Even though summer carries warmth and better times, it can also bring humidity and sun showers which can be a nasty bearer of diseases and fungal infections.
Several Rose diseases Physan 20 is effective against:
Anthracnose, Black Spot, Botrytis, Brown Canker, Downy Mildew, Leaf Blights, Leaf spots, Powdery Mildew, Rust, Stem Gall
BROWN CANKER:
Rose/Brown canker aka Coniothyrium spp is a common fungal infection that affects the canes of rose plants where if left untreated, can decimate your rose bush eventually killing it. Rose cankers often appear as black/brown blotches on the canes of rose bushes. It is a very infectious disease and can spread easily through contact with cutting shears or secateurs that haven’t been sanitized when pruning multiple bushes. That is why it is common to first see signs of Rose Canker shortly after a recent pruning. Canker is most active during the cold winter months, so it is important to have a good spraying program with a broad range fungicide as preventative maintenance
TREATMENT:
Diseased canes should be pruned back to sound, healthy wood in the spring prior to budbreak. Make sure to use sharp, clean equipment to maximize healing. Equipment can be disinfected with a solution of Physan 20.
Use Regular spraying of Physan 20. Application should begin in early Spring as soon as new growth starts and should be made often enough to provide protection throughout the rainy periods and to keep the new growth covered. On the average, an application once a week will be needed from early Spring until plants are dormant.
For Spraying Solution - Use 2 teaspoons of PHYSAN 20 in 3.7 Litres of water
For Tool Disinfection Solution - Use 1 teaspoon of PHYSAN 20 in 900ml of water
Black Spot is one of the most common and persistent Rose diseases. Symptoms appear on the leaves as circular, black spots that are often surrounded by yellow halos. Leaves can start yellowing and at times can turn completely and drop prematurely. Symptoms may also develop on canes and appear as purple-red blotches that blacken with age and develop a gnarled blistering appearance. Black spot is usually most severe in the wet winter weather.
Treatment:
Black spot can be controlled by following a good sanitation program such as removing infected leaves as soon as they appear and not letting leaf residue/debri linger in the Autumn. Diseased canes must be pruned back to healthy wood in spring prior to budbreak. Having sufficient space between plants ensures good air circulation and can help reduce spread of diseases. Avoiding watering early in the day and top down watering can minimize favourable conditions for disease development. Use Regular spraying. Physan 20 application should begin in early Spring as soon as new growth starts and should be made often enough to provide protection throughout the rainy periods and to keep the new growth covered. On the average, an application once a week will be needed from early Spring until plants are dormant.
Use 2 teaspoons of PHYSAN 20 in 3.7 Litres of water
Powdery Mildew is another common disease of rose recognized worldwide, particularly a nuisance for glasshouse growers. Powdery Mildew is recognized by white, powdery fungal growth on buds, leaves and shoots. Early symptoms appear as reddish patches on leaves that eventuate to the white, powdery appearance and flower buds infected with powdery mildew often fail to open. Unlike other fungi that require moisture to infect, Powdery mildew does not require wet conditions and can appear in relatively dry conditions especially if the air is humid and warm around midsummer or spring.
Treatment:
Powdery Mildew can be controlled by following a good sanitation program such as removing infected leaves as soon as they appear and placed in a bag and discarded accordingly to avoid the spread of fungal spores to surrounding plants. Diseased canes should also be pruned back to healthy wood in the spring, prior to budbreak and ensure there is enough circulation around the plants for healthy airflow minimising favourable conditions for fungal infections.
Spray with Physan 20 solution when symptoms first appear. Make sure to spray the upper and lower surface of leaves and branches until thoroughly wet. You should be spraying with Physan 20 7 to 10 days apart.
Use 2 teaspoons of PHYSAN 20 in 3.7 Litres of water
Rose Rust is a fungal disease that can develop on leaves and any other green parts of the plant, however at its worst symptoms can appear on the entire plant. Small, orange boils develop in early spring on leaf surfaces that gradually enlarge to become more pronounced on the lower surface of the leaf. Mottled areas can also develop on the upper surface of the leaf and develop to boils on the lower surface. Serious infections can result in premature defoliation but this varies depending on the Rose strain and its susceptibility to infection. Rust adores cool temperatures, high moisture, and high humidity and can lie dormant on dead leaves, plant debris, and infected canes.
Treatment:
Rose Rust can be controlled by following a good sanitation program such as removing infected leaves as soon as they appear and placed in a bag and discarded accordingly to avoid the spread of fungal spores to surrounding plants. Diseased canes should also be pruned back to healthy wood in the spring, prior to budbreak and ensure there is enough circulation around the plants for healthy airflow minimising favourable conditions for fungal infections. Spray with Physan 20 solution when symptoms first appear. Make sure to spray the upper and lower surface of leaves and branches until thoroughly wet. You should be spraying with Physan 20 7 to 10 days apart.
Use 2 teaspoons of PHYSAN 20 in 3.7 Litres of water
Stem Gall / Crown gall is a fungal stem disease characterised by galls or swellings on the main stem seen on or slightly below the soil line. Galls are noticeably irregular in shape - they come in all shapes and sizes and can even infect roots and aerial canes of the plant. Young galls can be light green or a soft off-white and darken with age to brown or black becoming hard and woody. The tricky thing with Gall is that infected roses react in different ways; Some appear stunted, others have poor foliage and produce few flowers or flowers of poor quality, and others to put it simply just die. The area where the gall is situated has a significant impact on the symptoms, for example, a single gall at the base of a stem may be more damaging than several galls located on roots or aerial canes. The Gall bacterium infects through open wounds from pruning, cultivating, insect chewing, or heaving in frozen soil. Like many other fungal diseases Gall is also transmitted from using unsanitised cutting tools. Crown gall bacteria can survive without a plant host in the soil or surrounding debris for at least two years making it a troublesome fungal foe indeed.
Treatment:
Stem Gall can be managed by following a good prevention and sanitation program. When transplanting inspect plants prior to planting and make sure they are healthy and disease-free. Avoiding injuries to the roots and crown during planting and cultivating is also helpful. Canes with galls can be pruned back to healthy wood and make sure to use sharp and clean (disinfected) pruning equipment. Spray with Physan 20 solution when symptoms first appear. Make sure to spray the upper and lower surface of leaves and branches until thoroughly wet. You should be spraying with Physan 20 7 to 10 days apart.
Use 2 teaspoons of PHYSAN 20 in 3.7 Litres of water
Tool Disinfectant Solution : Mix 1 teaspoon of Physan 20 for every 0.9 Litres of water for a killer tool sterilizer.