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Cool, humid weather gives rise to infection with powdery mildew fungus Sphaerotheca pannosa.

Jul 13, Spraying the leaves with a rose and flower insecticide works, and the bugs fall off the leaves immediately. Whiteflies, aphids, and over insects and bugs are affected by the chemicals in the.

Oct 29, A common homemade spray for rose bushes uses a small amount of vinegar. Too much vinegar can damage the plant's tender leaves and buds. Mix a scant tablespoon of vinegar with a cup of water. Pour in 1 1/2 tablespoons of baking soda and add a tablespoon of mild liquid dish soap. Finally, add a tablespoon of neutral cooking oil to complete the base.

Apply fish emulsion to your roses around mid-month, one tablespoon mixed with one gallon of water. If you have more than 50 rose bushes, a siphon device (such as Syphonex or Hyponex) or a submersible pump is recommended for application. Later in the month, 1/2 cup of alfalfa pellets can be spread around each rosebush, a quarter cup for minis.

Spray Schedules. Winter maintenance includes spraying the ground around rose bushes with an insect-and-disease formula or horticultural oil.

Aliette is an effective fungicide in preventing further spread of the disease.

The insect-and-disease formula is. Fall Care: October and November. Depending on where you live and how soon fall and winter come, you'll want to start protecting your roses for the winter during the fall months. Once you have had a few good frosts, leaves will start falling. Apply a dormant spray such as lime sulfur and/or spray oil. SevinInsect Killer in ready-to-use, concentrate and ready-to-spray liquids kills and controls common rose pests and hundreds of other garden pests, including ants and other nuisance pests attracted by honeydew.

Tough on aphids and beetles, but gentle on gardens, these highly effective insecticides keep on working to protect your roses for up to three months. Organic gardeners have long used soap and water as a natural insecticide for roses and other plants. To make a soap spray, mix pure soap such as soap flakes or unscented dish soap with water until the soap dissolves, then spread suds on plants by spraying or with your hands.

It is important to use pure soap without additives like whiteners or fragrance.

There are many approaches to controlling rose pests effectively.

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