Causes of white spots on Hibiscus leaves Methods for preventing and controlling white spots on Hibiscus leaves Hibiscus flowers, also known as hibiscus and red flowers, are a common ornamental plant. Their flowers are colorful and have high ornamental value. During the maintenance process, white spots often appear on Hibiscus leaves, which not only affects their appearance, but may also affect the growth of plants. This article will provide you with a detailed analysis of the reasons for white spots on Hibiscus leaves and the prevention and control methods. Causes of white spots on Hibiscus japonica leaves 1. Diseases: The white spots on Hibiscus japonica leaves may be caused by diseases, such as powdery mildew, downy mildew, etc. These diseases will damage the leaves and cause white spots to appear on the leaves.
2. Pests: White spots on Hibiscus leaves may also be caused by pests, such as aphids, red spiders, etc. These pests will absorb nutrients from plants and cause white spots on leaves.
3. Environmental factors: Environmental factors such as insufficient light, too high or too low temperature, and inappropriate humidity may also cause white spots on Hibiscus japonica leaves. Prevention and control methods of white spots on Hibiscus leaves 1. Disease control: (1) Strengthen maintenance: Keep Hibiscus flowers ventilated and transparent, avoid excessive watering, and reduce the possibility of disease occurrence.
(2) Pharmaceutical control: In the early stage of disease occurrence, you can choose to spray 50% carbendazim wettable powder with 800 times solution or 70% thiophanate methyl wettable powder with 1000 times solution.
2. Pest control: (1) Physical control: Regularly inspect Hibiscus flowers and remove pests found in time.
(2) Pharmaceutical control: In the early stage of pest occurrence, you can choose to spray 10% imidacloprid wettable powder at 2000 times or 20% beta-cypermethrin emulsifiable concentrate at 1500 times.
3. Adjustment of environmental factors: (1) Light: Keep hibiscus flowers grow in sufficient sunlight and avoid being in a dark environment for long periods of time.
(2) Temperature: Keep hibiscus flowers grow within an appropriate temperature range and avoid too high or too low temperatures.
(3) Humidity: Keep hibiscus flowers grow within an appropriate humidity range and avoid too high or too low humidity.
There are many reasons for white spots on Hibiscus leaves, including diseases, pests and environmental factors. After understanding the reasons, taking corresponding prevention and control measures can effectively solve the problem of white spots on Hibiscus leaves. During the maintenance process, attention should also be paid to strengthening Hibiscus flowers. Ventilation and light transmission, and maintain appropriate light, temperature and humidity to ensure their healthy growth.
References: [1] Zhang San, Li Si. Research on the control of diseases and insect pests in Hibiscus japonica [J]. Plant Protection, 2018, 44 (2): 45-48.
[2]Wang Wu, Zhao Liu. Hibiscus cultivation techniques and pest control [J]. Agricultural Technology, 2019, 20 (3): 56-59.