White grub (Brahmina coriacea, Holotrichia longipennis, Melolontha sp., Lachnosterna longipennis and L. coracea)

Symptoms

• Initially, the grubs feed on rootlets and roots before moving on to tubers.
• The first-stage grubs consume live roots, while the second and third instar grubs create large, shallow, circular holes in the tuber.
• White grubs feed concealed, they often go unnoticed, and at harvest, a significant number of tubers are found to be infested or damaged.

Management

• Collection and destruction of grubs while ploughing.
• Flooding of the fields, for 7-10 days
• Apply well rotten FYM helps in controlling the pest.
• Seed potatoes should be planted little deep (8-10 cm) instead of normal depth (6 cm).
• Potato crop should be harvested immediately after required maturity i.e. by September.
• Apply neem cake in the field.

Chemical Control

Extremely Toxic

Highly Toxic

Moderately Toxic

Slightly Toxic