Protectant (contact) fungicides are an important component of the fungicide program recommended for managing powdery mildew in cucurbits. They play a critical role in delayingdevelopment of resistance to systemic fungicides. The fungus causing cucurbit powdery mildew has an established track record worldwide of being able to develop resistance to systemic fungicides. Most systemic fungicides are at risk for resistance development because they have single-site mode of action. Thus modification of one gene in the pathogen may be enough to enable the pathogen to resist the action of the fungicide. Most protectant fungicides are not at risk for resistance development because they have multi-site mode of action.

Their role in resistance management is to control both sensitive and resistant strains thereby reducing the overall size of the pathogen population subjected to the resistance-selecting action of the systemic fungicides. Systemic fungicides are essential for managing powdery mildew on the underside of leaves to avoid premature death of leaves.Therefore, managing resistance to prolong the utility of systemic fungicides is very important. It is important to recognize that the goal of resistance management is to delay development of resistance rather than to manage resistant strains; therefore, resistance management should always be a component of powdery mildew management. For more information, see the on-line articles on resistance.


Powdery mildew is the name given to a group of diseases caused by several closely related fungi. Their common symptom is a grayish-white, powdery mat visible on the surface of leaves, stems, and flower petals. There are many hosts, and although this disease is not considered fatal, plant damage can occur when the infection is severe.

Powdery mildew is one of the most common fungal issues afflicting home gardeners and farmers alike. Its symptoms are easily spotted; however, it can spread to the point of being out of control quickly. The term “powdery mildew” encompasses a range of related fungal species which all possess similar symptoms , but each target specific hosts. Beans, cucumbers, roses, tomatoes and zucchini are highly susceptible to powdery mildew infection. Thankfully, all variations of powdery mildew are easily distinguishable from other fungal diseases, generally not fatal to the plant and have many treatments available to choose from.

Uses/benefits of Powdery Mildew Fungicide

Formulated to attack powdery mildew spores immediately, Powdery Mildew Killer is the ultimate treatment to powdery mildew invasions that potentially destroy valuable crops and harvests. Whether it’s an indoor hydroponic garden or a well-established winery, powdery mildew can wreak havoc on a property. With an auxiliary blockade of protection against present and potential epidemics of powdery mildew, Powdery Mildew Killer has a two-fold effect on crops: preventative and curative. It retards spore germination, germ tube growth, and destroys pathogen cells. Powdery Mildew Killer induces an imbalance in levels of the K+ ions inside the mycelium; this also helps to slow spore germination and mycelium proliferation. It enters the pathogen cell causing cell lysis

Features of Powdery Mildew Fungicide

  • MAXIMIZE YIELDS – Grow healthier plants with Grower’s Ally Fungicide spray. Our natural fungicide and bactericide for plants kills and prevents common plant pathogens, including powdery mildew.
  • ZERO POLLUTANTS – Formulated with food-grade citric-acid, our formula is FIFRA 25(b) exempt and OMRI Listed for use in organic gardening. Grower’s Ally tests clean and contains no residual solvents, no synthetic pesticides and no heavy metals.
  • KILLS AND PREVENTS POWDERY MILDEW – Our broad-spectrum citric acid fungicide is an effective natural disinfectant. It reduces bacterial growth yet is gentle on plant tissue. When this plant disease control spray is used as a preventative treatment, citric acid forms a protective barrier on the surface of the leaves to inhibit pathogen development.
  • HARVEST SAME DAY – Grower’s Ally disease control for plants can be safely applied through all stages of plant growth, from clones through the flowering cycle when many problems occur.
  • RECOMMENDED BY CULTIVATORS – Our foliar spray is trusted by large scale growers and suitable for use in all grow environments and cultivation facilities: indoor, outdoor, greenhouse, hydroponic.

Mode of action

Formulated with citric acid, our natural fungicide spray forms a protective barrier on the leaf surface that inhibits pathogen development. It also has anti-fungal effects to reduce bacterial growth and prevent disease on plants.

Prices of Powdery Mildew Fungicide


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