Damage status and some biological characteristics of Herpetogramma sp. damaging Sterrculia foetida in South central, Vietnam
Keywords:
Sterculia foetida,, black - headed leaf - forder,, biological characteristicsAbstract
This is the first record of black - headed leaf - forder Herpetogramma sp.
(Lepidoptera: Spilomelinae) damaging S. foetida plantations in South
cetral, Vietnam. The average damage incidence from 31.37% to 43.51%,
the average damage index was from 0.9 - 1.44 in under 5 years old
plantattions; The average damage incidence and damage index in over 5
years old plantations were lower, from 27.43% to 30.93% and 0.74 to 0.9,
respectively. Adults are pale yellow in color, with pale black double eyes.
The antennae are filiform in shape with 1.22 to 1.38 mm length. Above the
chest, abdomen and wings are pale yellow, the front and rear wingspan
havethree pale black lines. The eggs are oval and white when first laid.
They measure approximately 0.7 mm in lenth and 0.5 mm in wide. The
larvae included 6 age stages: The first instar larvae usually feed on young
leaves, the 3, 4, 5 instar larvae eat stronger, the final instar larvae is less
active, pre - pupa stage is white yellow, with brown - black head. Pupal are
yellow brown in color.
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