This document discusses two pests that damage paddy/rice crops: the rice bug (Leptocorisa varicornis) and the brown plant hopper (Nilaparvata lugens). It provides details on the systematic classification, distribution, life cycle and damage caused by each pest. It also outlines control methods for each pest, including cultural, chemical and mechanical approaches. The goal is to educate readers on these two major rice pests and how to effectively control them to prevent crop loss.

1. INTRO
• PRESENTERS; ARSHAD KHAN
AND
TARIQ RAHIM
• TOPIC; PADDY PEST

2. CONTENTS
• SYSTEMATIC POSITION
• DISTRIBUTION
• LIFE HISTORY
• CONTROL METHOD

3. THE RICE BUG
• PHYLUM: ARTHROPODA
• CLASS: INSECTA
• ORDER: HEMIPTERA
• FAMILY: COREIDAE
• GENUS: LEPTOCORISA
• SPECIES: VARICORNIS

7. DISTRIBUTION
• Present throughout india and pakistan and
bangladish
• Commonly called Gundhi kira in india

8. Distribution in pakistan

9. NATURE OF DAMAGE
• Active insect, Long leged ,adult measures
about an inch in length
• Infect paddy plant when come to flower
• Sucking mouth parts are used to suck out milk
from grains which soon shrivel
• It caused 5 – 25% loss

10. Life history
• Female lay eggs symmetrically into 2 ,3 rows
• Eggs are dark coloured,oval and flattened at
top
• Eggs hatch in about a week
• Nymph have slender green body ,long legs
• 20 days to become adult

11. • Period is from july to november
• Winter breeding rate is lowered

12. Control
• Cultural method
• Remove the alternate food at off season
• Draining out water from infested field
for 3-4 days
• Crop rotation is advisible

13. Chemical method
• 5% BHC(benzene hexachloride) 15kg/ha
dusting is advised
• Malathion and methylparaathion dust is also
effective
• Spraying of 0.25% DDT or BHC or 0.04% endrin
atleast 2 weeks before harvesting

14. Mechanical control
• Collection of bugs with hand and destrication
is qa useful mechanical method
• BIOLOGICAL CONTROL
• Cicendalasixpunctata pentatumid prey upon
the adult of Leptocorisa

15. THANKS

16. 2.THE BROWN PLANT HOPPER
SYSTEMATIC POSITION;
• PHYLUM: ARTHROPODA
• CLASS: INSECTA
• ORDER: HEMIPTERA
• FAMILY: DELPHACIDAE
• GENUS: NILAPARVATA
• SPECIES: LUGENS

17. DISTRIBUTION
• Found where rice is found
• It is brown in colour,female is larger 4-5mm
• Female are winged

18. NATURE OF DAMAGE
• All stages of paddy are attacked by this pest
• Cluster of pest at base of plant feed on plant
sap which lead plant to turns yellow and then
dry up
• At start of this infestation round yellow
patches appears which soon turns brownish
due to drying of plant .this is called as
hopper burn.it demage crop upto 100%

19. Life history
• Copulation starts as female emerges and lay
eggs from next day
• Eggs in bunches of 3-10 are thurst within the
tissue of plant along with mid region of leaf
sheath and mid rib of leaves
• Female lay average of 200-250 eggs
• Eggs are white ,elongated.hatch about 8-10
days

20. • Nymph undergoes 5 instar within period of
15-20 days
• Life cycle is completed in 20-25 days
• Male life span is 15-20 days and female
is 15-30 days
• Optimum temperature for development is 30
and humidity is 70-90%

21. control
• Cultural method:
• Draining of water from field
• Use of resistant varieties of crop
• CHEMICAl METHOD:
• Spray of BHC,carbaryl fenthion and
quinalphos should be made as yellow
patches are seen in field