Common name: Sage powdery mildew
Scientific name: Different species of the order Erysiphales
Type: fungal
who am I?
Sage powdery mildew is a fungal disease spread throughout the world and usually appears on the surface of leaves in the form of white or gray spots with a powdery texture, hence the name.
In general, the disease is host-specific, meaning it can only infect plants of the same genus or family.
Powdery mildew prefers warm climates, moderate to high humidity and low light conditions and does not require self-standing water.
Powdery mildew can cause significant losses due to nutrient extraction, decreased photosynthesis, increased respiration and transpiration, poor esthetics, and overall slower growth rates in sagebrush.
Prevention measures
It is easier and more cost effective to overcome infection by controlling powdery mildew during its initial stage. Make it a routine to monitor the field regularly and check for the presence of powdery mildew weekly.
Sewage
In most cases, it is helpful that powdery mildew is generally host-specific; There is little concern regarding neighboring crops that have been neglected. However, it is important to remove all debris from the outbreak. Otherwise, it can affect sagebrush plants the following season. There are many powerful commercial fungicides and the amount of inoculum from last year's outbreak is of great importance.
Simple sanitation measures are an important step and should be the basis of plant protection programs.
Traditional methods (chemical)
There are differences in the dynamic nature and behavior of powdery mildew on different hosts. Growers and consultants tend to have their own treatment methods, different methods, fungicide preferences and secret tricks. However, there is still some consensus: prevention, rotation, and use of several fungicides each belonging to a different group of chemicals.
Effective control requires spraying with high pressure and a large volume of water; Good coverage is of the essence. Having a fixed or dynamic spray application schedule is a common strategy.
Below is a list of generic names of fungicides used in one or more parts of the world, classified into groups according to mode of action:
Group 1: penconazole, triadimenol, tebuconazole, myclobutanil, tetraconazole, propiconazole, prochloraz, cyproconazole, difenoconazole, fenbuconazole, and triflumizole.
Group 2: Azoxystrobin, Pyraclostrobin, Trifloxystrobin, and Crisoxime Methyl
Group 3: Sulfur, copper sulphate, bicarbonate, mineral oil, neem oil, detergents and soap-based products
- Sulfur can cause injury to foliage and fruit when used on days when the temperature is higher than 32°C. Do not use it within two weeks of using the oil.
- If powdery mildew is present, but no symptoms appear, consider spraying fungicide once every 14 days. Products containing the same active ingredient are not used in successive treatments except in group 3, as there are no restrictions.
- Use fungicides belonging to different groups to prevent powdery mildew from developing resistance to certain chemicals. It is important to remember that if powdery mildew develops resistance to fungicides within a group, the pathogens are likely to be resistant to all members of that group (except group 3).
- Some commercial fungicides have two active ingredients and two modes of action. After using these products, keep in mind that you now have two sets that you have already used. So, make sure to exclude these two active ingredients in your next application.
organic
Sulfur (dusted, wettable, flowable, or micronized) and potassium bicarbonate may be used.
biological
Bacillus pommelis and Bacillus subtilis.
Note: Caution and careful observation should be used when using any plant protection products (insecticides, fungicides, herbicides). It is the grower's sole responsibility to keep track of legal uses and permissions regarding laws in their countries and destination markets. Always read label instructions and, in the event of a discrepancy, act in accordance with the product label. Keep in mind that the information written on the label usually applies to local markets. Pest control products for organic farming are generally less effective than conventional products. When dealing with organic, biological, and to some extent a small number of conventional chemical products, complete eradication of a pest or disease will often require several repetitions of a specific treatment or combination of treatments.
- the reviewer
- https://www.saillog.co/
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