Common scab
Streptomyces spp.
What is a Common scab (Streptomyces spp.)?
Common scab is a bacterial disease caused by Streptomyces spp., It affects underground crops, primarily potatoes, in potato-growing regions worldwide. Infected plants develop circular lesions on tubers, ranging from small spots to larger patches. Lesions are raised at the edges and slightly depressed in the center. Different forms include russet scab (tan to brown corky lesions), pitted scab (depressions beneath the tuber surface), and raised scab (warty lesions). The disease can be mistaken for powdery scab and patchy russeting. Streptomyces spp. can also cause brown stem and stolon lesions.
How does Common scab (Streptomyces spp.) occur?
Common scab is spread by Streptomyces spp. bacteria, which survive in soil and infected seed tubers. Spores persist in soil and organic matter, germinating under favorable conditions to infect developing potato tubers. The bacteria colonize tuber surfaces and produce scab-inducing metabolites like thaxtomin. Infected tubers serve as a source of inoculum, spreading the disease to new plants. Proper composting can eliminate infective Streptomyces spp., while warm dry soils favor infection.
Symptoms
1 - Impacts on Plants
Common scab causes scaly lesions on tubers, reducing their market value. Severe infections lead to rejected tubers, affecting farmers' profitability and causing economic losses.
2 - Soil Health and Environment
• Streptomyces spp. can persist in soil, particularly in the presence of decaying organic matter, acting as a potential source of infection for future crops. • Intense scab infections can accumulate scabby tubers in the soil, potentially reducing its quality and nutrient availability.
Solutions
1 - Cultural and Agronomic Practices
• Rotate crop with non-host crops to break the disease cycle and reduce inoculum buildup in the soil. • Use certified seed tubers free from common scab to minimize introducing the pathogen into the field. • Maintain optimal soil moisture levels during tuber initiation and growth stages to reduce scab severity. • Avoid excessive nitrogen fertilization, as it can promote scab development. • Properly dispose of infected tubers to prevent disease spread.
2 - Soil Management
• Maintain soil pH above 5.5, as lower pH inhibits scab development. Note that S. acidiscabes can cause scab in acidic soils. • Avoid excessive accumulation of decaying organic matter in the soil, as it can harbor Streptomyces spp.
3 - Biological and Chemical Control
• It is recommended to consult with local agricultural experts or extension services to identify and select the most suitable biocontrol agents for common scab management in your region. • Consult local experts for recommended Chemical products and guidelines. • Integrated Pest Management: Implement an integrated approach combining cultural, biological, and chemical control methods based on local recommendations.
Susceptible Species
FAQ
Do shade growing plants need any Sunlight?
Shade growing plants do need sunlight, although they require less than other plants. They need some direct sunlight each morning to help them photosynthesize and grow properly. Also, indirect sunlight throughout the day helps them stay healthy. Shade growing plants will benefit from the sunshine, but if they get too much or too little, then they can suffer the consequences. It's important to pay attention to the needs of your plants so that you can provide them with the proper light for optimal growth.
How often should you water indoor plants?
Indoor plants should be watered when the soil feels dry to a depth of about two inches, usually about once a week. A helpful technique to determine your plants' watering needs is to feel the soil before and after watering to get a sense of how long it takes to dry out. An important note to remember is that some plants require less water than others, and it's best to research the specific needs of your individual plants. Likewise, if your home is very dry, you might need to water more often as the lack of moisture can stress the plants and lead to problems like brown leaves and wilted stems.
Can my monstera plant get root rot?
Yes, a plant can get root rot. Root rot is a fungal disease that can be caused by over-watering, poor soil drainage, or high humidity levels in the air. Signs of root rot include yellowing leaves, wilting and stunted growth, and damaged or browning root systems. Sometimes it is difficult to detect root rot until the plant is removed from the soil, as the problems are mainly below the soil surface. Treating root rot usually involves removing the affected parts of the plant and replanting the unaffected ones.
Can I put my Monstera outside in summer?
No, you should not put your Monstera outside in summer. Monstera plants need warm, humid air to thrive, and direct sunlight can scorch their leaves. Instead, put your Monstera in a bright, sunny spot with indirect light, making sure the sun never directly hits the leaves. During the summer, keep your Monstera's soil damp and mist it occasionally to keep the leaves hydrated. At nighttime, keep the temperature around 16 - 21°C (60 - 70°F). You can definitely take your Monstera outdoors for short periods of time, just make sure to bring it back in if it starts to get too hot.
What happens if my monstera plant gets too cold?
If your monstera plant gets too cold, it will become vulnerable to pests, disease, or other damage. Cold temperatures can damage the leaves of the plant, causing them to become spotted or limp. The roots of monstera plants may also suffer in cold temperatures, leading to root rot or other diseases. Belonging to the tropical family, monsteras are used to warm environments and do not do well in cold temperatures, so it is important to ensure your plant is kept in conditions that suit their needs.
Is it possible to grow a vegetable garden in a small space?
Yes, it is possible to grow a vegetable garden in a small space. Gardening in a small space can be as simple as growing a few containerized plants in pots and raised beds, or as elaborate as vertically stacking planters, hanging pouches, and hanging baskets on a wall, railing, or fence. Regardless of the size of the space you are working with, some simple techniques such as companion planting, organic fertilizers, and water conservation can help you get the most out of your small vegetable garden.
Is peppermint herb green good for digestion?
Peppermint herb is indeed beneficial for digestion. The flavonoids in the herb support digestion by reducing inflammation in the digestive track, aiding in digestion and relieving indigestion, heartburn, and even the symptoms of irritable bowel syndrome. Additionally, peppermint is naturally rich in menthol, which helps to relax the muscles of the stomach, aiding in the digestion of food. Peppermint herb can be consumed in a variety of forms, such as teas, tinctures and capsules, as well as by adding the herb to food or directly to water or tea.
Should peppermint herb green be consumed daily?
No, peppermint herb green should not be consumed daily. This is because it contains high levels of menthol, which can be toxic if taken in large doses. Additionally, consuming large amounts of peppermint herb green could interfere with the absorption of essential minerals and vitamins, potentially causing vitamin deficiencies. For these reasons, it is best to consult with a doctor before incorporating peppermint herb green into your daily diet.
