Diseases and insect pests of Lotus and their Control methods

1. Black spot:

In the early stage, irregular brown disease spots appeared on the leaf surface, with slight wheel lines, and in the later stage, there were dark black mildew on the disease spots, and several disease spots were often linked together to form large disease spots, and in severe cases, the whole plant withered.

Prevention and control methods:

At the initial stage of the disease, 50% carbendazim or 75% chlorothalonil 500-800 times solution was sprayed in time for prevention and control.

2. Rot:

At the initial stage of the disease, the leaf edge appeared wilted plaques, then connected into pieces to expand inward, and finally the whole leaf turned brown. After the onset of the disease, the central part of the lotus root turned brown and gradually necrosed longitudinally to the lotus root node and stem.

Prevention and control methods:

At the initial stage of the disease, 50% carbendazim 500-600 times liquid was sprayed for prevention and treatment.

3. Spodoptera litura:

The newly hatched larvae gather the leaves to gnaw on the back of the mesophyll, leaving behind the epidermis and veins, and the injured leaves are gray and white like screens. When the larvae are a little older, they disperse the food damage, bite the leaves into niches, and can bite buds and flowers, and the damage is the heaviest from June to October every year.

Prevention and control methods:

The insect leaves were removed and destroyed in time, and when the larvae were damaged, 1000 times solution of methamidophos was sprayed in the evening.

4. Aphids:

Aphids have strong adaptability to climate and are widely distributed, mainly sucking the stems and leaves of plants, especially the young parts. Aphids have strong reproduction and adaptability, and the population is huge. Therefore, all kinds of methods are difficult to achieve the effect of radical cure.

Prevention and control methods:

Regular use of 80% dichlorvos EC spray diluted by 50-1000 times is required.

The above is about the difference between lotus and lotus and the introduction of diseases and insect pests and control methods. For more information, please follow the four Seasons Plant Network!

Common diseases and control methods of lotus bamboo

Common diseases of lotus bamboo: anthracnose, anthracnose

Anthracnose is a common disease of lotus bamboo, which is a serious disease in southern China. Due to the high temperature and long drought in last winter and spring, early-planted lotus bamboos in Zhanjiang, Guangzhou, Taishan and other areas of Guangdong have grown luxuriantly. According to many flower growers, many lotus bamboo leaves to the leaf tip to become dry, and continue to spread to the upper leaves; due to drought and high temperature for a long time, coinciding with rainfall led to disease outbreaks. It was diagnosed as the epidemic of anthracnose of lotus bamboo, and the epidemic occurred ahead of schedule in the middle of March.

The disease began to occur on the leaf tip or leaf edge and leaves, and showed water-stained dark green irregular spots at the initial stage, and gradually spread to the upper leaves; in the middle stage, it was semicircular to amorphous, the edge was dark brown, and the boundary was obvious; in the later stage, the outer edge of the disease spot had a yellow halo, and the middle of the spot was grayish brown or grayish white to yellowish brown. The wheel pattern is obvious or not obvious, and there are small black spots on the disease spot, and the leaves begin to turn yellow and die gradually. Once the disease spot spreads to the leaves, tender leaf buds, the main stem and the base of the leaf stem, when the disease is serious, the stems and leaves will wilt and die quickly. In the rainy and foggy weather, the diseased leaves spread and the plant grew poorly, which seriously affected the effect of leaf viewing.

Control methods of anthracnose of lotus bamboo

To strengthen the maintenance and management of lotus bamboo, it is not suitable to plant too dense; pay attention to avoid frost and frost damage; moist irrigation, reasonable fertilization, increase the application of phosphorus and potassium fertilizer, in order to promote growth and improve disease resistance. In winter and spring, cut off the diseased leaves and clean up the dead leaves, and burn them centrally to reduce the incidence of the disease, and sprinkle quicklime once to sterilize and disinfect the soil, or spray 50% compound carbendazim 500 times liquid to prevent the disease, the preventive effect is better. Improve the field or garden permeability, open field cultivation pay attention to open ditches after rain to drain waterlogging, reduce field humidity, should not be partial application of nitrogen fertilizer. Set up a sunshade net during the growing period to reduce high temperature and strong light exposure. Kill spiders, longicorn beetles, leaf mites and shell insects in time to reduce transmission media.

