The stalk-based rot disease is a major issue affecting hydroponic amaranth, particularly in leek cultivation. To manage this disease effectively, integrated pest management strategies involving the use of appropriate pesticides can be employed for dual control. The China Pesticide Network offers guidance to help farmers identify and manage the disease, reducing crop losses.
**Symptoms:**
This disease primarily affects the base of the stem. Infected plants show signs of dehydration and wilting. Upon inspection, the base of the stem appears brown and necrotic, with the root cortex deteriorating and falling off. New roots fail to develop, leading to further decline in plant health.
**Pathogen and Disease Characteristics:**
The exact pathogen responsible for this condition is still under investigation. However, similar diseases like ground stalk rot are known to be caused by *Myrothecium roridum*. This fungus survives in the soil as mycelium and spores through winter, spreading via conidia. Wind and rain play a role in transmitting the infection from the base of the stem. While there are similarities, it remains unclear whether the pathogen and disease characteristics of hydroponic amaranth stalk rot are identical to those of traditional leek stalk rot. Further research is needed in this area.
**Control Methods:**
To prevent and manage this disease, the following steps are recommended:
1. **Crop Rotation:** Avoid planting leeks or related crops in the same area consecutively.
2. **Field Sanitation:** After harvest, remove all diseased and dead plants, and thoroughly plow the soil to reduce pathogen buildup.
3. **Soil Disinfection:** Before sowing, treat the soil with disinfectants or sprays to eliminate potential pathogens.
4. **Early Detection and Removal:** Regularly inspect the field. If infected plants are found, remove them immediately and apply protective sprays around the affected area—covering 1-2 rows of nearby plants. Recommended fungicides include:
- 40% triadimefon + carbendazim WP diluted 1000 times.
- 69% Anke MnZn + 75% chlorothalonil (1:1) at 1000–1500 times dilution.
- 25% Shibao suspension diluted 1000 times.
- 50% Shi Baog emulsifiable oil diluted 2000 times.
Apply these solutions 2–3 times, every 7–10 days. However, due to the limited experience in managing this disease in hydroponic systems, alternative methods may be necessary.
**Special Recommendations for Hydroponic Systems:**
Since traditional soil-based methods may not directly apply, the China Pesticide Network suggests using nutrient solution disinfection techniques. Another approach involves temporarily lowering the water level in the hydroponic system, allowing the root zone to dry out for several hours or half a day. Afterward, spray the base of the stems with a protective solution and then restore the water level. This method helps reduce the risk of infection while maintaining optimal growth conditions.
By combining proper cultural practices with targeted chemical treatments, growers can better manage this challenging disease and improve the sustainability of their hydroponic amaranth production.
Water Fountain,Music Water Fountain,Indoor Decorative Fountains,Water Music Fountain
Guangzhou Dewy water fountain Technology Co., LTD , https://www.dewyfountain.com