Apple stem borer (Apriona cinera, Crembycidae, coleopteran)

Damaging stage: Grub

Damaging symptoms: damage to the xylem part, breaking xylem tissue so that nutrient carrying capacity of the xylem is reduced.

Identification

• Egg: on bark in single or in a group of one or two in the bark of trunk a branches
• Grub: redhead, creamy white
• Pupa: inside the trunk.
• Adult: straw color, yellowish brown, long antennae.

Management

• Prune and burn all attacked shoots and branches during
• loose bark and dry branches from the tree
• insert long wire into the hole on the tree to kill the larva and pupa inside .
• Inject 5 ml of kerosene or petrol with cotton into the hole and close the hole with mud.
• Imidacloprid 8% sl @ 1ml/L of water, thiamethoxam 25% WG @ 1g/L of water for 5 times starting from 2^nd week of asar (July) at 15-day intervals.