Anthurium Leaves Turning Yellow and Aphids: Pest and Disease Control and Remedial Methods

Common diseases of anthurium include anthracnose and root rot. Anthracnose damages young branches and leaves. The infected parts first show small water-soaked spots; the spots are round or nearly round and appear dark brown. Afterwards, the lesions continuously expand, concentric rings appear, and the central part turns light brown or grayish white, covered with many small black dots, while the edges are purplish brown or dark brown.

Root rot damages the roots. After the plant is infected, the lower leaves wilt first. After pulling out the diseased plant, you will find that some roots appear water-soaked, turn brown or black, and rot. For anthurium diseases, the principle of "prevention first, integrated management" must be adhered to, with focus on the following work:

(1) Do a good job of environmental sanitation and pull out weeds. Before planting, thoroughly disinfect the heating facilities in the greenhouse, and promptly remove and burn fallen leaves, diseased leaves, rotten roots, and diseased plants to reduce the spread of disease.

(2) Choose more disease-resistant varieties. Strengthen the management of temperature, humidity, light intensity, and fertilizer and water, cultivate robust plants, and enhance disease resistance.

(3) After root rot occurs, 25% Ridomil wettable powder at 1500 times to 2000 times dilution can be used for drenching; for anthracnose, 50% thiophanate-methyl wettable powder at 800 times dilution plus 75% chlorothalonil wettable powder at 800 times dilution can be used for control.

Common insect pests of anthurium include aphids and whiteflies. The yellow-tropism of the pests can be used for trapping and killing. The specific method is: take a piece of transparent plastic, size 10 cm x 25 cm, first coat it with yellow pigment, with marigold yellow giving the best effect, then coat it with a layer of No. 10 machine oil. Place the plastic 30 cm to 50 cm above the plants, using 34 pieces per mu.

Pest and Disease Control of Anthurium

Anthurium pest and disease control must adhere to the principle of "prevention first, integrated management."

I. Do a good job of environmental sanitation, and inspect frequently to form a system

1. Eradicate host plants and pull out harmful weeds.

2. Thoroughly disinfect greenhouse facilities and media before planting.

3. Promptly remove and burn fallen leaves, diseased leaves, rotten roots, and diseased plants.

4. Provide visitors with disinfectant soap or 75% alcohol to wash their hands.

II. Put agricultural control first

1. Strict quarantine, and select pest- and disease-resistant varieties for tissue-cultured plantlets.

2. Strengthen the management of temperature, humidity, light intensity, and fertilizer and water, cultivate robust plants, and enhance pest and disease resistance.

3. It is best to use knives and scissors separately for each bed. Prepare several pairs and use them alternately; before use, soak them in 75% alcohol for 3 minutes for disinfection.

4. Manually catch insects, remove diseased and pest-infested leaves, and scrape off scale insects.

5. Improve ventilation and light conditions through pruning (protect the wounds well), so that the anthurium grows robustly.

6. Keep the plants as dry as possible and prevent splashing water.

7. Follow a strict order of operations, doing the most sanitary tasks first.

III. Biological control

1. Protect natural enemies, and prohibit the capture and killing of beneficial birds, frogs, toads, etc.

2. Use beneficial bacteria, fungi, and viruses to control pests.

IV. Physical control

1. Use black light lamps to attract and kill pests.

2. Use yellow sticky boards to trap and stick some pests.

V. Use botanical pesticides

VI. Chemical pesticide control

What are the control methods for common pests and diseases of anthurium?

Anthurium is also often called flamingo flower, and its flower language is great prospects and passion. Common colors of anthurium include red, pink, white, etc., and it has great ornamental value. During the cultivation of anthurium, many pests and diseases will harm its health, and we should control them in a timely manner. Below, the editor will introduce to you the harm and control methods of common anthurium diseases.

Anthurium aphids

Symptoms:

Aphids themselves are light green, yellow, or pink, have 6 legs, and are about 2 mm long. Aphid populations develop very quickly because they reproduce by live birth, and they secrete honeydew, which causes fungal growth. Aphids cause spots on flowers and leaves, thereby reducing commercial quality, and they also suck the plant's sap and then inject toxic sap into the plant tissues, thereby affecting plant growth. Aphids have many plant hosts, thus causing rapid spread of disease.

Control methods:

Spray any one of the following pesticides, and spray again after five days: pirimicarb, heptenophos, bifenthrin, Gaoxiaodagongchen (imidacloprid). Or use natural enemies for control.

Rhizoctonia disease

Symptoms:

The base or roots of the plant are brown or dark brown.

Control measures:

A. Soil disinfection: mix 5 g carbendazim with 25 kg of planting substrate.

B. In the early stage of the disease, drench with 20% tolclofos-methyl emulsifiable concentrate (Rizolex) at 1200 times dilution, or spray with 72.2% Previcur at 800 times dilution.

These are some control methods for common anthurium pests and diseases compiled by the editor. This knowledge is quite helpful for growing your anthurium and allows your anthurium to grow better.

Extended reading:

How to grow anthurium? Anthurium cultivation methods, fertilizing techniques, disease control, and flower language

What to do when anthurium leaves turn yellow

1. Cause: If soil-cultured anthurium develops yellow leaves, it is most likely because it has been watered too much, damaging its roots. Secondly, it may also be because the potting soil has become compacted, or is too alkaline, causing it discomfort.

2. Treatment method: First loosen the potting soil, then take it out of the soil. After that, check the condition of its roots to see whether there are any rotten roots. If there are, they need to be cut off immediately. After handling, prepare some new potting soil with good air permeability and plant it into it.