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:
- eggs bare or covered with hairs, laid in masses
- neonate larvae suspend themselves from leaves by silken threads and blown to other plants to feed
- mature larvae bore into the sheath and tiller of the plant
- 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:
- Scraping of the upper surface of the leaf blade leaving only the lower epidermis as white streaks parallel to the midrib
- Tunneling of larvae through leaf tissue causes irregular translucent white patches that are parallel to the leaf veins
- Damaged leaves wither off
- Damaged leaves turn whitish and membranous
- 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
Pest name: Green leafhopper (GLH)
Scientific name:
Green leaf hopper |
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 |
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:
Symptom:
Small or shrivelled grains
Deformed or spotty grains
-
Empty grains
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 |
Symptom:
Wilting
Plant stunting
Plant stunting
Yellowish curled leaves
Damaged spots or chakdhora or soorai disease
Not uniform pattern of damage