Most effective tips to deal with powdery mildew on grape

If you grow grapes,you may reaching to see a white powdery substance on the grape leaves.It’s the grape powdery mildew. Especally in main grapevine growing area such as Americas,Europe and Australia.
The disease seems as a whitish-gray powdery coating on the leaves or fruit caused by plant mycelium and conidia on the surface of the plant.
On leaves, initial symptoms seem as chlorotic spots on the leaf surface that presently become whitish lesions.
While this can be common,it’s a disease which will injury your grape plants and your crop if left untreated.

powdery mildew on grape

Manual management

Disease development is powerfully favored by high humidness and cloudy weather, additionally to comparatively heat temperatures.
Manual management of powdery mildew helps prevent the disease from overwintering in bark crevices and also the spread of current infections. powdery mildew infects leaves, shoots, bark and developing fruit on grapevines, releasing spores in spring throughout heat, wet conditions. Removing morbid leaves and shoots as they seem and removing dead material at the end of the season helps prevent powdery mildew spreading and overwintering on plants. Spring pruning removes additional potential sources of infection. Prune grapevines once hard frosts are over, cutting away all canes except one or two young, unfruited canes eight to ten buds long on either side of the grape trunk. Tie these to supporting wires.


Sulfur, oils, soda and biological managements are available to the house gardener for powdery mildew control. Apply sulfur before symptoms appear, using a product with additional surfactant to assist the sulfur stick to plant surfaces. you’ll also apply horticultural oils, neem oil and jojoba oil as a protectant or to eradicate existing infections. Sulfur and oils ought to never be applied together or within two weeks of each other, and neither ought to be used once temperatures exceed 90 degrees fahrenheit. 
Biological powdery mildew management contains Biofungicide Trichoderma harzianum, that helps control powdery mildew infections spreading.It also have good effect on building a healthy soil condition for plant growth.


Fungicide applications to manage powdery mildew ought to begin before flowering and continue while conditions for infection are favorable. Spray a protectant when flower buds are full and close to burst, wetting all plant surfaces however not saturating them, which causes the antifungal agent to drip off. Repeat the spraying every ten days if last season’s disease was severe. Intervals between spraying may be prolonged if symptoms do not appear. If mildew takes hold, continue spraying until leaf fall to help reduce next season’s infection rates. Spray with ready-to-use fungicides or dilute in step with manufacturers’ directions.


Growing grape varieties resistant to mildew and providing appropriate growing conditions will facilitate eradicate powdery mildew infections in home garden grapevines. Some grape cultivars, like Traminette, Canadice, Cayuga White, Norton, Ives, Marquis, Mars and steuben are resistant to mildew. Growing resistant varieties, well-spaced apart in open, sunny areas ought to reduce infection rates. If leaf cover is thick, expose developing grapes and improve air circulation by removing leaves at the bases of the stems.

Some interesting solution

This solution was developed specifically for zucchini by a Brazilian person. His analysis triggered an organic gardener and vintner who try the milk mixture on his vineyards. And guess what? It worked there !
It is effective and it’s non-toxic. Spraying in full sun works the best. Spray once a week but don’t spray more often than that because it will cause another kind of mold to grow on your plants.

More info of powdery mildew:http://bit.ly/powdery_mildew
Our blog site:www.doraagri.com


How to get rid of powdery mildew on rose?

Rose ,so romantic and lovely.It is really a pleasure to plant roses.Today when you come to your beloved rose bushes, you are surprised to find that your lovely roses are covered by a dusting of white powder on buds,stems and leaves.These white powder makes your roses,once beautiful and heathy,look sick and ugly.Turns out that your roses have powdery mildew.

powdery mildew on rose
powdery mildew on rose

What is Rose powdery mildew?

Rose powdery mildew is a fungal disease.The fungus produces spores which are spread by the wind.Fortunely,it’s very easy to figure out that whether your roses have powdery.If your roses have powdery mildew,you would find out white or grey powdery spots on the buds,leaves, stems or even.When the disease is mild,the growth of rose would be weakened, the young leaves are distorted and deformed,and the flower posture grows irregular, which affects the growth and loss of ornamental value.When the disease occurs severely, it causes early deciduous leaves of rose, deformity or incomplete opening of flower buds, and consecutive diseases make the branches of rose wither or the whole plant die, seriously affecting its quality and yield.

How to prevent rose powdery mildew?

