Here is information about the introduction, classification, life cycle, nature of damage.managemnet of Mango nut Weevil

1. Sam Higginbottom University Of Agriculture, Sciences And
Technology
Submitted to
Submitted by
Dr Usha Yadav

2. B.SC(HONS)HORTICULTURE
Year-2nd
Semester-4th
ENT-426
Insect, pests of fruits, plantation and medicinal
crop.
Mango nut weevil
B.N :- Sternochetus mangiferoae
Order:- Beetle
Family:- Curculionidae

3. Introduction
 The mango seed weevil is one of major pests of mangoes in
East Africa.
 The larva, which is the damaging stage of the pest, enters the
fruit burrowing through the flesh into the seeds, where they
feed until pupation, destroying the seed.
 Early attack leads to premature fruit fall. If the attacks occur at
a later stage, fruit infestation is very difficult to detect, since
there are no external signs of infestation.

4. Host:- Mango
Identification:-
 Grub:- A full growth grub is legless. Fleshly and yellow with dark
head.
 Dark weevil after emergence remain inactive. Hidden in the cracks
and crevices on the trunk.
 Adult:- adult is a dark brown with short snout.

6. Life Cycle
 The egg period is 7 days.
 a single fruit up to 15 eggs may be laid in a day
 The larval period is 20-30 days. It undergoes five larval
instars and pupate inside the nut along the concave
side.
 The pupal period is 7 days
 The adult weevil is stoutly built, 6 mm long, dark brown
in colour.
 The total life cycle occupies 40-50 days.

7. .
EGG
Larvae
Grub
Adult
Total life cycle
occupies 40-50
days.

8. NOD..
 Grub makes zigzag tunnel with pulp.
 Eats unripe tissue and bore into cotyledons.
 Fruits dropping at marble stage.
 Ovipostion injuries on marble size fruit.
 Tunnel cotyledons in mature fruit by grubs.

10. Management
 Collect and destroy the fallen fruit.
 Spray application of Fenthion 100 EC 1ml/L (1st at
marble stage of the fruit 2nd at 15 days interval).
 During non flowering season direct spray towards the
base of the trunk.