rice pest and diseases pdf

Rice Pest And Diseases Pdf

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Published: 06.12.2020

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PlantVillage is an open access public resource at Penn State that aims to help smallholder farmers grow more food. Please consider donating LINK and helping us, help smallholder farmers. Water-soaked stripes on leaf blades; yellow or white stripes on leaf blades; leaves appear grayish in color; plants wilting and rolling up; leaves turning yellow; stunted plants; plant death; youngest leaf on plant turning yellow.

Major Pests and Diseases of Rice in India and their Management

PlantVillage is an open access public resource at Penn State that aims to help smallholder farmers grow more food.

Please consider donating LINK and helping us, help smallholder farmers. Water-soaked stripes on leaf blades; yellow or white stripes on leaf blades; leaves appear grayish in color; plants wilting and rolling up; leaves turning yellow; stunted plants; plant death; youngest leaf on plant turning yellow.

One of the most important diseases of rice; disease found in tropical and temperate regions; greatest economic impact in Asia. Bacterial blight can be effectively controlled by planting resistant rice varieties; avoid excessive nitrogen fertilization; plow stubble and straw into soil after harvest.

Donate Contribution PlantVillage is an open access public resource at Penn State that aims to help smallholder farmers grow more food. This page is available in French. Content Content 1. Physiological disorders. References 5.

Diseases - Bacterial. Pests - Insects. See questions about Rice. Rice terraces in Vietnam. Asian rice with panicles. Rice growing terraces in the Philippines. Asian rice field. Mature Asian rice panicles. Zinc deficiency 2. Symptoms of potassium deficiency. Symptoms of potassium deficiency 3. Nitrogen deficiency 2. Plants showing Phosphorous deficiency. Nitrogen deficiency.

Severe calcium deficit leaves. Symptoms of potassium deficiency 2. Zinc deficiency 1. Common Pests and Diseases Diseases. Category : Bacterial. Advanced leaf streak symptoms in rice field. Initial symptoms of bacterial leaf streak on rice. Bacterial leaf streak. Severely infected rice leaf. Small, water-soaked streaks between leaf veins which are initially dark green and then turn translucent; streaks grow larger, coalesce and turn light brown in color; tiny beads of yellow colored bacterial exudate are common on the surface of the streaks; leaves turn brown and then gray-white in color before they die.

Bacteria survive on infected seed and straw; bacteria may enter the plant through wounds; bacterial exudate can be spread in irrigation water; emergence of the disease is favored by high humidity and high temperatures; bacterial leaf streak is widespread in tropical Asia and West Africa. Management Control of bacterial leaf streak is dependent on the use of resistant rice varieties and on planting of treated seed.

As name suggest we will see scalded appearance on leaves. The lesion is marked with different zone from alternating light tan and dark brown from leaf tips or edges.

As the leaves mature the lesion is with light brown halos. Margins and leaf tips are translucent. The symptoms may vary depends on cultivar, growth stage and plant density.

The disease is severe in Latin America and West Africa. Management Grow resistant varieties. Treat the seeds with suitable fungicide. Apply only recommended quantity of nitrogen fertilizer in split dose. Bacterial blight infected leaf. Bacterial leaf blight infected field and leaf. Bacterial blight infected leaves. Bacterial blight infected field. Management Bacterial blight can be effectively controlled by planting resistant rice varieties; avoid excessive nitrogen fertilization; plow stubble and straw into soil after harvest.

Bakanae infected plant in rice field. Seedlings are elongated, slender and pale; seedlings are stunted and chlorotic; death of seedlings; abnormal elongation of older plants which often makes them visible as they grow taller than uninfected plants in the field; sterile plants which do not produce panicles or produce empty panicles. Disease transmitted through infected seed; disease emergence favored by high temperatures. Management Treating seeds with appropriate fungicides prior to planting can be very effective at controlling the disease; less susceptible rice varieties should be grown in areas where fungicide-treated seed is not available.

Occurs wherever rice is grown; fungus overwinters on plant debris; disease emergence favored by water on surfaces of plant. Management Ensure plants are provided with correct nutrients and avoid water stress; chemical seed treatments are effective at reducing the incidence of the disease.

Cross-section of individual smut grain. False Smut. Individual grain transformed into smut. The pathogen infect the rice plant during flowering stage and causes chalkiness of grain. The individual grains were covered with orange fungal mass in the beginning, later turns into greenish velvet color during sporulation stage and finally into charcoal black during spore maturation stage.

It infect only few grains in spikelet. It also reduces market value of rice. Management Treat seeds with hot water 52 C for 10 min. Roughing the infected plants from field and from harvested grains. Keep the rice field and surrounding clean. Use resistant varieties. Maintain humidity in field by alternate wetting and drying.

Narrow brown leaf spot infected leaves. Short, elliptical or linear brown lesions on leaves; necrosis of leaves; blotchy pattern on leaves; premature ripening of kernels.

