चावल बर्बादी

Class: कवक
Common Name: चावल बर्बादी
Scientific Name: Magnaporthe oryzae and Magnaporthe grisea
Potential Host:



The name of the disease is derived from the visual symptoms it causes to rice plants. When conditions are favorable, plant tissues become undergo necrosis and heavily infected leaves will appear burnt from a distance.

Rice blast can cause lesions on leaves, leaf collars, nods, stems, panicles and grains. In about 90% of the time, panicles and grains exhibit visual symptoms, while leaf sheets and roots do not show symptoms.

Initially, purple spots are formed on young leaves. With time, the spots become spindle-shaped. Large lesions usually develop a diamond shape with grayish center and brown margin. Infection on the necks can be fatal; it can lead to a condition called neck blast in which the entire panicle might fall over.

Who Am I?

Rice blast disease is the most devastating plant diseases in rice. The damages it can inflict and potential yield losses are so great that rice blast disease has been ranked among the most important plant diseases in the world. Rice blast is found throughout most of the rice growing countries.

The disease favors temperatures around 24 degrees Celsius and long periods of high moisture conditions, which are commonly found throughout flooded rice fields.

The fungus produces conidia (spores of an asexual reproduction). Under windy conditions, conidia become airborne, eventually descending on other rice plants where it will germinate and cause new infections. When warm and wet weather is present, the formation of new conidia occurs within hours. Sources of inoculum include infected seeds and overwintering of spores on volunteer plants.

Control Measures

रोग प्रतिरोधक पौधों की भिन्न प्रकारों और बीजों का प्रयोग करें।.

उच्च गुणवत्ता वाले पौधे लगाने व रोग-मुक्त बीज की सदैव अनुशंसा की जाती है।

पर्याप्त स्थान बनाए रखें : अत्यंत सघनता वाले पौधे लगाने से बचें ताकि रोशनी प्रवेश कर सके।

पर्याप्त उर्वरण : अक्सर नाइट्रोजन उर्वरकों का अत्यधिक प्रयोग उपज में महत्वपूर्ण बढ़ोतरी नहीं होने देता है और चावल बर्बादी के नये संक्रमण बढ़ा देता है।

स्वच्छता : खरपतवारों, पौधे के अवशेषों, क्षतिग्रस्त भागों, अवांछित पौधों की वृद्धि, और आस-पास के खेती न किये गये क्षेत्रो और असुरक्षित पोधों को हटा कर आस-पास के क्षेत्र साफ रखें।

विश्व के एक अथवा अधिक भागों में प्रयोग किये जाने वाले उत्पादों में निम्न सामग्रियाँ हो सकती हैं :

हेक्साकोनाज़ोल, ट्राइसिक्लज़ोल, प्रोक्लोराज़, कारप्रोपामिद, एजोक्सित्रोबिन, और कार्बेदाज़िम

*Names marked in red are considered to be highly poisonous to beneficial insects.

*Names marked in green are considered to be organic and IPM (integrated pest management) compatible.

Caution and careful notice should be taken when using any plant protection products (insecticides, fungicides, and herbicides). It is the grower’s sole responsibility to keep track of the legal uses and permissions with respect to the laws in their country and destination markets. Always read the instructions written on labels, and in a case of contradiction, work in accordance to the product label. Keep in mind that information written on the label usually applies to local markets. Pest control products intended for organic farming are generally considered to be less effective in comparison to conventional products. When dealing with organic, biologic, and to some extent a small number of conventional chemical products, a complete eradication of a pest or disease will often require several iterations of a specific treatment or combination of treatments.

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