What should I do if the konjac temperature is too high and the leaf blight is too high?

1. Symptoms: Bacterial leaf blight mainly damages leaves. At the beginning, the edge of the leaf is black-brown irregular shape soaked in oil, and then it appears black wither, causing the leaf to be twisted. In the later stage of the disease, the lesions fuse into patches, resulting in a large number of dry leaves and lodging of plants.

When the air humidity is high, white pus appears and has a slight odor.

2. Pathogen: caused by monas konjac bacteria such as rapeseed. The thallus is rod-shaped, mostly solitary, obtuse and rounded at both ends, with 1-2 unipolar flagella.

The suitable growth temperature is 25-30, and the maximum temperature is 30-39. Aerobic. It mainly overwinters on diseased residues in the soil, spread by wind and rain, and is prone to occur in high temperature and rainfall and continuous cropping.

3. Prevention and control methods.

1) Do a good job of taro storage, select high-lying plots, use open field overwintering mulching method to store taro, and the planting plots should not accumulate water, and the deep ditches and high furrows should be used.

2) Select seed taro, turn the fruit for 1-2 days before sowing, soak the seeds with 500ppm agricultural streptomycin for half an hour to 1 hour, and sow after drying.

3) During the growth period, check frequently, and dig up the diseased plants in the center immediately. And irrigate the holes and surrounding plants with 500 ppm of agricultural streptomycin 2 times, liters per plant, or inject the plants with 100 ppm of agricultural streptomycin, 3-4 ml per plant each time. In addition, it can also be sprayed with 400 times of 30% green debao suspension or 4000 times of 72% agricultural streptomycin.

Harm. Symptoms] is mainly harmful to the leaves, at the beginning of the leaves on the black brown irregular shape of the blight, causing the leaves to be distorted, the later stage of the disease spots into a piece, resulting in a large number of leaves dry, plant lodging.

Pathogen] The pathogen is Xanthomonas campestris, Patel et Singh)Dye, synonym (Uyeda) Burk, a genus of bacteria. (1) Morphology.

The thallus is rod-shaped, large (, predominantly solitary, obtuse at both ends, with 1 2 unipolar flagella. (2) Characteristics. Suitable growth temperature 25 30, maximum 30 39, aerobic.

Gram negative.

The pathogen is mainly overwintered on the diseased residues in the soil, and is spread by wind and rain, and is prone to disease in high temperature and rainfall and continuous cropping sites.

Occurrence regularity] The pathogen overwinters in the soil and bulbs, and invades the plant from stomata or wounds in the following year; The disease began in early to mid-June, peaked in late August and early September, and then gradually stopped developing as the temperature dropped. Poor drainage and overcrowded plants are used for the occurrence of this disease; Underground pests such as grubs are the pests, forming wounds that are prone to this disease, and excessive fertilization aggravates the epidemic of the disease. Epidemics during storage are caused by infection of diseased bulbs harvested in the field.

(1) Agricultural control. Do a good job of planting taro for storage. The storage cellar selects high-dry plots and adopts the storage method of "outdoor soil covering film".

Choose to plant without stagnant water, and do deep ploughing and fine raking, high ridges and deep ditches, and planting in small plots. (2) Chemical control: Do a good job in seed selection, drying and soaking, select healthy taro to dry for 1 2 days and then soak it with 500mg kg of streptomycin sulfate for 1 hour, dry the next seed.

Strengthen inspections and timely pesticide control. If the central diseased plant is found, it is immediately dug up, and the diseased hole and surrounding plants are irrigated with streptomycin 400mg kg for 2 times, each plant is litre of liquid or 10000mg kg of streptomycin is injected into the plant, and each plant is injected with 3 4ml of liquid medicine each time.

Root rot, when the damage is light, the aboveground leaves fade green and yellow, and the petioles wilt until they die in the later stage; In severe cases, most of the roots turn black and rot, causing the plant to wilt and die, which has a great impact on the bulb. Root rot is generally a leaf blight occurs in poorly drained clayey soil and a large number of konjac applications, mainly because there are pathogens in the soil through the wound or stomata of the injured konjac to invade, resulting in konjac infection with leaf blight, when the leaf blight occurs, the leaves wither, so that the leaves can not carry out photosynthesis, resulting in konjac.

