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- R 149.00
- Lowest seen
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- 13 Sep 2026
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Known for their beautiful flowers and lovely scent, roses are a popular choice for gardeners around the world. With a little time and effort, you can also boast about your beautiful rose garden.
The best defense your rose bush has against heat and disease is its leaves. The leaves regulate the heat and keep the plant’s system cool. When the leaves become damaged and disease-ridden your rose bush will not perform well. Roses are susceptible to attack from insects like aphids and red spider mites. Fungal infections like black spots, powdery mildew, and rust directly affect the leaves.
Red spider mites are microscopic insects that thrive in hot, dry weather, particularly in late summer which leads to the growth of the population. Close plantings with poor airflow can create a favourable environment for the mites. They cause stippling or bronzing of the leaves, which causes the yellowing and loss of leaves fewer flowers, and a fine webbing on the bottom of leaves and stems, indicating heavy infestations. These tiny spiders feed on the plant's sap causing damage and increasing susceptibility to other infections and infested plants exhibit stunted growth and diminished vigor. Plants should be examined weekly as early detection and treatment is essential. Cut and dispose of heavily infected leaves and branches and treat them with a Rose Guard.
Aphids are small, sap-sucking insects that secrete a powdery wax to protect themselves. They thrive in humid conditions and cause damage by sucking sap from their hosts. The leaves become yellow and eventually fall out of the plant due to the damage they cause. In severe infestations, their honeydew, a waxy secretion produced by the aphids, can cause sooty mould which can be controlled with Protek Tenazole.
Rust is a fungal disease that affects roses. They cause powdery orange or rusty-brown spots on the leaves, stems, and sometimes even on the blooms and thrive in humid or wet conditions. Infected leaves can turn yellow, dry out, and fall off. Infected stems can lead to weaker plants and reduced flower production.
Black spot is another fungal disease that thrives in warm, humid conditions and during the rainy season. It leads to leaf loss, weakening the plant and affecting flowers. It causes dark brown or black spots on the upper part of the leaves with a yellow border around the leaves.
Powdery mildew is also a fungal disease that affects roses. They are characterized by a white, powdery coating on the leaves, stems, flowers, and flower buds and thrive in hot, humid environments. It can have an impact on the overall wellness of the plant and infected leaves may curl and twist and buds do not open or become deformed. It can lead to decreased flower production.
It is important to plant roses in well-draining soil allowing adequate air flow around the plants to prevent these diseases. Do not crowd roses as it creates a suitable environment for these diseases to spread. Roses should be watered at the base of the plant and not by overhead sprinkling systems as wet leaves will contribute to fungal disease. Infected leaves, buds, and stems should be removed, where possible.
Protek’s Rose Guard is a multi-purpose, all-round pesticide available as a liquid concentrate for the control of pests and diseases found on roses and other ornamental plants. It offers effective protection against common pests like aphids and red spider mites as well as fungal diseases like black spots, powdery mildew, and rust. It contains a contact insecticide and contact and systemic fungicide for fast and effective protection. Rose Guard provides residual protection to plants and helps maintain healthy foliage and blooms caused by pests and diseases.