Premium Quality Demildex
Not all copper fungicides are the same. A number of brands are available and tests have shown they vary remarkably in the quality, reliability and consistency of formulation. When choosing the best copper fungicide to protect your crop, the most important things to consider are:
- copper content of the active ingredients;
- for environmental and health reasons impurities such as lead are important, as is,
- free copper (the culprit in burning plant tissue); and,
- particle size because it determines such key factors as plant coverage, the ability of the product to stick to the plant, suspensibility in the spray tank and ease of application.
Only High Quality Ingredients Go Into Demildex
All copper fungicides are manufactured using scrap copper. Product sourced from copper scrap results in the presence of impurities including heavy metals. The purity of the final product depends on the purity of scrap used. Demildex is produced using the highest quality copper scrap. Copper joiners (major contributors of heavy metal impurities such as lead) are removed. As a result, Demildex averages a very 73 ppm lead level, well below the international standard of 250 ppm.
Less undesirable Copper Chloride In Demildex
All copper oxychloride and copper hydroxide products follow the same production process whereby copper chloride is an intermediare compound. The level of copper chloride in the final product is directly proportional to the reaction (manufacturing) time.
Why This Is Important!
Copper chloride is highly undesirable because of its phytotoxic effects on plants. Symptoms include burning of the leaves or blemishes on the fruit. Because of the extra long oxygenation time with Demildex’s production process, this product has the minimal (0.05% to 0.09%) copper chloride levels. Other brands have tested copper chloride levels as high as 2%. The very low copper chloride content in Demildex is an improtant consideration for all crops, especially the more sensitive crops such as tomatoes.
Better Coverage For Superior Disease Control
Optimal particle size is a key factor in the outstanding performance of Demildex. Particle size is a term which refers to the average diameter of the particles in the product. Best performance comes from the 1 to 2 micron particles. The smaller the particle size the greater the number of particles – or active sites – per unit and hence the greater the fungicidal or bacterial activity. Products with larger particle size have less particles and hence a smaller area of active (fungicidal) surface.
Spray deposit illustrating coverage and number of particles:
Table of theoretical values for number of particles per gram and specific surface area:
The Particle Size Of Demildex Is Very Small With:
- 30% of particles below 0.5 micron
- 50% of particles below 1.58 micron
- 85% of particles below 3.0 micron
Comparing Demildex With Some Other Commonly Used Copper Products:
Demildex Sticks To The Plant Better
For fungicides, the tenacity coefficient is a measure of the product’s ability to stick to the plant and hence gives a strong guide to its resistance to weathering from rainfall or overhead irrigation.
The tenacity coefficient (and resistance to rainfall), increases with a decrease in particle size. Ultra fine Demildex sticks extremely well to the plant.
Reduced Label Rates Mean Cost Savings!
The fine texture and quality of Demildex means this product can be used at lower rates than the average copper oxychloride. Demildex label rates are similar to the hydroxide products making Demildex very attractive on a comparative basis.
Demildex is an ultra fine, low dust, wettable powder Copper Oxychloride fingicide containing 50% copper, Demildex is specifically formulated for horticultural application. Demildex’s unrivalled ultra fine formulation ensures:
- More complete suspensibility within the spray tank (the degree of suspension with Demildex has reached 89.19% – the upper physical limit for this type of product). High suspensibility ensures Demildex is kept in maximum suspension in the spray solution and eliminates deposits being left in the tank.
- No nozzle blockage when used as directed.
- Demildex has been especially formulated as a wettable powder with excellent flow characteristics to minimise dust and operator exposure.
Other Demildex Benefits:
- Demildex is not broken down by sunlight to remain active on the plant surface.
- Demildex is non corrosive when used as directed.
- Demildex is non abrasive. This is a function of the smallness of the particle size and the nature of the product.
- Demildex is conveniently packaged in 1 and 25kg bags. There are no drums to dispose of.
The Facts On Wettable Powders Versus Soluble Liquid Formulations
The following informatin was supplied by Professor J.M. Kotzê from the University of Pretoria, South Africa. Professor Kotzê is an international authority on copper compounds used as fungicides. These comments help to clear the debate as to the fungicidal effectiveness of soluble copper products.
“The fungicidal/bacterial properties of copper oxychloride is based on copper (the active ingredient) which is slowly disolved in moisture (rain or irrigation) on the plant leaf in the presence of weak organic acids. As plant infections take place during rain, small amounts of copper are released on the plant surface to kill or inhibit germination of micro-organisms.
Demildex is a protectant fungicide/bactericide which prevents infection on plants. Its mode of action is by interfering with the enzyme system of spores and mycelium, a process which is usually irreversible. It forms a chemical barrier against fungal attack.
Copper never controls plant diseases when absorbed into the plant. Soluble liquid copper products have very high and quick absorption by the plant.”
To sum up…
Demildex forms a chemical barrier which protects the plant tissue from fungal attack. It does not have any systemic fungicidal value.
If you’re not sure which product is right for you, feel free to get in touch for a free consultation.