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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/
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.
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.
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
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
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.
11
Jul

Biology of Rice stem borer ( Tana bedhak )

1. Egg 2. Larva 3. Pupa 4. Adult
11
Jul

Nature of damage of Rice stem borer ( Tana bedhak )

1. The insect may start attacking the plants in the nursery especially long duration varieties. 2. The incidence is mild in the season June to September, but later on gets intensified from October to January and February. 3. The caterpillar enters the stem and feeds on the growing shoot. As a result the central shoot dries up and produces the characteris
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.
11
Jul

Rice stem borer ( Tana bedhak )

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