Is the peony plant looking weak and thin?
Today, the editor will introduce some related experience on the cultivation of peony plants that look weak and thin. Next, the editor will introduce to netizens.
Yesterday, I introduced the four common diseases of peonies. In addition to the four diseases mentioned yesterday, there are also some diseases that peonies are prone to. So let's continue to introduce them today.
1. White Star Disease
White Star Disease, also known as target spot disease, is relatively common on peony flowers. In the early stages of the disease, the lesions on the leaves appear net-like or nearly round, with a diameter of about 4-10mm, and there are many of them, ranging from light brown to grayish white, with brown edges. Old lesions have obvious concentric rings, and gray-black mold-like substances appear in the center of the lesions, which is the spore body of the pathogen.
Prevention is the main strategy for target spot disease. In early spring, before peonies sprout, apply lime sulfur solution to kill germs, which can effectively reduce the incidence of the disease. In the early stages of the disease, apply mancozeb spray once a week for 2-3 weeks to cure.
2. Withered Branch Disease
The pathogen of withered branch disease mainly invades through wounds, and plants with many wounds and weak growth are most likely to occur.
Withered branch disease mainly infects the stems and branches of peonies. When the stem is infected, it shows light brown lesions, which gradually expand into reddish-brown elliptical lesions. The lesions can circle the stem, causing the branches above the lesions to die quickly.
Prevention is the main strategy for withered branch disease. Regularly apply phosphorus and potassium fertilizers to enhance plant resistance, reduce the occurrence of wounds, and once the disease occurs, spray the entire plant with carbendazim or mancozeb solutions, and apply fungicides to the infected area for treatment.
3. Brown Spot Disease
Brown spot disease is very similar to black spot disease, and it causes the most severe harm during the rainy season with high temperature and humidity. It is a fungal disease. The disease starts from the lower leaves and gradually spreads upward. Initially, it appears as round or oval purple-brown spots, later turning into black spots with clear boundaries. In severe cases, the lesions can connect and cause the leaves to turn yellow, affecting flowering.
Prevention of brown spot disease can be done by spraying carbendazim before sprouting in early spring. After the disease occurs, apply mancozeb or carbendazim for treatment, once every 5-7 days, for 2-3 times.
4. Root Knot Nematode Disease
Compared to other diseases, the control of root knot nematodes is more troublesome.
Is the peony plant looking weak and thin?
After the root knot nematode invades, it will produce irregular nodules of varying sizes in all parts of the fine and thick roots, which are called root knots. They are yellowish-white and smooth on the surface at the beginning of infection, and will turn brown and rot when severe.
Root knot nematodes can cause peonies to shed leaves prematurely. In severe cases, all leaves may fall off by August. Continuous occurrence can lead to dwarfing of the peony plants, small leaves, small flowers, or even no flowering.
Prevention is better than treatment for root knot nematode disease. If diseased seedlings are found before planting, they should be treated promptly, either by soaking in 0.1% methyl isothiocyanate for 30 minutes or in warm water at 48-49°C for 30 minutes. Disinfecting the potting soil before planting can effectively prevent the disease.
Although the Green Plant Enthusiast Network has shared a lot of knowledge on peony cultivation, enthusiasts often encounter some problems during cultivation. Starting tomorrow, the Green Plant Enthusiast Network will discuss common problems and their solutions in the peony cultivation process. Welcome to continue following.
The above methods for dealing with weak and thin peony plants introduced by the Green Plant Enthusiast Network [www.lvzhimi.com] are for reference only.