rice pest and its control
Rice pest and its control
1. Rice case worm/case bearer
• Aquatic insects, pale translucent green larva with pale orange head
• Found in irrigated and wetland areas with standing water
• Larva lives in sections of leaves cut from young rice plant into tubes called cases
• The adults are nocturnal and are attracted to light traps. The larva hides in its case then float on the water surface during the day and crawls to the rice plant with its case to feed.
Damage
• Begins in a flooded seedbed, larva feed by scraping patches of green tissue from young leaves, causing white epidermis to remain.
• Ladder like appearance of removed leave tissue resulting from the back and forth motion on the head during feeding.
• Maturation may be delayed 7-10 days
Management
Cultural control
• Non-flooded seedbed
• Transplanting older seedlings
• Draining the paddy
•
Biological control
• Braconid wasp – parasitizes larva stage
• snails (feed on eggs), hydrophilid
• dytiscid water beetles (feed on larvae),
• Spiders
• dragonflies,
• birds (feed on adults),
Chemical control
• Filiar spray or granules in paddy water
Green semiloopers
• Larva moves by arching its back in the shape of a loop as the larva does not arch its back completely as true loopers. They are found in wetland environment.
Damage
• Feed on leaf blade. The young larva scrapes leaf tissue from the leave blade.
Management
Cultural control
• Use an optional amount of fertilizer
Biological control
• Trichogrammid wasp – parasitizes their eggs
• Ichneumid wasp – parasitizes the larva
• Larva are attacked by fungi
• Spider- feed on adult
Chemical control
• Foliar sprays or systemic granules.
Hydrellia philippina Ferino
Whore maggot
• The rice whorl maggot is semi-aquatic.
• It is common in irrigated fields and feeds on the central whorl leaf of the vegetative stage of the rice plant. It does not occur in upland rice
1. Rice case worm/case bearer
• Aquatic insects, pale translucent green larva with pale orange head
• Found in irrigated and wetland areas with standing water
• Larva lives in sections of leaves cut from young rice plant into tubes called cases
• The adults are nocturnal and are attracted to light traps. The larva hides in its case then float on the water surface during the day and crawls to the rice plant with its case to feed.
Damage
• Begins in a flooded seedbed, larva feed by scraping patches of green tissue from young leaves, causing white epidermis to remain.
• Ladder like appearance of removed leave tissue resulting from the back and forth motion on the head during feeding.
• Maturation may be delayed 7-10 days
Management
Cultural control
• Non-flooded seedbed
• Transplanting older seedlings
• Draining the paddy
•
Biological control
• Braconid wasp – parasitizes larva stage
• snails (feed on eggs), hydrophilid
• dytiscid water beetles (feed on larvae),
• Spiders
• dragonflies,
• birds (feed on adults),
Chemical control
• Filiar spray or granules in paddy water
Green semiloopers
• Larva moves by arching its back in the shape of a loop as the larva does not arch its back completely as true loopers. They are found in wetland environment.
Damage
• Feed on leaf blade. The young larva scrapes leaf tissue from the leave blade.
Management
Cultural control
• Use an optional amount of fertilizer
Biological control
• Trichogrammid wasp – parasitizes their eggs
• Ichneumid wasp – parasitizes the larva
• Larva are attacked by fungi
• Spider- feed on adult
Chemical control
• Foliar sprays or systemic granules.
Hydrellia philippina Ferino
Whore maggot
• The rice whorl maggot is semi-aquatic.
• It is common in irrigated fields and feeds on the central whorl leaf of the vegetative stage of the rice plant. It does not occur in upland rice