What s the problem with the green onion and onion scale moth pest? What are the dangers of green oni

The onion whisker scale moth is also called the green onion moth and the leek moth, which mainly harms lily vegetables such as leeks and green onions. When the green onion scale moth harms the green onion, the larvae eat the inner epidermis and mesophyll in the green onion leaves, leaving the outer epidermis, forming irregular white spots on the green onion leaves, and the upper part of the green onion leaves turns yellow and dies after being damaged. As a result, the yield of green onions decreases and the quality deteriorates, resulting in a decline in the income of farmers.

The insect eats the green tissue of the leaf with its larvae, forming an irregular radial white insect path, and can also eat into the onion and garlic bulb, causing rot. The affected plants show yellowish leaves, wilting, and even die in patches, peeling off the stems and leaves, it can be seen that the initial instar larvae are pale yellow, the mature ones are green, and the large body length is about 8 mm. As the larvae grow, the amount of feed gradually increases, and it shifts to the base of the leaf, often leaving green feces at the bifurcation at the base of the leaf.

Allium whisker scale moth, also known as green onion moth, leek moth, belongs to the vegetable moth family pest, is a common pest on lily vegetables such as onions, leeks, onions, etc., mainly harms the leaves, and when the heart leaves turn yellow, reducing the yield and quality.

Green onion shallot moth insect pest refers to this pest specifically to feed on the leaves of green onions, and to survive, is the natural enemy of green onions, it has the following harm to green onions, it is attached to the leaves of green onions, will make the leaves of green onions almost nothing, the leaves of green onions are eaten, will cause green onions to grow not high, the leaves are bare, so that there is no edible value.

1. Pests: mainly leafminers, allium thrips, beet armyworm, etc.

Control method: At the peak of nymph occurrence.

During the period, spray 2 000 2 500 times of 10% imidacloprid wettable powder, spray 1 time every 7 l0 d, and control 2 3 times continuously. In the early stage of adult occurrence and larval leaf miner, 2 000 3 000 times of % avermectin emulsifiable concentrate was sprayed, sprayed once every 7 l0 days, and 2 3 times in a row.

2. Diseases: mainly purple spot disease, downy mildew, virus disease, etc.

Prevention and control methods: purple spot disease: timely uproot the diseased plant or remove the diseased leaves and flower stalks, and bury or burn them deeply; At the initial stage of the disease, spray 75% chlorothalonil, 500 600 times of wettable powder or 500 times of 70% mancozeb wettable powder or 500 times of 64% alum wettable powder, etc., and the above agents were used alternately, sprayed once every 7 10 days, and 2 3 times of continuous control.

Downy mildew: At the initial stage of the disease, spray 500 600 times of 25% methalonil wettable powder or 75% chlorothalonil wettable powder, spray once every 7 days, and spray 3 or 4 times in a row.

Viral disease: early detection of diseased strains and timely pull-out, concentrated deep burial or burning. Strengthen fertilizer and water management and timely control of aphids. At the initial stage of the disease, spray 500 times of 20% virus A wettable powder and spray 2 3 times continuously.

Common pests and diseases of green onions include soft rot, purple spot, and diving flies.

1. Green onion soft rot.

Illness and Harm:

Green onion soft rot is caused by bacteria, high temperature and humidity, mechanical injury, insect mouth injury is easy to cause disease epidemic. The symptoms of the disease are that the aboveground part of the green onion is lodging, easy to pull up, the lower part of the stem is rotten, and there is a foul smell.

Prevention and control methods: 1. Keep the field drainage smooth, and no water accumulation after rain; Control pests in time to prevent disease transmission, and avoid damaging green onions when cultivating soil.

2. The agent can be controlled by 77% 500 times of liquid and 72% of 4000 times of agricultural streptomycin sulfate.

2. Purpura disease.

Illness and Harm:

Purple spot disease mainly damages leaves and peduncles. At first, it appears as a water-stained white dot, then becomes a light brown round or spindle-shaped slightly depressed spot, and continues to expand to brown or dark purple. The disease is severe in the warm and humid summer, and the disease is severe in old seedlings and fields lacking fertilizer.

Prevention and control methods: 1. Alternate crop rotation.

2. At the beginning of the disease, spray with chlorothalonil 500 times or alum 500 times or promethine 1500 times. 1 time in 7-10 days, 3-4 times in a row.

3. Onion rust.

Illness and Harm:

Onion rust is mainly harmful to leaves, stems and peduncles. Initially orange-yellow or black-brown sores are scattered, and then orange-yellow or dark brown powder is scattered.

Prevention and control methods: 1. Apply enough organic fertilizer and increase phosphorus and potassium fertilizer.

2. At the beginning of the disease, mancozeb 1000 times or chlorothalonil 500 times liquid spray. 1 time in 10 days, 2-3 times in a row.