Rose powdery mildew grows well in environments with moderate temperatures and high humidity.Sounds familiar?Actually greenhouses are ideal environments for rose powder mildew to speard because of their high humidity and moderate temperatures.Of course i’m not telling you not to use greenhouses.To prevent powdery mildew ,you should ventilate your roses and increase the light conditions.High-density means high risk of diseases.With the increase of planting density,the condition of ventilation and transmittance getting worse,which makes fungi easier to spread.So don’t plant your roses in high -density.

1.Remove the infected parts

Donnot hestitate to remove the infected parts of roses after you find out powedery mildew.Throw the infected leaves and twigs away,don’t give these trash chances to infect healthy ones. Also, be careful not to touch healthy leaves with your pruning shears so as not to spread the disease .After pruning,don’forget sterilizing your pruners with rubbing alcohol.

2.Homemade preventation

Milk has been proved by many gardeners to be effective in treating powdery mildew of roses.You can dilute the milk with water (typically 1:10) and spray on roses at the first sign of infection, or as a preventative measure.
Baking soda is also a solution to preventing rose powdery mildew.Use about 3 teaspoons of ordinary baking soda for each gallon of water.It do prevent it from spreading to healthy leaves and allow the rose to recover.

3.Chemical fungicide

A.Triadimefon is a fungicides with high efficiency, low toxicity, low residue, long duration and strong internal absorbability.It can be sprayed with 1000–1200 WP of 15% wettable powder, 1 times intervals of 10 days, and 2–3 times.
B.Trichoderma harzianum is a also good choice used on rose to control fungus disease with no toxicity and residues.It also can help improve soil condition.More suitable for organic garden.


Amino acids and nitrogen liquid fertilizer

General Information

Dora Amino 30 liquid is amino acids liquid fertilizer containing many kinds of L-Amino acids to provide an instant energy boost during the whole stages of root system development, flowering and fruiting for all crops.


Free Amino acids≥30%(w/v)
Appearance:dark brown liquid
Density1.25g/ml Total Nitogen≥8%
pH4.5–5.5 Shelf life2 years

Why choose Dora Amino 30 liquid ?

Significantly helps increase the rate of photosynthesis enabling plants have a good performance during the whole growth period.
Help plants increase the uptake of micronutrients(e.g. Fe, Zn, Mn, Cu) because amino acids is a highly effective natural chelating
It is also recommended as a 100% water soluble organic nitrogen fertilizer for fertigation (drip irrigation) and hydroponic irrigation systems.
Widely used as a foliar fertilizer in combination with water soluble fertilizers and almost all commercial plant protection agents to enhance their efficiency.
  • Plant growth promoter,Increases crop growth and yields.
  • Promotes the ripening and colouring process in fruit.
  • Improve the quality and shelf-life of fruit and vegetables.
  • Stimulate plant resistance to stress
  • Improves soil buffering capacity

How to use Dora Amino 30 liquid ?

Foliar Application : Mix 3- 5 ml Amino 30 Liquid in 1 L of water and spray.
Drip Irrigation : 2–3 L/ha
Suitable for application on cereals ,rice, beans, fibre crops, sugar crops, plantation crops, vegetables, fruits, flowers, orchards and ornamentals,etc.


What's fungicide ?

Plant disease is the main enemy of agricultural production. According to the Food and Agriculture Organization of the United Nations (FAO), the average annual loss of production due to plant diseases is 10% to 15%.
At present, the main means of controlling plant diseases is chemical fungicides. However, due to potential human health hazards, environmental pollution, non-target organisms, and development of plant pathogen resistance, the development of chemical fungicide has been limited. Biological fungicide are attracting more and more people’s attention and interest.

What’s Biofungicides?

Bio-sourced fungicides refer to the direct use of biologically active substances produced by biological organisms or biological metabolic processes or substances extracted from organisms as a disease prevention and treatment. The concept of biological pesticides is vague and can be considered equivalent to biologically derived fungicides.
According to statistics, there are more than 100 kinds of biological pesticides products in the world, but more than 90% are bio-insecticides. The next important commercial bio pesticide will be a bio fungicide.
The bio fungicide currently developed are basically microbial fungicides of bacteria, fungi and antibiotics, mainly including agricultural antibiotics, bacterial fungicides, fungal fungicides and viral fungicides. Microbial fungicides mainly inhibit the energy production of pathogens, interfere with biosynthesis and destroy cell structure, have strong compatibility and low toxicity, others also have the effect of stimulating plant growth.

