Sunday, July 5, 2015

Important Pests of Paddy ( Rice ) 1

Nursery Pests

Thrips: Stenchaetothrips biformis
  Symptoms of damage
Laceration of the tender leaves and sucks the plant sap
Yellow (or) silvery streaks on the leaves of young seedlings
Terminal rolling and drying of leaves from tip to base
It causes damage both in nursery and main field
 Identification of insect pest 
Adults - are dark brown in color
Control:         
Spray  Panchkavya 
 
Green leaf hopper, Nephotettix virescens,
 Symptom
Yellowing of leaves from tip to downwards.
Vector for the diseases viz., Rice tungro virus, rice yellow & transitory yellowing
 Identification of insect pest
Adults - are green with black spot and black patch on wings.
Control:
Use resistant varieties.
Apply neem cake @ 12.5 kg/20 cent nursery as basal dose
The vegetation on the bunds should also be sprayed with the insecticides
Set up light traps  , Spray Bhrama Astra
Rice case worm, Nymphula depunctalis
Symptom of damage
Caterpillars feed on green tissues of the leaves and leave become whitish papery
Tubular cases around the tillers by cutting the apical portion of leaves
Floating of tubular cases on the water
 Identification of insect pest
Larva - Pale translucent green with orange head.
It has filamentous gills on the sides of the body
Adult:  Moth is delicate white moth with pale brown wavy markings
Control:                            
  Drain the water
  Dislodge the cases – running rope
  Nursery - Mix 100 ml kerosene in standing water
  Spray Neem Astra, Agniastra

Paddy stemborer: Scirpophaga incertulas
Symptom of damage
Presence of brown colored egg mass near leaf tip.
Caterpillar bore into central shoot of paddy seedling and tiller
Causes drying of the central shoot known as “dead heart”
Grown up plant whole panicle becomes dried “white ear”.
Identification of insect pest
Egg - Laid in a mass and covered with buff coloured hairs.
Larva - Pale yellow with dark brown head.
Pupa - White silken cocoon.
Adult
Female moth - bright yellowish brown fore wings with a black spot possess a tuft of yellow hairs.
Male moth - Smaller with pale yellow forewings without black spot.
 Control:
Resistant varieties: Ratna, Jaya, TKM 6.
Avoid close planting and continuous water stagnation
Pull out and destroy the affected tillers
Set up light traps to attract and kill the moths
Harvest the crop up-to the ground level and disturb the stubble
Release the egg parasitoid, Trichogramma japonicum on twice @ 5  cc/ha/
Apply Bacillus thuringiensis var kurstaki and neem seed kernel extract
Spray ginger garlic extracts
Swarming caterpillar, Spodoptera mauritia
 Symptom of damage
Larvae cut the seedlings in large scale
Severe infestation - cattle grazing appearance to the field.
They feed gregariously and march from field to field.
Identification of insect pest
Egg - Laid in masses on leaves and covered with grey hairs
Larva - Caterpillar is cylindrical dark to pale green with lateral lines along the body
Pupa - Pupates in an earthen cocoon in soil
Adult - Moth is medium sized stoutly build.
Dark brown with a conspicuous triangular spot on fore wings.
Control:
  Kerosene the water while irrigation – suffocation
Allow ducks into the field   
Nursery
Drain the water
Spray Neemastra

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