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Stone weevil (Sternochetus mangiferae)

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The mango stone weevil (Sternochetus mangiferae) is an important monophagous pest of mango, infesting the seed (stone) within. Female lays eggs of the mango stone weevil on the epicarp of partially developed fruits or under the rind of ripening fruits. Newly emerged grubs bore through the pulp, feed on seed coat and later cause damage to cotyledons. Pupation takes place inside the seed. Discolouration of the pulp adjacent to the affected portion has been observed.

Eggs are minute and white in colour. Adult weevils are 5 to 8 mm long, stout and dark brown in colour. Life-cycle is completed in 40 to 50 days during June-July. Adults hibernate until the next fruiting season. There is only one generation in a year.

Control:

  • Destroying the affected fruits and exposing the hibernating weevils by digging the soil.
  • Spraying the trees with Fenthion (0.01%).