VIII. coconut
-
Host Range: Pineapple, sugarcane, arecanut, sago,
oilpalm, palmyra, date palm and wild dates.
-
Egg: Female lays oval creamy white egg in manure pits or
decaying vegetable matter at a depth of 5 to 15 cm upto 140 eggs. EP: 8-18
days.
-
Grub: Grub is stout, sluggish and white with pale brown
head and found at a depth of 5 to 30 cm.
Grubs feed on the decaying again matter and grub stage lasts for 99 to
182 days.
-
Pupa: Grub pupates in earthern cells at adepth of 0.3 to 1
m and emerges as adults in 10-25 days.
-
Adult:Adult
beetle is stout, black and has a long horn projecting dorsally from the head in
male. Horn is short in female.
- Central spindle appears cut or toppled; fully opened
fronds showing characteristic diamond shaped cuttings. Holes with chewed fibre
sticking out at the base of central spindle.
Grub
Pupa
Adult
Hole on Petiole
"V" Shape cut on Frond
2. Red palm weevil:Rhynchophorus ferrugineus: Curculionidae: Coleoptera.
- Eggs are oval and white. EP: 2 to 5 days. Fecundity is 276.
- Grub: Apodous light yellowish grub with a red head becomes
full grown in 36-78 days and pupates in a fibrous cocoon inside the trunk
itself. Pupal period: 12-33 days.
- Adult: Reddish brown weevil has six dark spots on thorax. Male: Conspicuous long shout has a
tuft of hairs.
- Presence
of holes,oozing out of viscous brown fluid, extrusion of chewed up fibres
through the holes, longitudinal splitting of leaf bases and withering of the
central spindle.
Grub
Oozing out of Brown Viscous fluid
Adult weevil
Withering of Central spindle
- Host Range: Pineapple, sugarcane, arecanut, sago, oilpalm, palmyra, date palm and wild dates.
- Egg: Female lays oval creamy white egg in manure pits or decaying vegetable matter at a depth of 5 to 15 cm upto 140 eggs. EP: 8-18 days.
- Grub: Grub is stout, sluggish and white with pale brown head and found at a depth of 5 to 30 cm. Grubs feed on the decaying again matter and grub stage lasts for 99 to 182 days.
- Pupa: Grub pupates in earthern cells at adepth of 0.3 to 1 m and emerges as adults in 10-25 days.
- Adult:Adult beetle is stout, black and has a long horn projecting dorsally from the head in male. Horn is short in female.
- Central spindle appears cut or toppled; fully opened fronds showing characteristic diamond shaped cuttings. Holes with chewed fibre sticking out at the base of central spindle.
 |
| Grub |
 |
| Pupa |
 |
| Adult |
 |
| Hole on Petiole |
 |
| "V" Shape cut on Frond |
2. Red palm weevil:Rhynchophorus ferrugineus: Curculionidae: Coleoptera.
- Eggs are oval and white. EP: 2 to 5 days. Fecundity is 276.
- Grub: Apodous light yellowish grub with a red head becomes full grown in 36-78 days and pupates in a fibrous cocoon inside the trunk itself. Pupal period: 12-33 days.
- Adult: Reddish brown weevil has six dark spots on thorax. Male: Conspicuous long shout has a tuft of hairs.
- Presence of holes,oozing out of viscous brown fluid, extrusion of chewed up fibres through the holes, longitudinal splitting of leaf bases and withering of the central spindle.
 |
| Grub |
 |
| Oozing out of Brown Viscous fluid |
 |
| Adult weevil |
 |
| Withering of Central spindle |
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