What are the pest and disease control methods for Alocasia macrorrhizos?

The most common pests and diseases of Alocasia macrorrhizos are red spider mites and aphids. The symptoms are yellowing leaves, white spots on the surface, a weak and spindly plant, and webbing on the leaves. For treatment, you can wipe the leaves with a cloth dipped in mild soapy water, cleaning both the underside and the top, then rinse with clean water. For large pots, you can use a spray bottle to clean them, once every two to three days, persisting continuously for a week, and the effect will be quite noticeable.

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Pest and Disease Control Methods for Alocasia macrorrhizos

Diseases of Alocasia macrorrhizos show up on the leaves, and there are generally two kinds: one is leaf spot disease, and the other is anthracnose. For leaf spot disease, you can spray the leaf surface with an 800-fold dilution of chlorothalonil or carbendazim, 2-3 times in succession, with 7 days between each application. For anthracnose, you must spray the leaf surface with a 500-fold dilution of 75% thiophanate-methyl, once every 7 days, 2-3 times in succession, and it can basically be controlled. Because Alocasia macrorrhizos is a foliage plant, once the leaves become diseased, it will inevitably affect its ornamental effect, so prevention should be the priority.

On the stems, there is a kind of wilt disease caused by bacterial infection. This disease is not easy to detect at first, and once discovered it will already be very serious. If you find the stem leaning to one side, or a wilting spot, then it has definitely developed wilt disease. You can use a small knife to cut out the diseased part; the boundary between the diseased part and the healthy part is very obvious, and generally you can snap it off by hand. If the diseased part is less than one third of the stem, you can apply a layer of chlorothalonil solution to the healthy part and keep it dry, then apply it again after ten days, and after 20 days it can basically heal.

The most serious pest of Alocasia macrorrhizos is mites, that is, what is commonly called red spider mites. Red spider mites generally live on the underside of leaves. They not only suck the nutrients from the leaves but also spread various viruses. They greatly affect the growth of the plant, so you must check frequently, and once discovered, treat immediately. You can use medications such as mite killer, Saomangjing, and imidacloprid for treatment. Treatment with medications such as imidacloprid.

In addition, the common pests and diseases of Alocasia macrorrhizos also include snails, scale insects, ants, earthworms, and aphids. The control methods are introduced separately below:

Snail - the shell is slightly thick, glossy, and elongated-oval in shape, with a shell height of 130mm and a shell width of 54mm. It has 6.5-8.0 whorls, the spire is conical, and the body whorl is swollen. Commonly, manual capture is used, or 1-2 cotton swabs with dichlorvos are inserted into the potting soil, then covered with a plastic bag, and removed after fumigating for 2 hours.

Scale insect - the body is orange-red, with black hairs and white waxy substance on the back. Some stick to the branches and stems of the flowers and trees, and some lie on the front of the leaves or among the veins on the underside, and after sucking the sap the leaves turn yellow and drop, and the branches wither. Some also stick like cotton to the branches, stems, and fruit stalks of flowers and trees (because there are many kinds of scale insects, they are not listed one by one). Commonly, a soft brush is used to gently brush them off, then a diluted dichlorvos is applied; or Jiejiening is used for control.

Ant - the body is relatively small and black-brown. You should all know what it looks like specifically. Commonly, a cotton ball with dichlorvos is used and inserted into the hole at the bottom of the pot, or the pot is submerged in water to destroy them.

Earthworm - the body is bilaterally symmetrical, with segmentation; it has no bones, and the body surface is covered with a thin pigmented cuticle. Commonly, a 500-fold dilution of deltamethrin is used to water the potting soil, or a dilution of superphosphate is used to drive the earthworms out of the pot.

Aphid - it is a small green-yellow insect with many species, mostly occurring on the buds, tender stems, tender leaves, or flower buds of flowers. Commonly, a 3000-fold dilution of 40% dimethoate emulsion is sprayed, or a 1000-fold dilution of 80% dichlorvos in water is sprayed.

When using pesticides, note that some plants are allergic to pesticides, and when using pesticides, never use them too concentrated.

The above are the pest and disease control methods for Alocasia macrorrhizos introduced to you by the editor. I hope it can help you. For more information related to Alocasia macrorrhizos pests and diseases, please continue to follow the flower channel.

Pest and Disease Control for Alocasia macrorrhizos

Pest and Disease Control for Alocasia macrorrhizos

Diseases of Alocasia macrorrhizos show up on the leaves, and there are generally two kinds: one is leaf spot disease, and the other is anthracnose.

Leaf spot disease

For leaf spot disease, you can spray the leaf surface with an 800-fold dilution of chlorothalonil or carbendazim, 2-3 times in succession, with 7 days between each application.

Anthracnose

For anthracnose, you must spray the leaf surface with a 500-fold dilution of 75% thiophanate-methyl, once every 7 days, 2-3 times in succession, and it can basically be controlled.

Wilt disease

On the stems, there is a kind of wilt disease caused by bacterial infection. This disease is not easy to detect at first, and once discovered it will already be very serious. If you find the stem leaning to one side, or a wilting spot, then it has definitely developed wilt disease. You can use a small knife to cut out the diseased part; the boundary between the diseased part and the healthy part is very obvious, and generally you can snap it off by hand. If the diseased part is less than one third of the stem, you can apply a layer of chlorothalonil solution to the healthy part and keep it dry, then apply it again after ten days, and after 20 days it can basically heal.

Alocasia macrorrhizos is a foliage plant, and once the leaves become diseased, it will inevitably affect its ornamental effect, so the diseases of Alocasia macrorrhizos should mainly be prevented and controlled.

The most serious pest of Alocasia macrorrhizos is mites, that is, what is commonly called red spider mites.

Red spider mites

Red spider mites generally live on the underside of leaves. They not only suck the nutrients from the leaves but also spread various viruses, seriously affecting the growth of the plant, so you must check frequently, and once discovered, treat immediately. You can use medications such as mite killer, Saomangjing, and imidacloprid for treatment.