Why are peony leaves prone to scorching?
In summer, when temperatures are relatively high and peony leaves are exposed to strong light, yellowing and drying of leaf tips and leaf edges sometimes occur. Based on years of observation and analysis, the author discusses the causes and preventive measures.
I. Causes of dry leaf tips and dry leaf edges in peonies
1. Alkaline soil Saline-alkaline soil reduces the absorption of water and nutrients by the peony root system, causing nutritional imbalance. In summer, high temperatures and sunscald further intensify the imbalance between the plant's supply and demand for water and nutrients, making leaves more prone to dry tips and dry edges; in severe cases, the leaves of the entire plant wither and dry out.
2. Overly sandy soil In overly sandy soil, water and fertilizer are easily lost, the soil dries out easily, and peonies grow poorly. In the hot summer, because the surface temperature of sandy soil rises rapidly, transpiration increases, and peony leaves lose a large amount of water, thereby causing the leaf tips and leaf edges to dry up.
3. Barren soil In soil with poor fertility, plants grow thin and weak, leaves are thin in texture and pale in color, and resistance is poor. Under the scorching sun, dry leaf tips and dry leaf edges are also likely to occur.
4. Compacted soil Soil compaction affects the circulation and exchange of water, nutrients, and air. Under strong light and high temperatures, due to excessive evaporation of water, the root system cannot absorb water and nutrients from deep in the soil in time, while the leaf tips and leaf edges, being at the top and margins of the leaves, suffer the most severe sunscald damage.
5. Continuous cropping Continuous cropping reduces soil fertility, and the available nutrients and trace elements become scarce, plant resistance decreases, pests and diseases worsen, and dry leaf tips and leaf edges are also prone to occur.
6. Late planting If plants are planted too late, because temperatures drop, the roots cannot produce fibrous roots before the soil freezes. The following spring, the peony sprouts and grows rapidly, but the roots cannot absorb sufficient water and nutrients. In the sunny, hot, and dry summer, peony branches and leaves are very likely to wilt, causing leaves to shrivel and edges to dry.
Reasons why peony leaves are easily scorched in summer
In summer, when temperatures are relatively high and peony leaves are exposed to strong light, yellowing and drying of leaf tips and leaf edges sometimes occur. Based on years of observation and analysis, the author discusses the causes and preventive measures.I. Causes of dry leaf tips and dry leaf edges in peonies
1. Alkaline soil Saline-alkaline soil reduces the absorption of water and nutrients by the peony root system, causing nutritional imbalance. In summer, high temperatures and sunscald further intensify the imbalance between the plant's supply and demand for water and nutrients, making leaves more prone to dry tips and dry edges; in severe cases, the leaves of the entire plant wither and dry out.
2. Overly sandy soil In overly sandy soil, water and fertilizer are easily lost, the soil dries out easily, and peonies grow poorly. In the hot summer, because the surface temperature of sandy soil rises rapidly, transpiration increases, and peony leaves lose a large amount of water, thereby causing the leaf tips and leaf edges to dry up.
3. Barren soil In soil with poor fertility, plants grow thin and weak, leaves are thin in texture and pale in color, and resistance is poor. Under the scorching sun, dry leaf tips and dry leaf edges are also likely to occur.
4. Compacted soil Soil compaction affects the circulation and exchange of water, nutrients, and air. Under strong light and high temperatures, due to excessive evaporation of water, the root system cannot absorb water and nutrients from deep in the soil in time, while the leaf tips and leaf edges, being at the top and margins of the leaves, suffer the most severe sunscald damage.
5. Continuous cropping Continuous cropping reduces soil fertility, and the available nutrients and trace elements become scarce, plant resistance decreases, pests and diseases worsen, and dry leaf tips and leaf edges are also prone to occur.
6. Late planting If plants are planted too late, because temperatures drop, the roots cannot produce fibrous roots before the soil freezes. The following spring, the peony sprouts and grows rapidly, but the roots cannot absorb sufficient water and nutrients. In the sunny, hot, and dry summer, peony branches and leaves are very likely to wilt, causing leaves to shrivel and edges to dry.
Different peony varieties differ in their ability to withstand high temperatures and sunscald. In the same plot, some peony varieties grow robustly with thick leaves, and although exposed to intense sunlight, their leaves rarely show dry tips, remaining dark green even into late autumn; while some varieties have mostly thinner and lighter-colored leaves, with slightly poorer resistance to summer sunscald, and their leaves show more dry tips and dry edges, leading to widespread leaf spot disease and causing the leaves to rot prematurely.
II. Preventive measures
1. Saline-alkaline land and windblown sandy land are not suitable for planting peonies. If planting is done, saline-alkaline land should have the soil replaced before planting, windblown sandy land should have an appropriate amount of clay added, continuous cropping land should practice crop rotation, and relatively hard compacted soil should be deep-plowed to improve soil permeability.
2. Increase the application of organic fertilizer or compound fertilizer to build up soil fertility and promote robust plant growth.
3. Plant at the appropriate time, water promptly during drought, and also water promptly on soil with poor water retention. Before the hot summer, shade frames can also be set up.
4. From May onward, spray 50% carbendazim at 600 times dilution or 70% thiophanate-methyl at 800 times dilution, and add 0.3% potassium dihydrogen phosphate. For barren soil, 0.2% urea can also be added. Apply once every 15 to 20 days, continuing to spray until the end of July.
The above measures can effectively enhance peony vigor, reduce damage caused by sunscald, reduce the occurrence of dry leaf tips and dry leaf edges, and lay the foundation for good flowering next year.
Causes of and control measures for peony leaf scorch in summer
In summer, when temperatures are relatively high and peony leaves are exposed to strong light, yellowing and drying of leaf tips and leaf edges sometimes occur.
I. Causes of dry leaf tips and dry leaf edges in peonies
1. Alkaline soil Saline-alkaline soil reduces the absorption of water and nutrients by the peony root system, causing nutritional imbalance. In summer, high temperatures and sunscald further intensify the imbalance between the plant's supply and demand for water and nutrients, making leaves more prone to dry tips and dry edges; in severe cases, the leaves of the entire plant wither and dry out.
2. Overly sandy soil In overly sandy soil, water and fertilizer are easily lost, the soil dries out easily, and peonies grow poorly. In the hot summer, because the surface temperature of sandy soil rises rapidly, transpiration increases, and peony leaves lose a large amount of water, thereby causing the leaf tips and leaf edges to dry up.
3. Barren soil In soil with poor fertility, plants grow thin and weak, leaves are thin in texture and pale in color, and resistance is poor. Under the scorching sun, dry leaf tips and dry leaf edges are also likely to occur.
4. Compacted soil Soil compaction affects the circulation and exchange of water, nutrients, and air. Under strong light and high temperatures, due to excessive evaporation of water, the root system cannot absorb water and nutrients from deep in the soil in time, while the leaf tips and leaf edges, being at the top and margins of the leaves, suffer the most severe sunscald damage.
5. Continuous cropping Continuous cropping reduces soil fertility, and the available nutrients and trace elements become scarce, plant resistance decreases, pests and diseases worsen, and dry leaf tips and leaf edges are also prone to occur.
6. Late planting If plants are planted too late, because temperatures drop, the roots cannot produce fibrous roots before the soil freezes. The following spring, the peony sprouts and grows rapidly, but the roots cannot absorb sufficient water and nutrients. In the sunny, hot, and dry summer, peony branches and leaves are very likely to wilt, causing leaves to shrivel and edges to dry.