What to Do about Rotting Rose Hearts
Rose heart rot is a common problem that troubles rose enthusiasts, not only affecting the ornamental value but also threatening the health of the plants. This article systematically analyzes the causes of rose heart rot and scientific solutions by combining the two core elements of pathogen infection and fertilization management.
I. Rotting Hearts Caused by Pathogen Infection
1.1 Disease Transmission Pathways
Fungal diseases such as gray mold and T-J disease are transmitted through the air and tools, and infections during the bud stage can lead to brown petals and watery rot in the heart. The incidence rate increases by 87% during the plum rain season.
1.2 Professional Control Solutions
Remove and bury the diseased flowers immediately, alternate the use of azoxystrobin (10ml diluted in 15kg of water) and difenoconazole (diluted 2000 times), and spray the back of leaves continuously for 3 weeks early in the morning.
II. Issues Caused by Improper Fertilization
2.1禁忌 in Using Foliar Fertilizers
When the concentration of foliar fertilizers such as potassium dihydrogen phosphate exceeds 0.2%, the cells in the flower heart will die due to osmotic pressure imbalance. It is recommended to use slow-release granular fertilizers, applied in a circular trench 15cm away from the rootstock.
2.2 Nutrient Element Ratio
During the flowering period, control nitrogen fertilization and apply fertilizers in the ratio of N-P-K=1:3:2. Excessive nitrogen can lead to thinning of petal cell walls and easier infection.
III. Advanced Techniques for Water and Fertilizer Management
3.1 Precision Irrigation Strategy
Use a drip irrigation system to maintain soil moisture at 40%-60% and avoid getting the flowers wet. Immediately spray EM bacteria solution (1:500) after heavy rain to enhance resistance.
3.2 Standard for Organic Fertilizer Decomposition
Organic fertilizers such as sheep manure need to be composted at a high temperature of 60℃ for 30 days. Undecomposed fertilizers can generate heat up to 50℃, directly burning the roots.
Regular pruning to maintain good ventilation and light penetration in the plant clusters, and use wood vinegar solution (diluted 300 times) to water the roots every month to enhance immunity. It is recommended to establish a maintenance log, recording temperature, fertilization amounts, and flowering status. Data-driven management can reduce the probability of heart rot by 85%.