More Perennials and Perennial Diseases!


Diseases of Yarrow-Botrytis on yarrow flowers are often seriously inflicted with the disease Botrytis. Botrytis known as gray mold appears as brown dead areas and under proper moisture may have a gray fuzzy appearance. It attacks buds, flowers, leaves, and stems. It may eventually kill the perennial. Fungicides and sanitation are helpful.

Powdery mildew is another fungal disease that is often described as a white powder on the leaves. Several cool humid nights and warm dry days in a row help promote the outbreak of this disease. Powdery mildew tends to be worse on plants growing in shade. There are many fungi that can cause powdery mildew. Fungicides and improving sunlight and air circulation can help reduce infection. Purchase PureSpray Green today and take control of Powdery Mildew!

Spittlebug is an insect that will attach Yarrow. The insect produces protective foam that looks like “spit”. The foam helps protect the insect from ultra violet light and predators and insecticides. Use a strong spray of water to wash the foam off ofthe insect. The resulting exposure to UV light will kill the insect and expose it to predators. A stronger spray of water may also remove the insect from the plant in addition to the “spit”. AllGuard is an organic spray that naturally repels insects. Purchase it today and eliminate those pesky Spittlebugs!




Powdery mildew will also occur under the right weather conditions. Botrytis may also occur. May get brown dead areas as well as distorted leaves. These plants now get aster yellows. The disease causes a witches broom in the flower head, greening of petals sometimes, stunting and possible death of the plant. Infected plants should be destroyed. Purchase PureSpray Green today and take control of Powdery Mildew!

There is an eriophyid mite that causes the flower to develop lumps or bumps or leaf like structures growing out the side. Remove infested flowers and destroy them. Also, apply AllGuard Organic Garden Spray. It is very effective when trying to control mites. BUY NOW



Daylily leaf streak causes reddish spots with yellowish margins that often result in brown streaks down the center of the leaves. Usually this leaf disease does not cause the death of the plant. Fungicides and sanitation are helpful. Daylilies are very cold hardy.

When these plants are emerging from the soil and are growing vigorously they are susceptible to frost injury. The frost injury often becomes infected with saprophytic fungi.


Coral Bells:

Coral bells get both fungal and bacterial leaf diseases.

Pseudomonas causes “reddish” brown spots that may cause the leaf to be deformed

Xanthomonas causes small brown angular to circular spots with yellow halos.

Anthracnose causes small brown spots

Botrytis causes large brown spots. In addition the plant is prone to sun burning when the plant is exposed to too much hot sun. The sun burning causes irregular bleached dead areas on the leaves.




Hostas are normally attacked by two insects and slugs.

Grasshoppers eat large irregular holes and black vine weevils eat notches in the edges of the leaves. Slugs eat small irregular holes. Use insecticides on the insects. Controlling the growing conditions is more useful for slugs (keep plants on dry side minimizes use of mulches). AllGuard Organic spray is the answer to eliminating grasshoppers. BUY NOW

Anthracnose, sun burning, and drought stress are the other problems. Anthracnose causes brown lesions that may spread to encompass entire leaf. Sun burning often bleaches (light tan to whitish) the leaves. Drought stress usually causes dead leaf margins that may become infected with saprophytic fungi. Anthracnose usually causes brown spots on the leaves that can merge to form irregular dead areas and occurs more often on hostas in wet or over watered locations.



The most common is powdery mildew. Buy resistant varieties. Improve sunlight and air circulation. Fungicides and sanitation are helpful. Purchase PureSpray Green today and take control of Powdery Mildew!



Roses get many diseases and “insects.” Aphids, rose midge, spittlebug and mites are some of the more common insect problems. AllGuard Organic spray is the answer to eliminating all your insect problems! BUY NOW

Black spot is the most common fungal leaf disease on roses. Black spot symptoms include black to brownish spots with wide yellow halos. Fungicides and sanitation are helpful.

Other fungal problems are cankers (dead areas on the stem that can enlarge and eventually kill stem or even the entire plant. Avoid stressing plants, prune, water, and fertilize to improve vigor. Prune cankered canes immediately above the second last healthy node below the diseased areas. Fungicides are not very effective.

Rust on roses cause yellow spots that may develop orange pustules.

Powdery mildew creates a whitish appearance on leaves and will need several days of cool humid nights and warm days. Purchase PureSpray Green today and take control of Powdery Mildew!

Mycohaerealla leaf spot causes tan to gray spots with purple to red halos.

Botrytis often attacks open blooms on roses. Fungicides and sanitation are helpful. Misapplied pesticides can cause injury that can sometimes be confused with virus diseases.

Virus diseases include ring spot and mosaic viruses. Eradicate infected plants since there are no chemical controls.

Crown gall is an important bacterial disease that causes growths to occur on roots and stems which may result in the plant’s death. Remove infected plants. Many plants can get crown gall so it is best to leave ground unplanted for years or to grow plants that are highly resistant to this disease.

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