What are the pests and diseases of lotus and how to deal with them

Common pests and diseases of lotus flowers include black spot disease, rot disease, Spodoptera litura, and aphids, so attention should be paid to prevention and control.

1. Black spot disease: irregular brown lesions appear on the leaf surface in the early stage, with slight ring lines, and black mold on the lesions in the later stage, often several lesions are connected together to form large lesions, and the whole plant dies in severe cases.

Prevention and control methods: spray 50% carbendazim or 75% chlorothalonil 500 800 times solution in time at the early stage of the disease for prevention and control.

2. Rotting disease: at the beginning of the disease, there are green and wilt patches on the leaf edge, which will expand inward in a piece, and finally the whole leaf will turn brown. After the onset of the lotus, the central part of the lotus root turns brown and gradually necrosis to the lotus root and the lotus peduncle longitudinally.

Prevention and control methods: spray 50% carbendazim 500 600 times liquid for prevention and control at the beginning of the disease.

3. Spodoptera litura: The hatched larvae swarm the back of the leaves to eat the mesophyll, leaving the epidermis and leaf veins, and the infested leaves are gray-white like screens. After the larvae are slightly larger, they disperse their preference, bite the leaves into notches, and can bite flower buds and flowers, and the most harmful is in June and October every year.

Control methods: remove insect leaves in time and destroy them, and spray 1000 times of methamidophos in the evening when the larvae are infested.

4. Aphids: Aphids have strong adaptability to climate and are widely distributed, mainly sucking the stems and leaves of plants, especially the tender parts.

Control methods: Aphids have strong reproduction and adaptability, and the population is huge, so it is difficult to achieve the best results with various methods, and it is necessary to regularly use 80% dichlorvos emulsifiable concentrate spray diluted 500 to 1000 times.

How many people yearn for it is to be accompanied by lotus ponds, surrounded by greenery, watch the sunrise and sunset, watch the smoke curling, look at the fish playing lotus leaves, look at the blue sky for days, stay away from the world, and occasionally invite friends to drink and laugh, and life is very leisurely and comfortable.

Speaking of the theme, lotus cuisine is indispensable as a delicacy on the public table, and the whole body is a treasure with high economic value. It can coexist with aquaculture, killing two birds with one stone. Due to the geographical environment and the restriction of lotus root planting, there is only sufficient water area in some areas to plant a large area. Generally not easy to get sick.

In recent years, the virus disease has been suddenly triggered by abnormal weather changes, and can affect several non-adjacent provinces at the same time. A lot of chemical drugs have been ineffective and easy to exceed the pesticide residues, there is no good drug treatment, it is also a chance that a few years ago Xiantao customers first contacted us from the Internet, and after seeing the figure sent and **, the expert group gave the formula and medication plan, once effective, twice cured, three times consolidated plus prevention in infection**. It has also been used in Shandong, Jiangsu, Zhejiang, Jiangxi, Henan, Guangxi, Guangdong and other places in the follow-up, and there is no problem.

It usually occurs in late spring and early summer when the weather is low and the rain is high and the temperature is high, and the lotus root can occur throughout the growth period, mainly harming the leaves. The diseased plant mainly harms the leaves, and the infected lotus leaves and underground stems can show symptoms, and large angular to irregular light brown blight spots are produced on the leaves. The epidermis of the rhizome produces anthrax streaks, usually shorter than the healthy plants, the leaves are basically close to the water surface, the leaves are thinner, the early onset of the plant is dwarfed obviously, some of the diseased leaves are curled and the leaves are not expanded, some are locally greenish and yellow, some are dark green mottled and leaf-like, some are wrinkled and rough, some of the leaf veins are obviously protruding, and the leaves are deformed.

Once infected, the loss is heavy, it can be spread by asexual propagation materials over long distances, aphids often gather on the back and stem of lotus leaves but non-persistent transmission, there are also individual thrips, whiteflies infected, you can use our medicine before using insecticides to kill insects, try to avoid agricultural work wounds, this is also an element of viral disease infection. It can infect field crops such as taro, konjac, calla lily, calamus, etc. Insufficient fertilization in shallow ponds, extensive management, and too many weeds around, the disease will be more serious.

Conventional medication regimen: lotus leaf initial onset.

There are drugs for the treatment of aphids, and Metarhizium aeruginosa can also be sprayed, which has a high content of bacteria. The following methods can be used, urea plus laundry detergent spraying can control aphids? Yes, because urea has the effect of destroying the chitin of the aphid body wall, the laundry detergent contains the surfactant sodium alkylbenzene sulfonate, which can dissolve the waxy layer of the aphid's body wall and attach to it to form an impermeable and impermeable film, causing the aphid's stomata to be blocked and suffocated.

The preparation ratio of laundry detergent, urea and water is 1:3:300.

To prepare, dissolve the laundry detergent with hot water, then add urea and water, and stir well. Foliar spraying is carried out after 125 grams of urea kilogram and neutral laundry detergent per mu are fully dissolved with 50 60 kg of water.

It can control aphids, red spiders, cabbage insects and other pests on grain, cotton, vegetables, fruit trees and other crops. Spray once every 7-8 days, spray 3 times in a row, the control effect can reach about 95%, and it also plays a role in top dressing.

Precautions: Stir fully when preparation, and do not leave particles, which are easy to cause leaf burning. Spraying should be even, be sure to spray the liquid on the aphids, otherwise it will not work.

Another method of inventing urine wash.

A compound urine lotion is prepared with urea, synthetic laundry detergent or ammonium bicarbonate additives, potassium dihydrogen phosphate, thiourea as raw materials, and its weight ratio is urea, synthetic laundry detergent or ammonium bicarbonate additives, potassium dihydrogen phosphate, thiourea 4 1. This compound urine lotion prepared from urea, synthetic laundry detergent or ammonium bicarbonate additives, potassium dihydrogen phosphate, thiourea as raw materials, can be made into powder or solution (emulsion).

Summary. It is unlikely to be a scale insect, because the scale insect is a small parasitic insect that is not very active or completely fixed on the plant, while the lotus flower only shows its shell and does not find it around.

What are the common and main insect pests of lotus?

Hello, I have seen your question and am sorting out the answer, please wait a while

I only saw the shell on the back of the lotus leaf, but I didn't see the insects, so please ask the teacher what insects caused it.

The shell is dark brown in color.

Has there been any change in the lotus leaves of the lotus flower.

Slightly atrophied. Is the color lightened?

Sort of, but not obvious.

Is it some kind of scale worm.

According to your description, now the bug is in the larval stage and the damage to the plant is not very great. It is initially speculated that the infestation is caused by poor plant growth, shrinking flower buds, poor flowering quality and even no flowering.

It is recommended to spray 50 dithion EC 2000 times, the drug is less toxic to fish, if there are fish next to the lotus, please choose carefully.

Thank you, teacher. It is unlikely to be a scale insect, because the scale insect is a small parasitic insect that is not very active or completely fixed on the plant, while the lotus flower only shows its shell and does not find it around.

You're welcome, I hope it helps you, and I wish you a happy life.