may appear as small dark areas or they may cover the whole fruit.
Most commonly these spots occur on the undersides of the leaves but other parts of the fruit can have them too. These spots usually appear at night when there is less light reaching the skin so it’s not uncommon to see them during early morning hours. Black spots are caused by fungi called Phytophthora infestans. They cause the disease sporulation which means that they spread throughout the plant causing it to die back and eventually kill off all its life. If left unchecked, this disease will destroy your peach crop completely!
The best way to prevent black spots from appearing on your peaches is to avoid picking ripe peaches until after they’ve cooled down a bit before eating them. You can also try to keep the soil around your peach trees moist.
Fungus growth occurs when the temperature is warm enough for water to evaporate rapidly. So if you’re going to pick peaches, make sure you wait until they’ve cooled down a little bit before eating them.
Another thing that helps prevent black spots on peaches is using fungicides regularly. There are several different organic solutions that you can try.
For example, you can mix copper sulfate (a common fungicide) with a gallon of diesel fuel to create a spray. Be sure to wear gloves when you mix up this solution as it is not safe to handle. You want to apply this spray every two weeks during the time peaches are in season and continue using it until a week after the last peach has fallen from the tree.
Of course, the best way to prevent black spots on peaches is to pick them before they’re ripe. This means you’ll have to pick them as they appear on the tree but it will stop them from ripening too much while they’re on the tree and avoid the risk of spreading black spot.
Things You’ll Need:
When to Do It:
During the months when peaches are in season.
Why You Should Do It:
You’ll have delicious, ripe peaches without black spots on them.
Still Having Black Spots On Peaches?
Get Some Fungicide!
One of the reasons why you want to avoid picking your peaches until they’ve cooled down a bit is that once they’re picked they ripen up very quickly and this creates an environment perfect for black spots and other diseases to thrive in. If you’ve had problems with peach scab in the past or want to make sure your peaches are free from disease then you may want to use a fungicide.
Most fungicides are made using copper sulfate. You can either apply them as a spray or, if you’re only worried about one or two trees, drench the soil around the tree with the solution.
Either way you need to apply the fungicide between the months of March and October each year.
Other than spraying the peach trees, you can also drench the soil around your tree with a solution of copper sulfate once every month. You need to be careful when using this as if you use too much, it can kill your tree.
If you’re worried about disease then get your soil tested to see how much copper sulfate solution you need to apply before drenching the soil.
Things You’ll Need:
Watering Can or Other Container for Water
When to Do It:
During the months of March, April, May, June, July, August, September and October each year.
Why You Should Do It:
This helps to prevent peach scab from appearing on the peaches you grow on your farm. It also helps to prevent other diseases from attacking your crops.
Furthermore, if you use copper sulfate as a fungicide then it will help your plants grow more efficiently, meaning you’ll get more peaches and higher quality peaches. Also, your peaches will look better and be free from disease.
Things You Should Avoid:
Don’t allow sheep, goats or deer into the orchard while the trees are bearing fruit or after they’ve been bearing fruit. These animals have a habit of rubbing up against the trees and this can spread disease.
Step by Step Guide:
1. Put on your gloves and goggles before you do anything else.
2. Use the sellotape to divide each square of your propagator into sections.
There should be eight sections in total, separated like a grid.
3. Fill each section with the soil mixture until you create eight troughs.
4. Once you’ve filled all the troughs, water each one with two cups of water.
5. Take your peaches and remove any stickers that remain on them.
Place the peaches into the troughs.
6. Cover each peach with around one inch of soil mixture.
7. Place the propagator in a cool place (around 60 degrees is perfect) where it’ll get plenty of light but not be in the way.
8. Make sure to keep the soil in the troughs moist but not wet.
Do this by either using a watering can or leaving a saucer filled with water near the propagator so that moisture from the air will be absorbed.
9. Once the first bud appears on the tree, you can take the plant out of the propagator and put it in a place with lots of light but not direct sunlight.
10. Continue to water the plants and keep an eye out for pests and disease.
You can use the copper sulfate solution to prevent disease, but otherwise your plants should be fine as long as you keep on top of pest and disease prevention
Things To Avoid:
There are several things you need to avoid while growing peaches in order to get the best results.
You need to make sure that you don’t grow more than one variety of peach next to each other as different varieties can affect the quality of another.
Sources & references used in this article:
Comparison of reduced-application and sulfur-based fungicide programs on scab intensity, fruit quality, and cost of disease control on peach by G Schnabel, DR Layne – Plant disease, 2004 – Am Phytopath Society
Stone fruit diseases and their management by V Ram, LN Bhardwaj – Diseases of Fruits and Vegetables: Volume II, 2004 – Springer
Micronised and non‐micronised sulphur applications control peach scab equally well with negligible differences in fruit quality by G Schnabel, DR Layne, IJ Holb – Annals of applied biology, 2007 – Wiley Online Library
Flotation sulfur in agriculture by V Sauchelli – Industrial & Engineering Chemistry, 1933 – ACS Publications
Peach scab and its control by K Khosla, SS Bhardwaj – Plant Disease Research, 2010 – indianjournals.com
Evaluation of hydrophobic and hydrophilic kaolin particle films for peach crop, arthropod and disease management by N Lalancette, RD Belding, PW Shearer… – Pest Management …, 2005 – Wiley Online Library