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Pests

Pests
3
Aug

Root aphids

File Courtesy: 
ICAR NEH, Umiam
Photo Courtesy: 
CRRI
3
Aug

Gundhi bug

1. Gundhibug (Leptocorisa oratorious) is the most serious pests of rice under upland and lowland conditions.
2. Both nymphs and adults suck the sap from the developing grains, which results chaffy grains.
3. Nymphs are more destructive than adults. These bugs cause Yield losses up to 20-40%.

File Courtesy: 
ICAR NEH, Umiam
Photo Courtesy: 
CRRI
3
Aug

Rice green semilooper

1. Rice green semilooper (Naranga aenescens) is one of the major pests of rice.
2. It infests 30-40 days old upland crop and continues to Damage the crop up to 65 days. The larvae feed mainly on leaves and defoliate them.
3. Apanteles sp. parasitize up to 80% of green semilooper in field conditions.

File Courtesy: 
ICAR NEH, Umiam
Photo Courtesy: 
IRRI
3
Aug

Rice ear cutting caterpillar

1. The outbreak of rice ear cutting caterpillar (Mythimna separata) was recorded during 1982 initially in Assam and then spread to Manipur, Arunachal, Meghalaya and Tripura.
2. It is an important pest of rice in the region. During outbreaks, it causes 100% damage to the standing crop•
3. The larvae cut the ear head and leave behind the rice shoot resulting in as if the animals have grazed it. It directly affects the yield of the crop.

File Courtesy: 
ICAR NEH, Umiam
3
Aug

Rice hispa

File Courtesy: 
ICAR NEH, Umiam
Photo Courtesy: 
CRRI
3
Aug

Rice gall midge

File Courtesy: 
ICAR NEH, Umiam
Photo Courtesy: 
CRRI
3
Aug

Rice thrips

1. Both nymphs and adults of thrips (Thrips oryzae) feed on the plant sap from tender leaves. 2. The leaf tips of the affected plants fade and roll up and the thrips remain within the folds. 3. This is a serious pest in uplands of Sikkim andjhum lands ofTripura, Mizoram, Meghalaya, Manipur and Arunachal Pradesh.

File Courtesy: 
ICAR NEH, Umiam
Photo Courtesy: 
CRRI
3
Aug

Rice armyworm

1. Army worm (Spodoptera mauritia) is a sporadic pest on rice and severely occurs in Umraiang valley of Jowai district in Meghalaya, valley land of Manipur and Tripura. 2. Caterpillars feed on leaves and in severe infestation entire seedbeds and fields are destroyed and the fields appear as if it has been grazed by animals/cattle. 3. The larvae feed voraciously in the night and hide in the cracks and crevices of the soil during daytime.

File Courtesy: 
ICAR NEH, Umiam
3
Aug

Rice caseworm

1. Case worm (Nymphula depunctalis) is one of the serious pests in many areas of the NE region. 2. Adults of case worm are 6 mm long with wingspan of 15 mm. Slender green coloured caterpillars cut leaf blades into length of about 1.25 cm out of which they make tubular cases with which they feed and float while moving plant to plant. During heavy damage, leaves are skeletonised and appear whitish in colour.

File Courtesy: 
ICAR NEH, Umiam
Photo Courtesy: 
CRRI
3
Aug

Rice leaf roller

File Courtesy: 
ICAR NEH, Umiam
Photo Courtesy: 
CRRI
3
Aug

Rice Stem borer

File Courtesy: 
ICAR NEH, Umiam
Photo Courtesy: 
CRRI
3
Aug

Important Pests of assam

The economically important insects causing considerable damage to rice crop in this region are
1. Stem borer
2. Leafroller
3. Caseworm
4. Armyworm
5. Thrips
6. GalI midge
7. Rice hispa
8. Rice ear cutting caterpillar
9. Rice green semilooper
10. Gundhibug
11. Root aphids
12. Horned caterpillar
13. Skipper
14. Slug caterpillar

File Courtesy: 
ICAR NEH, Umiam
2
Aug

Leaf Folder

 

1. The larvae fold the leaves, eat out the green tissue and produce white streaks.

2. The damage is highest during August-October. Spray the crop when the leaf damage reaches 10 per cent (ETL) with 350 ml of Hostathion 40 EC (triazophos) or 1 litre of Coroban/ Durmet/ Force 20 EC (chlorpyriphos) or 560 ml of Monocil 36 SL (monocrotophos) in 100 litres of water per acre.

