LEAF
EATING CATERPILLARS (LEC) - OCCASIONAL PESTS OF OIL PALM
CLASSIFICATION OF PESTS
ŸOCCASIONAL
PEST:
§NORMALLY UNDER NATURAL
CONTROL DUE TO PRESENCE OF EFFECTIVE NATURAL ENEMIES.
§MINIMUM TO NO ECONOMIC DAMAGE AND CROP LOSSES
§SOMETIMES OUTBREAK OCCURS DUE TO ABSENCE OR FAILURE OF
NATURAL CONTROL LEADING TO RAPID BUILD UP OF PEST POPULATION CAUSING SERIOUS
DAMAGE
§REQUIRE PLANTER'S ACTION TO REDUCE PEST POPULATION TO NATURAL
EQUILIBRIUM & RESTORE NATURAL CONTROL
§E.G. BAGWORMS,
NETTLE CATERPILLARS
Mahasena corbetti
ŸLarval cases up to 10 cm long with large pieces of leaves attached.
ŸCocoon attached directly to leaf, not very distinct from larva
ŸLife cycle about 3.5 - 4 months
ŸAverage egg per female = 3,000 plus
Metisa plana
ŸLarval cases up to 2.5 cm long with small
pieces of leaves attached
ŸCocoon attached to leaf by crook shaped
connection
ŸLife cycle about 3 months
ŸAverage egg per female = 100-300
Pteroma pendula
Cremastopsyche pendula
ŸLarval cases up to 1- 1.5 cm long
Ÿ Cocoon hang on a thread 1.5 - 5 cm long
Ÿ Life cycle about 3 months
Ÿ Average egg per female = 65 - 220
Leaf Eating Caterpillar Control
Mature plantings
ŸCROP
LOSS
§severe defoliation
§reduce FFB yield by 40 - 50 % in first year after damage
§reduce FFB yield by 20 - 30 % in second year after damage
average yield decrease
over 2 years = 30 - 40 %.
Leaf Eating Caterpillar Control
Immature plantings
ŸCROP LOSS
§ severe defoliation
§ retard growth and delay maturity
§ lower yield at early harvesting
BIOLOGICAL CONTROL
ŸSPRAY BIOPESTICIDES
§Bacillus thuringiensis
§Baculovirus
ŸPLANTING OF BENEFICAIL PLANTS
§Euphorbia heterophylla
§Cassia cobanensis
§Turnera
§Antigonon
CHEMICAL CONTROL
ŸSPRAYING
§GROUND SPRAYING
ŸTRACTOR MOUNTED SPRAYER
ŸCYPERMETHRIN AT 22.5 G / HA OR 5% PRODUCT AT 450 ML / HA
ŸSPRAY VOLUME - CALIBRATION ŸSPRAYING
§GROUND SPRAYING
ŸTRACTOR MOUNTED SPRAYER
ŸCYPERMETHRIN AT 22.5 G / HA OR 5% PRODUCT AT 450 ML / HA
ŸSPRAY VOLUME - CALIBRATION
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