<> mainly damage leaves, petioles and bulbs, the tip of taro is bent at the seedling stage, or the petiole and seed taro rot; The leaves are infected with disease, and the initial moist dark green spots are enlarged, and the tissues decay after enlargement; The fungus is impregnated with leaf veins and petioles along the ducts, and water-stained stripes appear, and there is a sap flow blight disease is the most common disease in konjac production, which is initially manifested as konjac leaves gradually turning green, and then slowly turning yellow, and the stems and leaves are wilting and drooping, and in severe cases, the roots of the konjac petioles are rotten, and the plants are lodging, especially during the day, and there seems to be at night.

Whether the konjac seeds have rotted, if in the same area, the planting time is probably the same, other people's seedlings have emerged, and yours has not yet emerged, then you should dig out the konjac seeds to see if they have rotted. Usually planting a generation of konjac seedsKonjac planting time is also a more important issue, because there are certain differences in temperature and climate in various parts of China, so it is necessary to understand the local climatic conditions when planting.

It spreads everywhere in the field, and as long as it comes into contact with the germs, it will be infected and become sick secondarily. In this way, ten to hundred, there will soon be a large area of konjac death, if you encounter the high temperature weather after the rain, the heat of the soil can inactivate the soft rot bacteria, but can not be completely **, there is a problem with the operation method. Based on twelve years of biological agricultural research and practice, especially work on konjac soft rot.

Mainly because of the invasion of injured konjac wounds or stomata, resulting in konjac infection with leaf blight, leaf wilting at the onset of leaf blight, unable to photosynthesize, resulting in konjac wilting and death, and leaf blight is highly contagious.

Temperature, konjac bulb begins to germinate at about 5, the temperature suitable for germination is 20-25, higher than 45 or lower than 0, after about 5 days, the bud is damaged and died. The buds grow slowly below 15 and above 35 quickly, but they are delicate, and the leaves are rolled and yellowish when the leaves emerge.

If the planted konjac begins to die soon after the emergence of seedlings, it means that the konjac has been infected with wilt disease, and the cause is that the plant wilts and dies due to the konjac wilt fungus.

The best role of crops is to elongate the plant roots, so that the plant roots maintain a good growth, promote the absorption of soil nutrients by plants, and thus achieve the effect of increasing yield and income The author is slightly familiar with the southern fruit trees, and the following is used as a starting point to talk about the part that needs to be paid attention to in the role of calcium on fruit trees. The effect of calcium on fruit trees Calcium can maintain the stability of cell wall, cell membrane and membrane-bound proteins, and has a positive effect on maintaining peel toughness and preventing fruit cracking.

Summary. Konjac seedlings and white leaves rot are caused by high temperature or plant water shortage, which can reduce the amount of fertilizer, increase the frequency of watering, maintain a suitable temperature and humidity, and scientific fertilization to improve the condition of konjac seedlings and white leaves and rotten leaves.

Konjac seedlings and white leaves and rotten leaves are caused by high hand dust temperature or plant water shortage, which can reduce the amount of fertilizer, increase the frequency of watering, maintain a suitable temperature and humidity, and scientific fertilization, so as to improve the condition of konjac seedlings and white leaves and rotten leaves.

There is no shortage of moisture when the seedlings emerge, but the temperature is slightly higher on a sunny day.

If the temperature is slightly higher when the seedlings emerge, it is necessary to water the plants properly, increase the frequency of watering, and take shading measures that must be rented to quiet the dust to adjust the temperature, and at the same time, it is also necessary to reduce the amount of fertilizer to maintain the humidity of the plants, maintain the appropriate temperature and humidity, and start the code Zen so as not to affect the growth state of the plants, so as to achieve a good effect of seedlings.

