What Is Copper Fungicide?
Copper fungicides are chemicals used to kill fungi, which cause diseases such as black spot or rust spots on fruits and vegetables. They have been widely used since the early 1900’s and they are still being used today. Today, copper fungicides are available in different forms: granules, liquids (such as vinegar), sprays (like Roundup) and dusts (as in those sold over the counter at drug stores).
Copper fungicides are effective against several types of fungus including white mold, brown rot, leaf spot, stem borers and root knot nematodes. Copper fungicides are also useful for controlling aphids, scale insects and mealybugs.
How To Apply Copper Fungicide For Fruit Trees?
The best time to apply copper fungicide is during the dormant season between May and September when fruiting conditions occur. However, it is possible to use copper fungicide during other times of the year if necessary.
When applying copper fungicide, make sure that there are no standing water droplets on your plants or nearby surfaces. If you do not want to risk damaging your soil with a sprayer, then simply pour some of the solution into a bucket and place the plant directly on top of it. Then, pour the solution directly on the roots. This works well if you are treating only a few plants.
What Are The Different Types Of Copper Fungicide?
There are several different types of copper fungicides that, while all effective, have slightly different uses. In order to choose which one is right for you, simply consider your situation and what your goal is. If you want to prevent signs of fungal infestation in your tomatoes then go with a preventative spray. If you already have some signs of a problem then you’ll probably want one of the others.
Copper Hydroxide: This type of copper is most effective when used preventatively. It forms a protective barrier on the plant and helps prevent disease from occurring in the first place. Since preventing damage is always preferable to curing it, this is the preferred variety for people who don’t like using chemicals.
Copper Sulphate: Also known as “Bordeaux Mixture,” this type of copper is much more effective if used after a disease has already broken out. It is characterized by the chemical reaction that occurs when the copper sulfate comes into contact with the moisture in the plant. Because it is so effective at killing off fungus, it should only be used during an active infestation and not as a preventative measure. This type of copper is also relatively cheap to buy.
Liquid Copper: Liquid copper works in both the preventative and curative areas of treatment. In addition to killing fungus, it also promotes healing in plants that already have signs of disease. It is especially useful for getting rid of downy mildew and blight. It should be noted that this is not a preventative spray so you can’t just start using it on your plants without having a specific need to do so. It should only be used when you have already found a problem.
Slow Release Copper Fungicide: While all of the above types of copper fungicides are effective for treating diseases in plants, they all have one weakness in common. After they have been absorbed by the plant, their effects wear off after a certain period of time. If a fungal infection comes back after the initial treatment, you’ll have to reapply the spray. Slow release copper fungicide is different in that it slowly releases copper into the plant over a period of several weeks or months. This allows the chemical treatment to last much longer and gives the plant a continual defense against fungal diseases.
Sources & references used in this article:
Microbial and enzyme properties of apple orchard soil as affected by long-term application of copper fungicide by QY Wang, DM Zhou, L Cang – Soil Biology and Biochemistry, 2009 – Elsevier
The potential impact of long-term copper fungicide usage on soil microbial biomass and microbial activity in an avocado orchard by G Merrington, SL Rogers, L Van Zwieten – Soil Research, 2002 – CSIRO
Hemocytic Lysosome Response in the Snail Helix aspersa After Exposure to the Fungicide Copper Oxychloride by RG Snyman, SA Reinecke, AJ Reinecke – Archives of environmental …, 2000 – Springer
In vitro antifungal efficacy of copper nanoparticles against selected crop pathogenic fungi by P Kanhed, S Birla, S Gaikwad, A Gade, AB Seabra… – Materials Letters, 2014 – Elsevier
Cellular biomarkers of exposure to the fungicide copper oxychloride, in the common garden snail Helix aspersa, in Western Cape vineyards by RG Snyman – 2001 – scholar.sun.ac.za
Copper contamination of soil and vegetation in coffee orchards after long-term use of Cu fungicides by HP Burchfield, A Goenaga – Contr. Boyce Thompson Inst, 1957
Refined pine tar oil for orchard and garden use by JØ Loland, BR Singh – Nutrient Cycling in Agroecosystems, 2004 – Springer
Control of taro leaf blight using metalaxyl by ER DeOng – Journal of Economic Entomology, 1931 – academic.oup.com