Top borer: Scirpophaga excerptalis (Pyralidae: Lepidoptera) || KHETI KA HISAB ||

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Top borer: Scirpophaga excerptalis (Pyralidae: Lepidoptera)


Distribution and status: Formosa, Japan, the Philippines, Thailand, Bangladesh, Indonesia, Laos, Cambodia, Vietnam, Burma, and Taiwan are among the countries that make up Asia.

Host range: the grasses millets and other

Damage Symptoms     

Dead hearts in mature canes that are difficult to pull apart, dead hearts that are a reddish brown colour, parallel rows of shot holes in the emerging leaves, red tunnels in the midribs of the leaves, and bunchy tops caused by the development of side shoots. The larva mines its way to the base by boring through the midrib of unfurled leaves.

Bionomics
            Larva: White or cream in colour, smooth, with a red middorsal line and a yellow head. White-colored moth adult (with a buff coloured anal tuft in the abdominal tip of female).

Management

1.         Grow the following resistant strains: Co 724, CoJ 67, Co 1158, and Co 1111.

2.         Gather and eliminate the egg masses.

3.        Release biocontrol agents such as Isotima javensis (ichneumonid parasitoid) at 100 pairs per hectare (prepupal parasitoid); Telenomus beneficiens, Tetrastichus schoenobi, Trichogramma chilonis; Goniozus indicus, Chelonus sp., and Tetrastichus ayyari (egg parasitoids); and

4.         Spray 1000 L of water with 18.5 SC of chlorantraniprole per hectare.

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