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What is Powdery Mildew?

Leo | July 26th, 2012

Powdery Mildew image

Powdery mildew starts as grey spots, and progresses to leaf necrosis (brown, dead spots)

Powdery mildew is a fungus that spreads easily, and can quickly destroy a garden. Powdery mildew is pervasive, it infests indoor and outdoor gardens, and significantly reduces crop yield. The good news is, with proper care powdery mildew infestations can be avoided.

What does powdery mildew look like?

Powdery mildew shows up as white, powdery spots on stems and leaves. As the spots spread, affected leaves and stems will slowly die. To prevent the spread of powdery mildew, it is important to sanitize the affected plant(s) as soon as possible. Do NOT try to remove the mildew spots before you sanitize the plant! It is very easy to spread powdery mildew this way.

There are several different species of powdery mildew, but they all thrive in similar conditions. Powdery mildew attacks flowers, food crops, and herbs alike; no plant is safe from infestations.

What causes powdery mildew?

Powdery mildew favors humid conditions with mild temperatures. Spores can be spread by the wind, dew settling on plants, and animals. Indoor gardens can become infected with powdery mildew from infected soil, spores that “catch a ride” on your clothes, and many other ways.

Dead plant matter can provide ideal growth conditions for some species of powdery mildew. Because of this, gardens should be kept clear of dead plant material. Dense leaf growth also provides lots of cover for powdery mildew.

How to prevent powdery mildew infestations

The most important thing you can do to prevent infestations is to sanitize your garden. Remove dead plant matter promptly. Always sanitize your garden tools before using them, and do not allow animals to enter your garden (since they can carry spores in their fur).

Plant hygiene is critical. The best way to maintain good plant hygiene is to use a plant wash. Plant washes sanitize plants, and are preferred over other methods because they leave no residue on plant leaves. With proper hygiene, powdery mildew has a hard time gaining a foothold on your plants

Herb Doctor can maintain the hygiene of your plants

Herb Doctor Super Plant Wash is specifically designed to maintain the hygiene of plants by sanitizing them. Herb doctor is a zero residue treatment that is gentle enough for daily use. Most growers that use Herb Doctor report that applying once every three days is enough to maintain the hygiene of their plants.

In dry climates, apply Herb Doctor at night. Plants love the superior hydration it provides. For humid climates, apply Herb Doctor in the morning. Make sure to get on top of and underneath the leaves for best results! With regular use, you can keep plants clean and prevent residues from building up that could cause problems like powdery mildew

Got Garden Problems? Call the Doctor! (800) 324-0297. We guarantee to keep your call and personal information strictly confidential.