Apple stem borer (Apriona cinera, Crembycidae, coleopteran)

Damaging stage: Grub

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

Identification

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

Life cycle

Egg —7-14 days–> grub –1-2 year–> Pupa –1-2 month –> Adult

Management

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