1. Clean up the rotten konjac, bury the branches and lime in the rotten konjac soil after cleaning, cover the soil, and disinfect. The rotten konjac after cleaning should be taken away, and the rotten konjac cannot be left in the ground; 2. Disinfect the entire konjac field with quicklime.

3. Konjac soft rot is used to eliminate rot net plus konjac spirit or wilt rick plus garlic oil.

In konjac production, pests and weeds occur to varying degrees. The main diseases are soft rot, white rot, leaf blight, black rot, virus disease, nutrient deficiency and sunburn, among which soft rot and white rot are the most serious. The main pests are sweet potato moth, Spodoptera litura, soybean moth, grub, mole cricket, ground tiger, etc. Weeds are mainly Poaceae and Sedumaceae. Konjac insect pests are not as harmful as diseases, but because only one compound leaf grows a year, the only functional leaf of konjac suffers from insect infestation and the loss is great; What's more serious is that pests will cause wounds after eating, which is conducive to the invasion of germs and causes the epidemic of diseases; The pest control of konjac cannot be ignored.

Konjac is a perennial plant that only grows one leaf a year, and cannot regenerate new leaves after infection; Only by adhering to the principle of giving priority to prevention and comprehensive treatment and comprehensively applying various methods can we reduce the disease to a minimum.

If the continuous cropping land is seriously diseased, it can be rotated with cereal crops for three years to reduce the number of bacteria in the field; In wheat or rapeseed growing areas, konjac can be sown with wheat or transplanted from rape after harvesting. When the konjac is in the ripening stage, it is found that the seedlings have not yet emerged or are emerging, and you can harvest an extra stubble. Konjac likes to get wet, but is afraid of water stains.

The bulb expansion period of konjac is the rainy season in the mountainous area. In order to prevent the outbreak of diseases caused by waterlogging caused by poor drainage, flat stubble cultivation can not only avoid diseases caused by water accumulation in the field, but also thicken the soil layer, increase the temperature difference between day and night, and promote the expansion of bulbs and the growth of aboveground parts. After konjac planting, it should be deeply cultivated once in autumn and winter, and farmhouse fertilizer can be applied according to the land and growth conditions.

Before sowing should be ploughed on a sunny day.

Spraying appropriate urea solution on leaves was beneficial to the absorption of nitrogen fertilizer and increase the chlorophyll content of konjac leaves. Spraying too much urea solution will make konjac leaves behave abnormally. Spraying a 2% urea solution will damage the konjac leaves and curl the edges of the leaves. The effect of foliar topdressing is related to the speed at which the elements are moved through the plant.

Elements with strong fluidity are nitrogen, phosphorus, potassium, sodium, etc. All elements that can move but are less mobile include phosphorus and sulfur, and some of the elements that move include iron, copper, manganese, and molybdenum. Spraying an immobile or low-fluidity elemental fertilizer solution on new leaves is more effective.

Taro seeds are disinfected, manure seeds are isolated, and chemicals are used to prevent and control them in a timely manner, and diseased plants are eradicated in time. To develop taro seed production, it is necessary to persist in the local propagation of taro seeds, with taro farmers as the main body. Mausoleum.

Pest control should first establish the awareness of "prevention first, comprehensive control", from the selection of suitable fields, the selection of non-diseased taro and re-composting high-temperature fermentation, without pathogenic farm fertilizer and bacterial fertilizer. Diseased plants in the field can be controlled by pulling out the disease center, lime blocking, and rounding with the number of orange ambush machine potassium fertilizers. Biological pesticides (such as streptomycin, well-gangmycin, etc.) can also be used, and it is important to select suitable ecological zones and varieties for disease problems.

Use black light and sweet and sour liquid to trap and kill adult insects (that is, 2 parts of sugar, 1 part of wine, 2 parts of water, 2 parts of vinegar, mix well and add a small amount of trichlorfon); Spray with 800 times of 90% trichlorfon or 400 times of 25% carbaryl wettable powder to poison and kill adults; Eggs and larvae are manually removed during peak spawning.

