What to Do When Ranunculus Gets Pests? Common 2 Pests and 2 Diseases and Their Control Methods
During the growth of ranunculus, the last thing we want to encounter is pests and diseases. Such problems are extremely harmful to the plant and can even cause it to wither and die in severe cases. So what should you do when ranunculus gets pests? And how should pest and disease control for ranunculus be carried out? Below, the editor will walk you through it.
I. What to Do When Ranunculus Gets Pests: Find the Cause
To know what to do when ranunculus gets pests, we first need to identify what kind of pest it is, so we can deal with it accordingly, because the control methods for each pest and disease are different. The details are described below, and those troubled by this can take a look.
II. Pest and Disease Control for Ranunculus (Pests)
1. Leafminer fly
This pest gradually burrows into and feeds on the tissue inside the leaves of ranunculus, forming snake-like white mines. Its excrement is deposited in the mines as a black continuous line. Adults feeding and laying eggs cause round wounds, and in severe cases can cause the plant to wither and die.
Control method: The peak period for this pest is from February to April each year, and we must pay close attention during this time. When dealing with this ranunculus pest, we can directly spray a 5000-fold dilution of 75% cyromazine wettable powder to kill it.
2. Aphids
Aphids are one of the most destructive pests on Earth, harming many plants, and ranunculus is one of them. The damage caused by this pest is mainly adults and nymphs sucking the sap of leaves, stems, tender tips and tender panicles, causing the plant to lose a large amount of nutrients and wilt.
Control method: When dealing with this ranunculus pest, we can spray a 2000-fold dilution of 10% imidacloprid wettable powder to kill it.
III. Pest and Disease Control for Ranunculus (Diseases)
1. Mosaic disease
Mosaic disease is a worldwide viral disease. When it strikes, chlorotic angular lesions appear on the leaves of ranunculus, and over time the color gradually turns brown. It also causes leaf deformation and yellowing, and in severe cases affects the yield and quality of cut flowers.
Control method: For this ranunculus disease, we can use healthy seedlings and avoid dividing and propagating from diseased plants. We can also spray insecticides to control the plant.
2. Blue mold
This disease mainly occurs during the storage period of the tuberous roots, and sometimes during the growing period as well. In severe cases, the surface of stored tuberous roots becomes covered with a large amount of Penicillium conidia, which easily infects healthy tuberous roots, and if not dealt with promptly, can cause the plant to rot.
Control method: When dealing with this ranunculus disease, we can soak the affected tuberous roots in an 800-fold dilution of 75% thiophanate-methyl for 10 to 15 minutes, then dry them and replant, which can reduce the likelihood of the disease occurring.
Identification and Control of Pests and Diseases in Ranunculus
The pathogen of the viral disease is Ranunculus mottle virus or Cucumber mosaic virus. The symptoms of damage are wrinkled and uneven leaves, showing mosaic, chlorotic spots, or leaves shrinking, becoming smaller and thicker. Leaf edges curl toward the upper or lower surface, and petioles shorten, forming a clustered appearance. Affected flowers become twisted and deformed, shrink, and cannot bloom. When the damage is severe, diseased plants are noticeably dwarfed, shrivel and die. The virus often resides in tuberous roots or seeds. In production, when virus-carrying seeds are sown or tuberous roots are planted, the resulting seedlings have a higher incidence of disease. In addition, the virus may also be transmitted to ranunculus during the growing period by aphids, leafminer flies and mining flies, causing viral disease. If the seedbed is sown too densely or potted flowers are spaced too closely during the growing period, plants can also infect each other with the disease.
Control methods: 1. Strengthen plant quarantine to prevent virus-carrying seeds, tuberous roots and plants from being introduced into disease-free areas. 2. Promptly pull out virus-infected plants and burn them in a centralized manner to reduce spread. 3. Strengthen cultivation management, fertilize and water reasonably, ensure ventilation and light penetration, so that plants grow robustly and disease resistance is improved. 4. Spray a 1000-fold dilution of 10% imidacloprid wettable powder or a 1000-fold dilution of 40% omethoate to kill virus-transmitting insects such as aphids, mining flies and leafminer flies. 5. In the early stage of the disease, spray 68% virus wettable powder at 800 or 1000-fold dilution, 3.85% virusbike wettable powder at 100-fold dilution, or 7.5% keduling aqueous solution at 800-fold dilution for control.
Disease Control Methods for Ranunculus
Ranunculus Southern Blight
Symptoms
Southern blight is mainly caused by poor ventilation conditions for the plant, low soil nutrients, and infection by pathogens. When the disease occurs, irregular water-soaked light brown lesions initially appear at the base of the stem, followed by white silky mycelium on the diseased part, which gradually tangles into rapeseed-like sclerotia.
Control methods
Strengthen management, ensure ventilation and light penetration, control watering appropriately, and avoid overly wet soil. Repot and change the soil promptly, and do not let the soil become compacted.
Check promptly and immediately pull out diseased plants when found. At the same time, disinfect the soil promptly; a carbendazim solution can be used to drench the roots to control the development of the disease.
Ranunculus Blue Mold
Symptoms
This disease mainly occurs during the storage period of the bulbs and rarely during the growing period. Infected tuberous roots appear dark brown or black. In severe cases, a large amount of Penicillium conidia grows on the surface of the tuberous roots. If the tuberous roots are damaged at harvest or stored in poorly ventilated places with high air humidity, blue mold is likely to occur and cause serious damage.
Control methods
During harvesting, storage, division and propagation, minimize damage and protect the tuberous roots so they remain intact. Before storage, the tuberous roots must be thoroughly disinfected.
During storage, pay attention to regulating the temperature of the storage site, strengthen ventilation, and reduce humidity. Check frequently, and promptly remove tuberous roots infected with Penicillium to avoid infecting other tuberous roots as much as possible.
Ranunculus Viral Disease
Symptoms
When the plant is diseased, the leaves are wrinkled and uneven, showing mosaic, chlorotic spots, or leaves shrinking, becoming smaller and thicker. Affected flowers grow deformed, become smaller, and may even fail to bloom. When the damage is relatively severe, diseased plants are noticeably dwarfed, shrivel and die.
Control methods
Strengthen cultivation management, fertilize and water reasonably, ensure ventilation and light penetration, so that plants grow robustly and disease resistance is improved.
Promptly remove affected plants when found.
In the early stage of the disease, spray 68% virus wettable powder at 800 or 1000-fold dilution 3 to 5 times.
Ranunculus Root Rot
Symptoms
During the growth period of the plant, if the soil is heavily clayey or too alkaline, or if there is low temperature or waterlogging, root rot can be triggered. Under adverse conditions, the roots are attacked by pathogens, which infect the roots, causing the root system to rot and turn dark brown or black, and the stems and leaves above ground gradually turn yellow and die.
Control methods
During storage, to prevent tuberous roots from rotting, strictly remove diseased tuberous roots, then soak them in a 2% potassium permanganate solution for 15 to 30 minutes and take them out. After the tuberous roots are dried, store them, and pay attention to ventilation and dehumidification at the storage site.
Before planting, the culture soil and tuberous roots must be thoroughly disinfected, and they should be planted somewhat shallowly. During the growing period, pay attention to water control and loosen the soil promptly.
Ranunculus Mosaic Disease
Symptoms
Chlorotic spots appear on the leaves, and in severe cases the plant grows and develops poorly.
Control methods
Mosaic disease is in many cases caused by pests, so spray insecticides promptly to control aphids.
During pruning, pay attention to disinfecting tools, and promptly treat wounds after pruning to avoid bacterial infection. Once diseased leaves are found, remove them immediately.