I have a terrible problem every summer with powdery mildew on many of my plants. I live in the northeast. Any ideas?

I have a terrible problem every summer with powdery mildew on many of my plants. I live in the northeast. Any ideas?

Looking for suggestions to trat this problem and avoid it in the future. Thanks! Asked by zookeepr26 52 months ago Similar questions: terrible problem summer powdery mildew plants live northeast ideas Home > Patio, Lawn & Garden.

Similar questions: terrible problem summer powdery mildew plants live northeast ideas.

You don't say which plants have the mildew problem... ...and different fungi cause the problem on different plants. In addition, some of the treatments are harmful to some plants but not others. Nonetheless, here is some information for you.

For outdoor ornamental plants: 1) Gather up all fallen leaves in autumn and destroy them. 2) If you see it starting on just a few leaves, remove the affected leaves and destroy them ASAP. 3) During the growing season begin fungicide applications when the first white patches are noticed.

Repeat as indicated on the product label during cool humid weather. 4) Replace your most susceptible palnts with resistant varieties (if available). --------------------------------------------------------------Background informationThe fungi which cause powdery mildew are spread by spores produced in the white patches.

These spores are blown in the wind to other parts of the plant or to other plants during the growing season. Generally each species of fungus will be limited in the number of plant species that can be attacked. For example the species of fungus infecting lilacs will not cause powdery mildew on apples.

During the winter the fungus survives on infected plant parts and in debris such as fallen leaves. It may produce resting structures known as cleistothecia, which resist harsh winter conditions. These will appear as small black dots within the white powdery patches.

The next spring, sexual spores (ascospores) are released from the cleistothecia, shot up into the air, and carried by air currents to leaves of plants where new infections will begin. During the growing season, the fungus produces asexual spores (conidia) that help the fungus to spread and infection to build. This is the general cycle for most powdery mildews of outdoor plants.

There are several effective fungicides available for different sites and plants, but use on plants varies with each product, and not all fungicides registered for use to treat powdery mildew may be used on all plants. Be certain the product you purchase is labeled for the intended use, and follow directions on that label. Some products with a broad range of applications for outdoor ornamentals include products containing: Bacillus subtilis, jojoba or neem oil, potassium bicarbonate, sulfur or lime sulfur.

Some of these products may also be used to treat powdery mildew infections in the vegetable garden. Other products may also be available, so refer to the appropriate pest management guidelines or contact your local Cooperative Extension Office for more information. Management of powdery mildew on fruit trees may be combined with the normal spray schedule and should begin at the green tip bud stage for apples.In New York State, some products that may be available for use include: Bonide Copper Spray/Dust, Elexa-4 (chitosan), multi-purpose sprays, and some products containing the active ingredients: Bacillus subtilis, neem oil, thiophanate-methyl, potassium bicarbonate, or myclobutanil.

Wettable sulfur is known to cause injury to some plants. Check labels for cautions about sensitive plants. If thiophanate-methyl does not seem to be controlling the disease, do not continue to use it.

In some cases the fungus is able to develop a resistance to this chemical. Sources: http://plantclinic.cornell.edu/FactSheets/powdery/powdery.htm .

Pictures will tell if if this is what you have, then gives treatment if you don't want to use toxic chemicals , here is an alternative:greencure.net/and some seasons are worse than others, and some tips to prevent or control:treesforyou.org/Planting/InsectsandDisea... services are good sources of information:plantclinic.cornell.edu/FactSheets/powde... tips:ehow.com/how_3035_detect-prevent-powdery... good pictures another extension services:extension.umn.edu/yardandgarden/ygbriefs... this wasn't more than you wanted to know...it is very common, I wish you good luck! Librarian50 Sources: ohioline.osu.edu/hyg-fact/3000/3047.html .

Powdery mildew is mostly an environmental problem... Caused by poor air circulation, high humidity, warm temperatures and shade. Whatever you can do to alleviate these conditions will help. Never water at dusk or at night--no, you can't stop the rain.

Thin your plantings, especially those in the shade. Trim all affected hard wood branches; use a bleach, water and soap solution to disinfect your pruners with each cut. Wear gloves that you can wash.

Clean up and destroy all affected leaves. Don't put them in your compost pile. You can spray with a sulfer-based fungicide.

I've used a concoction of baking soda, water and a squirt of Ivory dish detergent which is a little more eco-friendly. Sulfer can damage some plants, especially food crops. Sources: me .

String beans with powdery mildew. Safe to eat? " "My Zepherine Drouhin climbing rose always gets powdery mildew.

What causes this and what can I do about it?

String beans with powdery mildew. Safe to eat?

My Zepherine Drouhin climbing rose always gets powdery mildew. What causes this and what can I do about it?

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