Rice

Rice disease

Rice disease that destroyed the rice until it was damaged. It is caused by many pathogens such as fungal infections and viruses. In addition, nematodes It is very small to see with the naked eye. It can cause rice disease as well, so the major rice disease. It is divided into the following.
Burns
Diseases caused by fungus

Major diseases include burns, leaf rashes, leaf spots, brown spots, acacia

1. Blast disease

This disease is common pandemic. In all parts of Thailand It is caused by the fungus Pyricularia oryzae (Pyricularia oryzae), which the fungal seed (conidia) of this fungus. Spreads by blown to the wind, so the fire is spread by the wind. When the seeds of fungal infection fall on the parts. High moisture content It will sprout fiber to destroy the normal rice, this disease will cause the seedlings of the wound. The shape is round or gray, and sometimes the edges of the scar are brown. When rice leaves are germs. Severe damage Each leaf will have a number of lesions, causing the leaves to dry. If the leaves are large. Dry to death because of disease. Eventually, the seedlings will dry out, too. In addition, the fungus can make the rice rot is brown. Therefore, the fungus can cause rice disease from the period. Seedlings For Thailand, this disease is very severe in the rainy season. In the early stages of drought, the seedling and the outbreak of disease are much stronger. If the farmers grow rice with no resistance. And fertilize the nitrogen fertilizer in the soil.
Prevention and Elimination There are several ways.

1. Planted with rice varieties that are resistant to burning diseases, such as Tail 71. B. 6 b. 7 b. 8 b. 13

2. The seedling in a 50 cm wide plot and the length of the plot parallel to the wind direction. To reduce the moisture between the rice.

3. Nitrogen fertilizer is not too high, depending on the level of resistance of the rice.

4. Use chemicals sprayed on rice such as cauliflower (kasumin) benlate (benlate). Hinosan (hinosan) sprayed every 7 days, 2 times is enough.

1. Elongation disease

This disease is especially severe in the North. Other parts of the epidemic are very small. Gibberella fujikuroi. Symptoms of the disease are visible within 45 days of blackening. The disease is less severe, yellowish, pale and taller than other plants, so it can be seen clearly. In addition, the diseased rice plants have special roots. The above water level in the field. Then the leaves. Near water level in the field. The fiber of the pathogen is pink and then dry out the whole plant. Reproductive germs This disease is spread by the wind. Usually falls in the flower. The fungus is in the grain. This is why the pathogen spread to the seed, because when the seeds are infected with the disease. The disease will destroy the rice. Since seeds germinate. Then show symptoms of the disease to see.
Disease
Disease
Prevention and Elimination Removal Removal The sword is effective as follows.

1. Remove the diseased plant.
2. Planted with resistant varieties.
3. Seed 15 days before planting with chemicals such as Dithane M 45 (daithane M-45). Usually use this drug 0.25 g with 100 g dry seed.
   Brown spots disease
   Brown spots disease. 3. Brown spot disease.

This disease is severely outbreaked in soils with an abundance of bad soil. Especially in some parts of central and southern regions, fungus is named. Helminthosporium oryzae. The seed of this fungus is blown away with the wind. And when it falls on the flowers or rice is not old. The seeds will germinate to destroy the grain. In addition, the fungus can also destroy the starch of the grain, so the grain was destroyed by the fungus. The quality is not good, light weight, take away the color is very broken. The fungus is attached to the grain. Until the fall. When the seeds are fungus. The infection will grow. And propagate Then destroy the seedlings. The leaves of the seedlings are brownish-brown. The width of the spot is approximately 1x2 mm. In addition, the germ can also cause the rice in the shoots and shoots, the spots on the leaves, so the fungus is spread by seeds. And blown away with the wind.
Prevention and Elimination Prevent disease Brown spots by the following methods.

1. Planted with resistant varieties such as varieties. A. 1 b. 2 b. 6. b. 8 b.
2. Use seed chemical before planting, such as seed dressing with ceresan or methane M 45 or Bennett.
   Acacia

1. Acacia (false smut disease)

This disease is commonly spread in high humidity. In the early period, rice was born from the fungus. Ustilaginoidea virens. This fungus destroys seedlings. Then create a lot of seeds and seeds in the seed until it emerges out of the seed. Group of fibers and seeds Reproduction of this seed will be green. Normal in a single The seeds are destroyed, about 5-10 seeds. The spread of the fungus. The method of eradication has not yet been studied. The fungus is destroyed by this disease as a disease of acacia in rice, so the seed from the seed of the disease. May be blown away with the wind. When it falls in the flower. May cause rice plant disease is Acacia.
Diseases caused by bacteria.