Rice Hispa and Its Control

• Hispa feed on the main host plant such as paddy, sugarcane, wheat, maize, and wild grass

Scientific Name - Dicladispa armigera  

Occurrence Stage - Seedling Stage, Vegetative Stage, Flowering Stage

Nature of Damage - The adults scrape the upper surface tissues of the leaves and the grubs (larvae) mining inside the leaves and scrape from inside.

 

Damage Symptoms

• Presence of parallel white strips on the upper surface of the leaves due to scraping of adults

• Uneven whitish and membranous patches on the leaves due to mining of grubs

• If severely occupied, scratched leaves dry up and dry patches like burnt can be seen in the rice field from far away

Best Control Measures 

• Reduce 75-92 % of the pest infestation by cutting off the leaf tips with adults and grubs

• In severe damage, catch the adults with nets and destroy them.

• Cultivate early mature varieties

• Avoid over dosage application of Nitrogen

Chemical Control 

• Pyrethroid insecticides granules and liquids can be used.

• Use neem pesticides 300 ppm and azadirachtin 1500 ppm to reduce the appetite

• Methoprene and Diflubenzuron are stunted the growth of rice hisper

• Use the following contact pesticides at recommended dosage

• Azinphos-methyl EC 0.3-0.5 Kg/ha

• Carbaryl WP-1.25-1 Kg/ha

• Cartap EC 0,8 Kg/ha

• Chlordimeform EC- 0.5-0.75 Lit

• Dichlorvos EC- 0.75-1.0 Lit/ha

• Dimethoate EC 0.5 Kg/ha 

• Malathion 0.5 Kg/ha

Economic Threshold Level

 

• 4-5 adults or 5 grubs per hill 

• 2 adults after tillering