Pests of Paddy.

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SUCCESSFUL MANAGEMENT OF PEST IN PADDY CULTIVATION

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Presentation transcript:

Pests of Paddy

LEAF, STEM AND SEED SUCKING INSECTS

Nephotettix spp. Homoptera:Cicadellidae Bena hijau/leafhopper Suck the leaf, stem and rice grain (biji) Pest: nymph and adult Transmits virus diseases such as tungro (N. virescens), yellow dwarf, yellow-orange leaf Simptom: leaf yellowish and dry,small grain,, sterile, plant stunted

Nephotettix virescens

Control measures: 1) dry the field after harvesting 2) destroy the remaining rice plants after harvesting( esp. those which are infected) 3)area with severe damage: use insecticide one week after seeding Racun: 0.1% carbaryl, dimethoate Biocontrol: Miridae (hemiptera), nematode parasitize nymph & adult

Nilaparvata lugens Homoptera: Delphacidae Bena perang/ brown planthopper Suck the sap of a growing padi plant( near water level) Nymphs and adults cause damage

A high density of population  HOPPERBURN crops dries up in round patches, brownish color Disease: ragged stunt, grassy stunt

draining the rice field for 3-4 days is recommended during the early stage of infestation. Nitrogen application can be split to reduce BPH buildup. Maintaining a free-rice period could also decrease the build-up of population Spray with acephate 0.1% a.i, phenthoate 0.05% a.i

Biocontrol: use of spiders (predators) eg: Lycosa pseudoannulata (20 BPH/day)

Scotinophora coarctata Hemiptera:Pentatomidae Kutu beruang/rice black bug Adult & nymph Suck sap from base of padi stem

Weakening padi, seed production decrease,, severe: padi stunted, leaves turn reddish brown Control: During early infestation, the water level in the field may be raised for 2-3 days to force the insects to move upwards. Flooding the fields can also cause higher egg mortality. After harvest, fields might be plowed to remove remaining insects

Sogatella furcifera Homoptera: Delphacidae:planthopper Adult and nymph Suck the sap from leaf blade and leaf sheath Symptom; reddich brown patches on leaf, for serious infestation you can see yellow patchesControl: drain off water 2-3 days,then flood again (same like Nilaparvata lugens)

spray gamma BHC, endosulfan, carbaryl ( all 0.1% a.i) Use Metarhizium anisopliae (fungus) foliar spraying of insecticides directed at the base of the rice plant is the most effective

PENGOREK BATANG (STEMBORER)

Scirpophaga incertulas Lepidoptera:Pyralidae Yellow stemborer The caterpillars bore into the rice stem and hollow out the stem completely the early stages of growth, drying up of young leaves or death of tillers. Attack is more common at 'bunting' stage and then the ear may not emerge and if it does ;it may be empty

Control: control measures e. g Control: control measures e.g. spraying surface of water at maximum tillering may be useful

PEMAKAN DAUN leaf eater

Spodoptera litura Lepidoptera:Noctuidae Ulat ratus/armyworm Eat leaf-blades, particularly serious in nursery and dry padi. Control: Dust 25 lb per acre of a mixture of 5% DDT dust and wood ash. 2. If possible, flood the nursery. 3. Spray with 3 pints 25% DDT emulsion in 40-80 gallons of water per acre.