how do i get rid of botrytis blight in roses?

Answer 1

Who told you your Rose has botrytis blight? I'll bet you a new Rose bush (installed) that you do NOT have botrytis blight. It just doesn't do Roses. I bet all you have is some powdery mildue? Botrytis rot, or gray mold attacts friuts and veggies & is not know to go after woodie plants, like the Rose. Commonly affected crops include strawberries, lettuce, squash, melons, beans, peas and an occational artichoke, but never a Rose. Damp areas near the ground turn leaves, flowers and green fruit turn brown & develop a gray or brown fuzzy growth of fungal spores. Botryis cinerea, survives in decaying plant material in the ground and usually infests only the plant parts nearist the ground.
Just to make you happy, lets say your Rose has it. Avoid nitrogen fertilizer. Good ventilation is a must & nitrogen will encourage growth stopping air flow. Remove infested fruit, like bunches of grapes. (you didn't say if your Rose had any grapes growing on it, did you?) Clear away infected foliage, plant your next crop of Roses in a raised bed and use furrow irrigation. Stake any low hanging Rose buds to avoid soil contact. Prop heavy ripening fruit or Rose buds with an old strawberry basket. Keep the ground and area around the infected plant clear of all debris. Infected plant materials should be disposed of well, so not to allow spores to spread. Keep the plants as dry as possible & treat as you would for powdery mildew because that is what you really have.

Answer 2

Botrytis Blight

Answer 3

You can indeed have botrytis on your roses. Botrytis is typically found in areas that are high in humidity, so if it was humid in your area, you may have had the disease. In order to reduce incidence of disease, you should reduce the humidity around your plants by pruning your roses to allow more air flow through the plants, modify the watering schedule around the plants to decrease humidity, and don't put down too much mulch or other ground cover under your roses as mulch can also increase humidity. You would also want to remove infected debris and cut off any infected plant parts.

In order for disease to occur, a pathogen, susceptible host, and conducive environment must be present. If you remove any of those components, you will no longer have conducive conditions for disease development. This holds for ANY disease!!

Answer 4

There are a couple of ways you can eradicate botrytis through the use of chemicals on roses but you can prevent its occurence by pruning and opening up the centers of your plants so more air can flow freely through. Also, try to plant your roses away from fences or other things that might prevent air movement.

Since botrytis can survive on dead leaves, flowers and branches, it's best to remove them. You'll find that botrytis doesn't like hot or dry conditions and prefers wet and cool weather. Prevent overhead watering so you won't spread the disease and create favorable conditions for it to become established. If you do need to water, try watering early in the day so the leaves have more time to dry versus doing this later in the day.

It's impossible to prevent the spread of the fungal spores since they can move around by wind or rain splashing on the leaves.

Chemicals that are quite effective on Boytritis are; "Daconil", (active ingredient is called CHLOROTHALONIL") and it is found quite often in some of the fungicides at your local nursery. The downside to this product is that it has been found to destroy some of the beneficial bacteria and fungi that are found in our soils. I'm not sure about the safety of this product so you'll have to do some research on it.

Copper is also very effective in controlling Botrytis and it's been around for many years and it's a safe product. You can find copper in lots of fungicides sold at the hardware stores.

Answer 5

RE:
how do i get rid of botrytis blight in roses?

Answer 6

Interesting topic!

Answer 7

Interesting question