Dendrobium pest control methods

Dendrobium has thick stems and leaves and is extremely nutritious, but it is relatively delicate and easily attacked by many diseases and pests. Especially when diseases and pests occur, the diseased parts will rot and cause the death of the plant, which is difficult to control. Therefore, when diseases and pests occur, ineffective prevention and control will cause the number of diseases and pests to increase from a small number and gradually spread, causing huge losses.

anthrax:

When it occurs, it mainly harms the leaves, forming many black spots and causing the surrounding tissues to turn red or gray-green, and the disease gradually sinks. The suitable temperature for the disease is 22 ℃ -28 ℃, and the relative humidity for the disease is above 95% . January to May is the main outbreak period of diseases and pests.

Prevention and treatment methods:

To prevent the spread of the virus when the disease occurs, it is necessary to cut off the infected organs and then spray chemical agents, such as 800 times the solution of 50% carbendazim .

2. In the early stage of the disease, use 65% Zineb 600-800 times liquid for prevention and control and spraying.

3. Spray 50% carbendazim diluted 1000 times 2-3 times. To prevent and control the infection of the disease.

Xanthelasma:

It usually manifests as inconspicuous leaf disease. In the early stage of the disease, the leaves appear as an inconspicuous light yellow color, which then expands into unclear yellow spots. Sometimes black mold appears on the back of the spots.

When cultivating, appropriate density should be adopted, excessive watering should be avoided, and early and fast growth of plants should be promoted to enhance resistance.

When the disease occurs, use 1000 times powder of 75% Benomyl for prevention and control. Fertilize once every 1-2 weeks, and need to be fertilized 2-3 times in a row.

Disease:

It mainly harms the leaves and above-ground parts of Dendrobium. In the early stage of infection, the leaves appear as water-soaked spots, which then expand into dark brown and rotten states, and sometimes there is a thin white mold layer on the surface.

Prevention and treatment methods:

Cut off the affected parts promptly and isolate the diseased plants separately to prevent infection.

Use 25% metalaxyl 600 times powder for spraying prevention and control.

Leaf blight:

The disease usually starts at night. In the early stage of the disease, small brown spots appear on the leaf tips. Sometimes adjacent spots form large spots. In severe cases, it will cause leaf blight .

Prevention and treatment methods:

Remove the diseased leaves in time at the early stage of the disease, spray 600 times the solution of 75% thiophanate-methyl wettable powder , spray once every ten days or so, and spray continuously 2-3 times.

Sooty Disease:

It mainly harms the leaves of Dendrobium. When the disease occurs, the surface of the leaves of the entire plant is covered with a layer of soot-black powder, which seriously affects the management and function of the leaves. In the early stage of the disease, gray-black and charcoal-black sooty bacteria colonies are produced on the leaves and distributed locally on the leaf surface and near the veins. In severe cases, the entire leaf surface will be covered. Causes stunted growth of the plants. March to May is the main outbreak period of this disease.

Prevention and treatment methods:

The prevention and control of sooty mold disease mainly focuses on prevention, keeping the soil well ventilated, draining water promptly after rain, and preventing and controlling aphids and other sources of infection in a timely manner.

When the disease occurs, spray 400 times diluted 40% miconazole powder in time , spray once every two weeks, and spray continuously for 2-3 times.

Use 1000 times diluted 50% carbendazim solution to spray 1-2 times for prevention and control.

Spot disease:

The disease mostly occurs on the leaves. Initially, there are small brown spots, which gradually expand and turn gray-brown in the center. Small black spots gradually appear on the surface of old lesions, the affected leaves turn yellow and fall off, there are differences between varieties, and growth and development are significantly poor, which occurs around March to May in early summer .

Prevention and treatment methods:

Remove diseased leaves and dispose of them promptly.

For chemical control, spray 75% Benomyl with a wettability of 600 times at the early stage of the disease, and spray every ten days or so.

Brown rot:

It usually harms the leaves or stems of Dendrobium. When infected, small yellow spots first appear on the leaves of the orchid, which then gradually turn chestnut brown. The disease gradually rots and then destroys the leaves, causing them to fall off and endangering the entire plant.

Prevention and treatment methods:

Once the plant is damaged, the diseased leaves should be removed in time, leaving the pseudobulbs, and then sprayed with chemical agents. Spraying 3-5 times in succession will be enough.

There are also many other uncommon diseases such as soft rot, leaf rot, brown rot, mosaic disease, viral disease, etc. which I will not introduce one by one.

Pest Control:

The pests of Dendrobium are not serious. The main pests are:

Dendrobium philippinum

symptom:

It parasitizes on the edge or back of the leaves of Dendrobium plants, sucks juice, causes the whole plant to turn yellow and wither, and in severe cases causes the entire plant to turn yellow and die, and causes sooty mold disease.

Prevention and treatment methods:

Its incubation period is in late May, and it can be prevented and controlled by cutting off old branches and leaves and burning them. Or use 4000 times diluted insecticide solution for concentrated spraying.

snails

symptom:

They mainly hide on the back of leaves to feed. This pest can occur many times a year. Once it occurs, it is extremely harmful and can often eat the entire plant beyond recognition in just one night.

Prevention and treatment methods:

Use pesticides to spray in places where they often move to poison them. Pay attention to the cleanliness of the cultivation site and remove dead branches and leaves in time.