Kinds of Biofungicides

Agricultural antibiotics

Agricultural antibiotic bactericides are secondary metabolites produced by microbial fermentation processes that inhibit or kill plant pathogens and regulate crop growth and development at low concentrations. For example, Kasugamycin, Jinggangmycin, Polyoxymycin and Streptomycin. At present, agricultural antibiotic fungicides are the leading force of biocides.

  • Bacteria fungicide

In recent years, people have gradually recognized the important role of Gram-positive bacteria in biological control. In particular, Bacillus spp. has a wide variety of resources and abundant resources. The formation of spores makes them adaptable and resistant to stress, easy to industrialize production and storage, and has great potential for application. Bacillus subtilis has a good control effect on the plant pathogenic bacteria Fusarium and Rhizoctonia, and at the same time has the functions of preventing disease and promoting crop growth.
Because of the variety of bacteria, large quantities, rapid reproduction, and easy artificial culture and control, the research and development of bacterial fungicides has great prospects.

Fungal fungicide

The most widely studied and applied fungal fungicides are Trichoderma spp. The inhibition of phytopathogenic fungi by Trichoderma has been discovered. It has good effect on resistance to various diseases such as blight, sclerotinia, pythium and botrytis. It has a good market prospect.

Advantages of Biofungicides

  • Strong selectivity and safety for humans and animals. At present, most of the bio fungicides developed and widely applied in the market have effects only on diseases, such as humans, animals and various beneficial organisms (including natural enemies of animals, natural enemies of insects, bees, pollinators and aquatic organisms such as fish and shrimp). It is safer and has less impact on non-target organisms.

  • The impact on the ecological environment is small. The biological fungicide mainly uses the special disease prevention and growth promoting function of certain special microorganisms or metabolites of microorganisms to achieve the control effect. Its effective active ingredients are completely present and derived from natural ecosystems. Its greatest feature is that it is easily decomposed by sunlight, plants or various soil microorganisms. It is a way of material circulation that comes from nature and belongs to nature.

  • Production and processing of agricultural and sideline products can be utilized. At present, domestic production and processing of biological fungicides generally use natural renewable resources (such as corn, bean cake, fish meal, wheat bran or some plant bodies). Therefore, the production of biofungicides generally does not create conflicts with the use of non-renewable resources (such as oil, coal, natural gas, etc.) to produce chemical synthetic products for raw materials, and is conducive to the protection and permanent use of human natural resources.


6 ways to stimulate plants root growth

Root growth is vital for plants growth.It’s responsible for the absorption of nutrients and water, as well as controlling the physiological activities of the aboveground organs.

6 ways to stimulate plants root growth

1.Adjust the soil pH of the plough layer

Unreasonable fertilization for many years leads to changes in the pH value of the plough layer, which is the root cause of today’s soil problems. Our recommendation is to use a special soil conditioner according to the actual situation after testing the pH of the plough layer.

2.Adding biological fertilizer(Such as Trichoderma harzianum)

The application of biological fertilizer can improve the soil condition, they are suitable to be applied on soils problems with salinization,hardening and acidification.Significantly improve these soil condition and promote the growth of root system, and can control harmful bacteria and fungus or other organisms to reduce plants soil borne diseases, and increase plants the yield and quality.

3.Add organic matter

Organic matter is the top choice for fertile soil. Its role is to loosen and breathe, forming build soil crumb structure, retaining water and protecting fertilizer, increasing microbial activity and promoting root development.

4.Rational irrigation and drainage

It is recommended to adopt small water pouring or micro-irrigation or drip irrigation to protect thecrumb structure of the soil and facilitate root growth. For crops, rainy season drainage system is as important as the irrigation system, both to prevent flooding and to prevent dead roots.

5.Choose a functional product

Functional water soluble fertilizer contains humic acid or amino acid, which has positive significance for supplementing organic matter, improving ground temperature, improving soil permeability, improving fertilizer utilization rate, and promoting roots.

6.Cultivating loose soil

There is a proverb saying “There is water and fire under the hoe,” which means that the shovel (cultivating the soil) can improve the drought tolerance of the crop (with water) and effectively increase the ground temperature (with fire). Especially in the seedling stage of crops, root development is not yet complete, and cultivating loose soil is one of the indispensable measures to improve ground temperature, enhance soil permeability and promote root development.