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Sheath blight

Causal organism: Thanatephorus cucumeris


1. initial infection occur on the stem near the water lime and appear as water soaked oval lesion which often dries and turns tan.

2. All the plant parts are susceptible to infection except roots. Sheath tends to develop in circular areas in the field and cause what are called bird nests.

3. I


Army worm


Local name:

Nature Of Damage of Armyworm:

1. Damage is caused by larvae feeding on leaves from edges, leaving only the midrib and stems.

2. In severe infestation, entire seed beds and fields are destroyed and appears r as if it has been grazed by animals.

Control of Armyworm:

1. Armyworms are held in check


Rice hispa


Local name :

Symptoms for damage of Rice Hispa:

1. Damage is caused by both grubs and adults. Grubs feed by tunneling lower and upper epidermis, resulting in regular translucent white patches.

2. Adults scrap the surface of leaf blade often leaving only the lower epidermis.

3. Damaged plant parts appear as white str


Brown spot

Causal organism: Helminthosporium oryzae


1. Many dark brown elliptical spots on leaves; infects coleoptiles of seedling and causes blightining; infected kernel shriveled.


1. Seed treatment before sowing with carbandazim (2.5g/kg).

2. Treatment with fungicide like mancozeb 0.25% or Adinophos 0.1%.<


Leaf Roller


Local name :

Nature and symptoms for damage of leaf folder:

1. Larvae infest the young leaves.

2. They feed on leaf tissue and as they become older, fold the leaf to form a tube.

3. During severe infestation, leaf margins dry completely.

Control of Leaf Folder

1. Spray ca


Sheath rot

Causal organism- Magnoporthe Salvinii


1. Disease infect rice after tillering.

2. The initial infection occurs on the stem in the leaf sheath and towards maturity penetrating in to the culm often causing lodging.

3. Below sheath small dark brown spots formed which have no shape. Because of this diseases panicle do not emerges

4. If the pani




Local name: Bhura mahu

Nature of Damage of BPH and WBPH :

1. Nymphs and adults damage the plants by sucking the sap and by plugging xylem and phloem with their feeding.

2. Sheath and pieces of tissues are pushed into these vessels during exploratory feeding and affects early stage of plant growt


Bacterial leaf blight (BLB)

Symptom of Bacterial leaf blight

1. ‘Kresk’ occurs in early stage (plant withers and dries up), in later stage blightining starts from the tip of the leaves to the base, straw turned yellow, partially filled grains.


1. Use balanced fertilizer dose.

2. Drain out excess of water.

3. Use resistant varities like


Whorl maggot

 Nature of Damage of Whorl maggot :

1. Yellow spots, transparent streaks and pin holes are the other symptoms found on leaves. Neonate maggots feed on the unopened central leaves.

2. Under severe infestation many broken or bent leaves willappear resulting in poor growth and reduced tillering.

Management of Whorl maggot:

• Application of carbofuron granules in the nursery 5-7 days before pulling of seedlings will protect


Rice Stem Borer


Local name: Tanachedak  

Nature of Damage of Stem Borer :

1. Caterpillars bore into stem and feed internally causing death of central shoot"dead hearts" in vegetative stage and "white earhead" at milky stage respectively.

2. The larvae of the borers enter the tiller,

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