A Detailed Guide to Common Pests and Diseases of Gardenia and Their Control Methods
Gardenia is a highly ornamental flower that looks pure white and clean, and it is also very versatile, as it can even be used as food for people~ But for many growers, how to prevent and control gardenia diseases often becomes a real headache. Next, this editor will bring you some common pests and diseases of gardenia and their treatment methods, so follow along and take a look!
I. Red spider mite
Damage symptoms:
The red spider mite is a parasitic pest. It often parasitizes the underside of gardenia leaves, feeding on the sap of the leaves as its source of nutrition to survive. Affected by red spider mite parasitism, gardenia will lack nutrients, which in turn causes the leaves to turn yellow and growth to weaken. In addition, red spider mites reproduce very quickly in high-temperature and dry environments.
Treatment methods:
1. If the environment is very dry, you can often spray some water mist and use some humidifying measures to raise the humidity. At the same time, this also has a certain effect of lowering the temperature, thereby inhibiting the reproduction of red spider mites and not creating favorable conditions for their reproduction. 2. If red spider mites are found, you can immediately rinse with clean water to directly eliminate them. 3. If conditions at home allow, you can soak yellow tobacco leaves or leftover unsmoked cigarette butts in water and then spray the liquid, which gives a better insecticidal effect.
II. Scale insects
Damage symptoms:
Scale insects are pests that survive by sucking the sap of the plant. Although these insects are small in size, their destructive power is great. In mild cases of affected plants, the leaves turn yellow and fall off and the plant's growth weakens; in severe cases, the whole plant dies. The impact on the growth and development of gardenia is very great.
Treatment methods:
Scale insects are relatively small and often gather in piles in one place, and they secrete a waxy substance that looks like a pile of white wax powder from a distance. You only need to pick them off with a wooden stick and crush them to death, or eliminate them by spraying a 1000-times solution of 80% dichlorvos. Every year in early spring, spraying gardenia with 0.2-0.5 degree lime sulfur mixture can kill the eggs. This method has a great effect on preventing the occurrence of pest damage.
III. Gardenia leaf spot and blight
Damage symptoms:
Leaf spot and blight is a disease caused by fungi, and the main part it damages is the leaves of gardenia. When the disease occurs, the gardenia plant will show round yellowish-brown lesions with a diameter of 2-4cm, and there will be many small black dots on the leaf edges. Do not place gardenia in a very humid environment, otherwise it will increase fungal reproduction and thus raise the incidence of the disease.
Treatment methods:
When growing gardenia, be sure to pay attention to indoor ventilation and light transmission, reduce air humidity, and water appropriately. If conditions allow, the plant can be placed outdoors for cultivation. In the early stage of the disease, promptly remove the diseased leaf parts to prevent infection of other leaves, and place the infected plants separately from other normal uninfected plants to avoid cross-infection. When the plant is diseased, you can spray Bordeaux mixture or zineb solution for control, spraying 3-4 times a day, once every 7-10 days, and it can be cured.
IV. Gardenia chlorosis
Damage symptoms:
Gardenia chlorosis mainly damages the leaves of the flower and is a physiological type of damage. When the disease occurs, the leaves gradually turn yellow, and the plant grows slowly and gradually wilts.
Treatment methods:
If the plant is found to be turning yellow, you can spray a 0.2-1% ferrous sulfate solution on the leaf surface or pour it at the roots. When pouring at the roots, the concentration can be adjusted higher. It is best to spray after the morning dew has completely dried, and let it bask in the sun after spraying. If the yellowing is very severe, it can be sprayed once every week, but be sure to control the concentration of the solution well to avoid burning the roots. After a period of time, the plant leaves will return to their original green color.
IV. Gardenia sooty mold
Damage symptoms:
Gardenia sooty mold mainly occurs between the branches and leaves. When the disease occurs, brownish-white lesions appear on the branches and leaves, causing branch growth to stop and the plant to gradually wilt.
Treatment methods:
When the disease is found, promptly use clean water to wipe off the white fungal growth on the branches and leaves, or spray 1000-1200 times carbendazim and Baume degree lime sulfur mixture for comprehensive treatment.
V. Gardenia rot
Disease symptoms:
It mainly damages the main trunk of the plant. Below the main trunk, the stem will become swollen and split, and the main trunk gradually shrinks and rots.
Treatment methods:
When the flowers fall, promptly cut off the withered branches and thin out the branches to reduce nutrient consumption and thereby promote the growth of the main trunk. If stem rot is found, be sure to remember to scrape off the rotten parts in time and apply 5-10 degree lime sulfur mixture several times.
The above are the common diseases of gardenia and their treatment methods. I hope this article can help you and let your beloved flowers grow healthily! If you want to learn more related knowledge, please pay more attention to this site!