The comprehensive control of konjac pests and diseases should be adopted: cultivation measures that are conducive to the healthy growth of konjac, and the main thing is to worsen the survival conditions of pests and diseases, so it is necessary to take comprehensive control measures for pesticide control.

Do a good job of pastoral hygiene in advance, and the remains of diseased plants. It is also necessary to turn the field deep into the winter kang, which helps to destroy the overwintering place of pests and diseases.

They can be sprayed with insect-repellent pesticides in advance, and they can also be supplemented with more nutrients at ordinary times, so that they can prevent pests and diseases.

Summary. 3. Pay attention to fertilization: Konjac is a plant that likes fertilizer and is afraid of thinness, and the demand for fertilizer is greater than that of common crops.

The best of the fertile soil is extensive, and the deciduous humus of broad-leaved trees can be collected, which has high efficiency and is convenient and easy to obtain, but attention should be paid to fully decomposing, so as not to "burn" the leaves yellow. 4. Pay attention to temperature and humidity: konjac has high requirements for temperature and humidity, if the temperature is high or the humidity is too large, soft rot will often break out.

Therefore, the growth temperature of konjac should be controlled below 30 degrees Celsius and not more than 35 degrees Celsius.

Konjac leaves turn yellow and white.

In general, plants have to photosynthesize, and the cells that carry out photosynthesis are chlorophyllin, and the newly sprouted leaves contain xanthophyllin, and it takes a while for xanthophylin to be converted into chlorophyllin. This is a normal situation.

1. Dry yellow: the yellow of lack of water is not the same as the yellow of water, the yellow of lack of water is the withering and dry leaf tips or edges, and the old leaves are withered and yellow from the bottom to the top, but the growth of new leaves is relatively normal. Workaround:

Take care to keep the soil moist. 2. Lack of fat yellow: It is manifested in the color of young leaves becoming lighter, yellow or light green, while old leaves are more normal or gradually turning from green to yellow.

Solution: Proper topdressing.

3. Lack of light yellow: If the environment is shaded for a long time, the leaves cannot get enough sunlight and cannot form chlorophyll, and the whole leaves turn yellow and then fall off. Workaround:

Timely supplementation of light can prevent the disease. 4. Fat yellow: the yellowing of konjac caused by excessive fertilization or excessive concentration is manifested in the dry brown appearance at the top of the new leaves, the general leaf surface is thick and dull, and the concave and convex are not stretched, and the old leaves are scorched and yellow.

Solution: Fertilizer should be stopped immediately, and part of the fertilizer should be washed with a large amount of cleaning.

5. Burning yellow: strong sunlight directly shines on the shade-loving konjac leaves, which is easy to cause the konjac leaf tips and leaf edges to wither, and the sunny part of the leaves appears yellow spots. Workaround:

Shade is performed. 6. Water yellow: the young leaves are dark yellow and dull, the old leaves have no obvious changes, the branches are small yellow-green, and the new shoots are not long, indicating that there is too much rain.

Solution: Clean the ditch and drain the water.

Konjac field management should pay attention to the following four points 1. Pay attention to sunlight: Konjac likes half yin and half yang, and cannot be exposed to direct sunlight for a long time. Therefore, attention should be paid to intercropping and shading in field management.

2. Pay attention to watering: Watering is an important part of the field management process. Low amount of water, stagnation of leaf development; If the amount of water is too large, it may lead to root rot and death; If the amount of water is moderate, the leaves will be hypertrophied.

The first principle of watering is to rather tide than dry.

3. Pay attention to fertilization: Konjac is a plant that likes fertilizer and is afraid of thinness, and the demand for fertilizer is greater than that of common crops. The best of the fertile soil is extensive, and the deciduous humus of broad-leaved trees can be collected, which has high efficiency and is convenient and easy to obtain, but attention should be paid to fully decomposing, so as not to "burn" the leaves yellow.

4. Pay attention to temperature and humidity: konjac has high requirements for temperature and humidity, if the temperature is high or the humidity is too large, soft rot will often break out. Therefore, the growth temperature of konjac should be controlled below 30 degrees Celsius and not more than 35 degrees Celsius.