Management There are no chemical controls currently recommended for the treatment of the disease; treating seeds with hot water or appropriate fungicides prior to planting can reduce the incidence of the disease. Blast symptoms. Rice blast. Lesions on all parts of shoot; white to green or gray diamond-shaped lesions with dark green borders; death of leaf blades; black necrotic patches on culm; rotting panicles. Most important disease of rice worldwide; causes most damage in areas of intense cultivation; disease emergence favors high soil nitrogen content.

Management If disease is not endemic to the region, blast can be controlled by planting resistant rice varieties; avoid over-fertilizing crop with nitrogen as this increases the plant's susceptibility to the disease; utilize good water management to ensure plants do not suffer from drought stress; disease can be effectively controlled by the application of appropriate systemic fungicides, where available. Water-soaked initial sheath blight lesion.

Sheath blight symptoms. Lesion on rice leaf sheath. Circular, oblong or elliptical, green to gray water-soaked spots on leaf sheaths; lesions with pale green or white center and purple-brown margin; lesions covering leaf sheaths and stems; poorly filled grains.

Occurs in all areas where rice is grown; second only importance to rice blast; most damaging in intensive rice production; spreads rapidly via irrigation.

Management Avoid overfertilizing plants as excessive nitrogen application has been shown to increase susceptibility to the disease; applications of foliar fungicides may be required; two applications are recommended and should be timed so that the first application is made between the early internode elongation and the second application made on emerging panicles days later.

Stem rot infected plants. Symptoms generally begin to appear after the mid tillering stage; black lesions appear on outer leaf sheath at the water-line; lesions expand and begin to infect inner leaf sheaths and culm begins to rot; infections which reach the culm can leaf to lodging of plants, unfilled panicles and death of tillers.

Fungus survives in crop debris in soil after harvest; fruiting bodies are carried to the surface when fields are flooded where they then infect leaf sheaths at the water line. Management Bury crop residue deeply in the soil after harvest; avoid excessive nitrogen fertilization; plant less susceptible rice varieties.

Stunted plants; short, narrow pale green or yellow leaves; mottled or striped pattern on newly unfolded leaves; irregular dark brown spots on leaves; few or no panicles produced;. Transmitted by leaf hoppers; disease widespread in rice growing regions of South and Southeast Asia, southern China, southern Japan and Taiwan. Management Several varieties of rice resistant to the leaf hopper vectors have been developed but the insects have overcome the resistance in several countries; applications of appropriate insecticides can help to reduce populations of vectors in temperate regions.

Tungro virus infected leaves. Tungro virus infected field. Tungro virus infected plant. Plants are stunted with a yellow-orange discoloration; plants may have a reduced number of tillers and rust colored spots on leaves; leaves may be mottled, striped or exhibit interveinal necrosis.

Disease is the most severely damaging virus of rice in South and Southeast Asia; virus is transmitted by leafhoppers. Management Rice varieties resistant to tungro virus have been developed and control the disease successfully; intense cultivation has led to the breakdown of the resistance by some virulent leafhopper strains; in Indonesia, the disease is successfully controlled by scheduling planting to obtain synchronous development and practicing crop rotation with resistant varieties.

Green Leafhoppers 1. Nephotettix virescens 2. Nephotettix nigropictus 3. Nephotettix malayanus Ishihara.

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Rice Diseases and Symptoms: Rice is the major food crop in Asia. It is the staple food in most states, particularly in India. Nevertheless, an IRRI report by the International Rice Research Institute shows an average worldwide loss of 37 percent of rice yield due to pests and diseases. Many paddy plant pests and diseases are caused by species like bacteria, pillows, and viruses. We will briefly describe the most commonly occurring rice pests and diseases pdf on the Asian continent. At the end of this tutorial, you will be able to learn about and treat different types of rice diseases.

Skip to search form Skip to main content You are currently offline. Some features of the site may not work correctly. Jena and Rath Pc and A. Mukherjee and S. Raghu and G. Pandi and G. Basanagowda and G.


DISEASES. 1. Rice Yellow Mottle Virus (RYMV). 2. Rice Blast. 3. Brown spot. 4. Sheath Blight. 5. Sheath rot. 6. Leaf scald. 7. False smut. 8. Kernel smut. 9.


Major Pests and Diseases of Rice in India and their Management

Skip to main content Skip to table of contents. Advertisement Hide. This service is more advanced with JavaScript available. Pest Management in Rice. Editors view affiliations B.

This article is a List of Diseases of rice Oryza sativa. Ceratobasidium oryzae-sativae Rhizoctonia oryzae-sativae [anamorph]. Curvularia lunata Cochliobolus lunatus [teleomorph].

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Pest, Diseases, Weeds of Rice & Their Management. 1. Pests and diseases of Rice. (a) Important Pest. Stage. Pests. Control measures. Nursery. Stem-borer.

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