Fourth, the fly of the dive. Illness and Harm:

The larvae feed on the mesophyll tissues and eat the mesophyll, causing reduced yield and quality, and at the same time spreading diseases. The area is harmed from mid-May to the end of October.

Prevention and control methods: 2% avermectin 3000 solution for prevention and control. The time of medication should be in the morning.

Leaf blight often occurs in the planting process of many crops, often causing certain economic losses to growers, the disease mainly harms green onion leaves and flower stalks, the disease starts from the tip of green onion leaves, presents white round spots, and then gradually expands to different shapes and sizes, gray and yellow. Do a good job in field management, remove the diseased leaves and diseased flower stalks in time, take them out of the field to bury or burn them after the removal, and remove the diseased branches in the field in time after harvesting the green onions, and burn them in a centralized manner, so as to reduce the reproduction of the field fungus. color to grayish-brown, the lesions are patched into large blight, the dry area reaches 1 3-1 2 of the leaves, and there is a darker band than the lesion at the edge; The boundary between disease and health is clear.

Later, some small black spots are produced on the lesions. The diseased leaves turn yellow at the early stage, and the yellow part gradually turns brown Protective agent: In the early stage of growth, you can choose to use 80% Dasheng (mancozeb) wettable powder 400 times liquid (or 70% mancozeb wettable powder 500 times liquid) for spray control, 1 time in 10 days, 2 3 times, has a preventive effect on the disease.

<> mainly damage the leaves and peduncles, the leaf damage mostly starts from the tip of the leaf, the initial white dots, after the expansion of the irregular, gray-white or gray-brown lesions, the tip of the leaf is dry, the diseased part can give birth to black mold, and the diseased leaves die. The susceptibility of flower peduncle is easy to be caused by the fungus infection of Glucospora fungus, which is a major disease in the growth process of green onions and garlic.

2.Strengthen cultivation management and control the occurrence of diseases. The planting land should be well drained, the soil should be fertile, and the organic fertilizer and flushing fertilizer should be increased.

Control planting density, strengthen cultivation management, and control the occurrence of diseases. The planting land should be well drained, the soil should be fertile, and the organic fertilizer and flushing fertilizer should be increased. Control the planting density to ventilate and transmit light, reduce foliar moisture, and reduce the chance of infestation.

Change to drip irrigation or running water.

The first is the common special pests and diseases, and then there are insects in it, the second point is the kind of black poison, and then the green onions will grow a lot of black dots, and the third point is that if you want to prevent it well, you should spray pesticides.

Hello I am happy to answer your questions, 1. Pests: The main insect pests of cultivated green onions are leaf miners, allium thrips, beet armyworm, etc. Prevention and control methods:

At the peak of nymph occurrence, spray 2 000 2 500 times of 10% imidacloprid wettable powder, spray once every 7 l0 d, and control 2 3 times continuously. In the early stage of adult occurrence and larval leaf miner, 2 000 3 000 times of % avermectin emulsifiable concentrate was sprayed, sprayed once every 7 l0 days, and 2 3 times in a row. 2. Diseases:

The main diseases are purple spot, rust, yellow dwarf and so on. 1. Symptoms of purple spot disease: mainly harmful to the leaves of green onions, the initial appearance of water-stained white dots, and then turn into light brown round or spindle-shaped slightly depressed spots, continue to expand to brown or dark purple, there are often yellow halos around, the lesions have concentric wheel patterns, and when wet, there is black mold on the affected part.

When the disease is severe, the whole leaf dies. Prevention and control methods: (1) apply sufficient basal fertilizer, timely top dressing, and enhance disease resistance; Pay attention to drainage in the rainy season, control irrigation after the onset of the disease, prevent the aggravation of the disease, and prevent and control the allium thrips as soon as possible.

2) Pharmaceutical prevention and control: 500 times of 75% chlorothalonil wettable powder, 58% methalene manganese zinc 500

Spotted loon. The larvae of the spotted submarine fly are mainly infested by larvae, which will eat in the leaves and constantly eat the mesophyll tissue, resulting in a decrease in yield and quality, and will also spread a variety of diseases, mainly from May to October.

Prevention and control methods: After harvesting, the garden is fully cleared, the diseased and residual plants are taken out of the field, the soil is turned deeply, and the eggs that overwinter under the ground can be eliminated, and poisonous soil can also be poisoned.

Green onion planting four common pests and diseases of the prevention and control method one, soft rot soft rot is a bacterial disease, in the high temperature and high humidity environment is very easy to get sick, in the plant has mechanical wounds or moth-eaten wounds, the fungus infestation, so that the plant infection disease symptoms when the stem and leaves on the ground lodging, stem base rot, foul smell, easy to pull out, the disease in the later stage of the plant is easy to die prevention and control method 1, strengthen management, deep furrows and high furrows, cultivate strong seedlings, timely transplanting, apply sufficient base fertilizer, timely control of underground pests 2, the implementation of crop rotation, and onions, cabbage, cabbage, celery, carrots, potatoes, garlic and other crops in rotation.