When diseased plants are found, the disease should be sprayed in time to control the disease. at the initial stage of the disease, 75% chlorothalonil + 70% methyl thiophanate wettable powder (1:1) 600Mel 800x liquid, or 50% compound thiophanate 800x or 50% plus Ruinong WP 600Mel 800 times liquid, the control effect is good. The above agents are used alternately, once every 7 days, and sprayed continuously for 4 times. Generally, it is sprayed quickly before or after heavy rain to control the spread and infection of spores and conidia, and the control effect is better.

Common diseases of lotus bamboo: leaf spot disease

Leaf spot is a fungal disease. The pathogen lives on the diseased body of the plant and can be infected directly from the stomata of the leaves by means of airflow and insect transmission. The disease is easy to occur all the year round in the greenhouse environment and serious in the humid condition.

The leaf spot of lotus bamboo mainly occurs on the leaves. The initial stage of the disease spot is brown spot, the edge is yellow; after expansion, the disease spot is nearly round, gray inside, the edge is dark brown, and the surrounding yellow, and black grains appear on the disease spot under wet conditions.

Control methods of Leaf spot of Lotus Bamboo

During the maintenance period, the plant density should be controlled and the ventilation and light transmission should be maintained. At the initial stage of the disease, fungicides such as Japanese bunker, ethyl phosphorus, aluminum, manganese and zinc were sprayed.

Common diseases of lotus bamboo: stem rot disease of lotus bamboo

The incidence of stem rot will reduce the ornamental, and even cause plant death in serious cases. From May to September, high temperature and high humidity occurred more frequently, mainly for damage to leaves and stems.

The symptoms are as follows: the leaves at the base of the seedling stem yellowed; the base of the stem rotted, yellowed and softened; the interior of the stem turned red; the bacteria gradually damaged upward from the lower incision.

Control methods of Lotus Bamboo Stem Rot

Cultivate robust and tissue-rich plants and seedlings; remove diseased plants and burn them centrally. Soak the incision under the seedling with 42% gram clean powder 3000 times solution, or 88% mycin hydrate 1000 times solution for 24 hours.

Control methods of common diseases and insect pests in anemone

China Garden Network, Oct. 27: the most common diseases of anemone are rot caused by rot mold, Rhizoctonia solani, Botrytis cinerea and powdery mildew caused by powdery mildew.

Rot is a disease that can be caused by several kinds of Pythium, no matter whether the temperature is high or low. It is more likely to occur and spread rot under humid conditions. It can cause germinating seed rot or plant root disease, causing the plant to grow slowly or even die. After being infected by Pythium, the roots and stems of the diseased plants will rot like water stains.

The prevention and control of rot disease, the first is to disinfect the soil, you can use Wulu nitrobenzene or soil bacteria and insects clear seed, soil sterilization and disinfection. If the disease has occurred, it can be used for spray sterilization.

Rhizoctonia can cause Rhizoctonia solani, which prefers a warm and humid environment. Compared with rot, its symptoms are brown and sunken. Sometimes brown macular mycelia can be found in the parts where the diseased plants are connected with the matrix. Antagonistic blight can be killed by MedaIIion and Chipco 26019.

Botrytis cinerea is a disease that can infect seedlings and occur at flowering stage. higher air humidity and water film on the plant surface can promote Botrytis cinerea to infect plants.

The disease can be sprayed with Mancozeb or sprayed with carbendazim.

Powdery mildew is a disease caused by powdery mildew infection. Its symptoms include spiral curling of leaves, round white spots on leaf stems and buds, and the damaged buds can not blossom and curl and stop growing. If the disease is found, spray with 800 times triadimefon immediately. If the condition is serious, spray once every 7-8 days. Three consecutive sprays can basically be controlled.