Rice insect pest

Rice is the main stable food in Bangladesh.Rice insect pest is one of the main causes of low yield in Bangladesh.There are 175 insect pest has been identified ,among them 23 species are major.Yield loss due to rice pest.   

Aus - 24%

aman-12%

boro-18%

average-18%

Pest name:Yellow stem borer          

YELLOW STEM BORER

Scientific name:Scirpophaga incertulas (Walker)  

Symptom:

1. eggs bare or covered with hairs, laid in masses
2. neonate larvae suspend themselves from leaves by silken threads and blown to other plants to feed
3. mature larvae bore into the sheath and tiller of the plant 
4. presence of frass or fecal matter

WHITE HEAD

Effects on plant : 1.fed-upon tillers

                          2.causes deadheart or drying of the central tiller during the vegetative stage

                           3.causes whiteheads at reproductive stage

Pest name:Rice hispa

Rice hispa

Scientific name: Dicladispa armigera (Olivier)

Symptom:

1. Scraping of the upper surface of the leaf blade leaving only the lower epidermis as white streaks parallel to the midrib
2. Tunneling of larvae through leaf tissue causes irregular translucent white patches that are parallel to the leaf veins
3. Damaged leaves wither off
4. Damaged leaves turn whitish and membranous
5. Rice field appears burnt when severely infested

Damaged leaf

Pest name:Rice thrips

Rice thrips

Scientific name: Stenchaetothrips biformis (Bagnall) 

 Symptom:

1.Leaves damaged have silvery streaks or yellowish patches 2.Translucent epidermis becomes visible on damaged area

3.Leaves curled from the margin to the middle

4.Leaf tips wither off when severely infested

5.Unfilled grains at panicle stage 

lesf damage

Pest name: Green leafhopper (GLH)

Scientific name:             

Green leaf hopper

Nephotettix virescens (Distant)                      
Nephotettix nigropictus (Stal)
Nephotettix malayanus Ishihara et Kawase
Nephotettix cincticeps (Uhler)

 Symptom:

1.  Transmits virus diseases such as tungro, yellow dwarf, yellow-orange leaf, and transitory yellowing

2.Plant stunted and reduced vigor

3.Number of productive tillers reduced

4.Withering or complete plant drying

Damaged by green lesf hopper

                            

Pest name:Grasshopper

grass hopper

Scientific name: Oxya hyla intricata (Stal), 

Symptom:

1.Feeding marks on leaves and shoots

2.Large portions of leaf edges consumed

3.Panicles cut-off

Leaf damage due to grasshopper

ricebug

Pest name:  Rice bug                               

Scientific name:

Leptocorisa oratorius (Fabricius), L. chinensis (Dallas)

Symptom:

Small or shrivelled grains

Deformed or spotty grains

• Empty grains
• Erect panicles
  
  
  

  

  Grain damage due to rice bug

  
  
  

gall midge

Pest name: Asian rice gall midge    


Scientific name: Orseolia oryzae (Wood-Mason)

Symptom:

Formation of a hollow cavity or tubular gall at the base of the infested tiller

Gall is a silvery white hollow tube, 1 cm wide and 10-30 cm long 

Affected tiller inhibits growth of leaves and fails to produce panicles 

Deformed, wilted, and rolled leaf 

Elongation of leaf sheaths called onion leaf or silvershoot 

Plant stunting

damage by gall midge

Pest name:Mealy bug

Mealy bug

Scientific name:Brevennia rehi (Lindinger) 

Symptom:

Wilting
Plant stunting 

Yellowish curled leaves 

Damaged spots or chakdhora or soorai disease 

Not uniform pattern of damage

Mealy bug attack

Pest name:Rice caseworm, case bearer

asult case worm

                                              


Scientific name: Nymphula depunctalis (Guenee) 

Symptom:

Leaf cases floating on water

Leaves cut at right angles as with a pair of scissors 

Leaves with papery upper epidermis that were fed on 

Skeletonized leaf tissues usually appear ladder-like