File Courtesy: 
Punjab Agricultural University, Ludhiana
Photo Courtesy: 
Mr. Y. Kondal Rao (DRR)
2
Aug

Grasshoppers

 

1. Grasshoppers can damage rice at all stages of crop growth.

2. Both nymphs and adults feed on leaves by cutting the edges of leaves at all the growth stages of the rice crop.

3. Damage is found more on the margins of the field.

4. They sometimes cut the plants similar to cut worms.

5. When the grasshoppers are in greater numbers they can even feed on the midribs and total leaves and cause extensive defoliation.

File Courtesy: 
Punjab Agricultural University, Ludhiana
Photo Courtesy: 
http://www.google.co.in/imgres
2
Aug

Grasshoppers

 

1. Grasshoppers can damage rice at all stages of crop growth.

2. Both nymphs and adults feed on leaves by cutting the edges of leaves at all the growth stages of the rice crop.

3. Damage is found more on the margins of the field.

4. They sometimes cut the plants similar to cut worms.

5. When the grasshoppers are in greater numbers they can even feed on the midribs and total leaves and cause extensive defoliation.

File Courtesy: 
Punjab Agricultural University, Ludhiana
Photo Courtesy: 
http://www.google.co.in/imgres
2
Aug

Rice-ear-cutting-caterpillar

1. The larvae of this insect are gregarious in habit and are commonly known as ‘armyworm’. The young larvae feed on leaves, leaving only the mid-ribs and stems.

2. The old larvae cut off the panicles mostly at the base and hence the name “rice ear cutting caterpillar”. This stage of the insect causes serious loss to the paddy crop.

3. The larvae are shy of sunlight and generally feed at night. The damage to paddy crop is caused mostly during September to November.

File Courtesy: 
Punjab Agricultural University, Ludhiana
2
Aug

Rice Root Weevil

1. This weevil is a localized pest in the rice area around Rajpura. However, this pest has also been observed in some other areas in the State.

2. Its white, legless grubs feed on roots in the soil from July to September. The attacked plants turn yellow, stunted and produce only a few tillers.

3. Apply one of the following granular insecticides in the standing water:- 3 kg of Thimet/Foratox 10G (phorate) per acre.

File Courtesy: 
Punjab Agricultural University, Ludhiana
2
Aug

Pest out breaks in Manipur and Meghalaya

1. Outbreak of rice ear-cutting caterpillar was recorded in Assam and Manipur (Pathak et aI., 2001), Arunachal, Meghalaya and Tripura during 1982 (Barwal, 1983).
2. During 1977, outbreak of black hairy caterpillar was recorded in Meghalaya (Sachan and Gangwar, 1979). Rice hispa outbreak was recorded in Meghalaya and Arunachal Pradesh in 1987 (Pathak, 1987).
3. During 1986 - 1990, two species of shield bug (Eusarocoris gultieger Jhunl. and Nezara viridula L.) were found to infest rice at milky soft dough and hard dough stages in Manipur (pathak et aI., 2001).

File Courtesy: 
ICAR NEH, Umiam
2
Aug

Rice Hispa

 

1. Rice hispa a serious pest in some areas of the Gurdaspur and Amritsar districts and is also found in the other rice growing areas of the state.

2. The grubs of this pest tunnel in to the leaves, whereas the adults are exposed feeders. The grubs cause damage by producing bold, white streaks on the leaves.

File Courtesy: 
Punjab Agricultural University, Ludhiana
Photo Courtesy: 
Mr. Y. Kondal Rao (DRR)
2
Aug

Rice Slug caterpillar

1. Slug caterpillar (Parasa lepida) is a sporadic pest on rice. The larvae feed on the leaves leaving only the midrib.
2. It is recorded for the first time from NE region infesting rice crop during rainy season (Shylesha et al., 2006).

3. The other insect pests of minor economic importance include flea beetles (Chaetocnema basalis and Monolepta signata), stemfly, mole and field crickets, black bug, stink bug, blue beetles and black aphids.

File Courtesy: 
ICAR NEH, Umiam
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