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Pests

Pests
12
Jul

Rice leaf folder ( Patti lapetak)

Latin name: Cnaphalocrocis medinalis,
Pyralidae,
Lepidoptera
Common name: Patti lapetak
Species: C. medinalis

File Courtesy: 
BAU Ranchi
Photo Courtesy: 
CRRI
12
Jul

Management of Rice swarming caterpillar

Chemical control: Spraying of Super D (Chlorphyriphos 50% + Cypermethryn 5%) or Nural D 55 EC @ 1.25 liter in 500 liter water for 1 ha give positive results.

File Courtesy: 
BAU Ranchi
12
Jul

Biology of Rice swarming caterpillar

File Courtesy: 
BAU Ranchi
Photo Courtesy: 
BAU Ranchi
12
Jul

Nature of damage of Rice swarming caterpillar

1. Caterpillars march in large numbers in the evening hours and feed on the leaves of paddy seedlings till the morning and hide during daytime.

2. They feed gregariously and after feeding the plants in one field march onto the next field. Under severe infestation crop gives the appearance of grazed plants.

3. Attacked plants are reduced to stumps. Nurseries situated in ill-drained marshy areas attacked are earlier than dry ground. Damage is severe during July to September.

File Courtesy: 
BAU Ranchi
12
Jul

Symptom of attack of Rice swarming caterpillar

Nurseries found completely eaten away by the caterpillars’ overnight.

File Courtesy: 
BAU Ranchi
12
Jul

Rice swarming caterpillar

Latin name: Spodoptera mauritia,
Noctuidae,
Lepidoptera
Common name:
Species: S. mauritia

File Courtesy: 
BAU Ranchi
Photo Courtesy: 
CRRI
12
Jul

Management Rice Gall midge ( Sanrhakeet )

Chemical control: Carbofuran 3G @ 30 kg/ha is found to be highly effective in controlling the insect populations.
Resistant variety: Lalat and Naveen are found to be resistant to this insect in Jharkhand state.

File Courtesy: 
BAU Ranchi
11
Jul

Biology Rice Gall midge ( Sanrhakeet )

Egg: The fly lays elongate, cylindrical, shinning white or red or pinkish eggs singly or in clusters (2-6) at the base of the leaves. Maggot: Maggot is 1 mm long after hatching with pointed anterior end. It creeps down the sheath and enters the growing bud. An oval chamber is formed round the site of feeding. Pupa: At the time of emergence the pupa wriggles up the tube with the help of antennal horn to the tip of the silver shoot and projects half way out. Adult: The adult fly is yellowish brown and mosquito like. The male is ash grey in colour. Adults feed on dewdrops .

File Courtesy: 
BAU Ranchi
11
Jul

Nature of damage Rice Gall midge ( Sanrhakeet )

1. The maggot bores into the growing point of the tiller and causes abnormal growth of the leaf sheath, which becomes whitish tubular and ends bluntly.

2. It may be pale green, pink or purplish. Further growth of tiller is arrested. This is called onion shoot or silver shoot.

3. The feeding by the maggot and the larval secretion, which contains an active substance called cecidogen, is responsible for cell proliferation of the meristematic cells and gall formation.

4. It is a pest in irrigated and wet season crop. Tillers in 35 to 53 days old crops are preferred.

File Courtesy: 
BAU Ranchi
11
Jul

Symptom of attack Rice Gall midge ( Sanrhakeet )

1. The central shoot instead of producing leaf produces a long tubular structure.

2. When the gall elongates as an external symptom of damage, the insect will be in pupal stage and ready for emergence

File Courtesy: 
BAU Ranchi
Photo Courtesy: 
Mr.Kondala Rao (DRR)
11
Jul

Management of Rice stem borer ( Tana bedhak )

1. In Nursery: In 10 - 12 days nursery plant, apply Carbofuran 3G @ 250 gm, or Forate 10G @100 gm per 100 m2 nursery area.

2. Roughing: Tillers showing dead hearts should be removed and their destruction must be outside the field, it reduces the infestation.

3. Biological control: Use 8 Trichochord (Bio-agent Trichogramma) three times (total 24 in numbers), at one week interval just after one month of transplanting for one hectare.

4. Chemical control: Cartop Hydrochloride 4G @ 20 kg/ha is found to be highly effective in controlling the insect populations.

File Courtesy: 
BAU Ranchi
11
Jul

Adult of Rice stem borer ( Tana bedhak )

1. They exhibit remarkable sexual dimorphism. The female moth is bright yellowish brown with a black spot at the centre of the forewing and a tuft of yellow hairs at the anal region. The male is small in size and brownish.

File Courtesy: 
BAU Ranchi
11
Jul

Pupa of Rice stem borer ( Tana bedhak )

1. Pupation takes place inside the rice stem, straw or stubble. Before pupation it make a exit hole in the internode and covers it will a thin web for the adult to come out later.
2. The anterior extremity of the cocoon is tubular and attached to the exit hole and to make the cocoon waterproof the larva webs two horizontal septa in this tubular area.

File Courtesy: 
BAU Ranchi
11
Jul

Larva of Rice stem borer ( Tana bedhak )

1. The hatched larvae move downward and wander about on the plant for 1 or 2 hours. They may hang down by a sliver thread and get to other plants with the help of the wind.
2. They can also swim over the water and reach other tillers. They enter the leaf sheath and feed upon the green tissues of the stem for 2-3 days.
3. Then they bore into the stem near the node. Deposition of silica in the epidermal layer of the stem and leaf sheath acts as an obstacle to the first instar larvae to chew up a hole.

File Courtesy: 
BAU Ranchi
11
Jul

Larva of Rice stem borer ( Tana bedhak )

1. The hatched larvae move downward and wander about on the plant for 1 or 2 hours. They may hang down by a sliver thread and get to other plants with the help of the wind.
2. They can also swim over the water and reach other tillers. They enter the leaf sheath and feed upon the green tissues of the stem for 2-3 days.
3. Then they bore into the stem near the node. Deposition of silica in the epidermal layer of the stem and leaf sheath acts as an obstacle to the first instar larvae to chew up a hole.

File Courtesy: 
BAU Ranchi
11
Jul

Egg of Rice stem borer ( Tana bedhak )

1. Eggs are creamy white, flattened, oval and scale like and laid in mass. Each egg mass consists of 15-80 eggs and covered with buff coloured hairs.

2. Before hatching, the eggs darken to a purplish tinge. They are laid mostly near the tip of the leaves.

File Courtesy: 
BAU Ranchi
11
Jul

Biology of Rice stem borer ( Tana bedhak )

1. Egg
2. Larva
3. Pupa
4. Adult

File Courtesy: 
BAU Ranchi
11
Jul

Nature of damage of Rice stem borer ( Tana bedhak )

File Courtesy: 
BAU Ranchi
Photo Courtesy: 
CRRI
11
Jul

Symptoms of attack of Rice stem borer ( Tana bedhak )

 

A number of stem borer moths seen dead and floating on the water in the fields. In the vegetative stage, dead hearts seen in the affected tillers and in the reproductive stage, whiteear may be seen.

File Courtesy: 
BAU Ranchi
Photo Courtesy: 
CRRI
11
Jul

Rice stem borer ( Tana bedhak )

Latin name: Scirpophaga incertulas, Pyraustidae, Lepidoptera Common name: Tana bedhak Species: S. incertulas

File Courtesy: 
BAU Ranchi
Photo Courtesy: 
Mr.Kondala Rao (DRR)
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