TINGKAT KERUSAKAN DAN PADAT POPULASI HAMA Sexava coriacea L. PADA TANAMAN KELAPA DI DESA TONGUTESUNGI KECAMATAN IBU KABUPATEN HALMAHERA BARAT

Abstract

ABSTRACT

Sexava coriacea L. is a major endemic pest that attacks the leaves of coconut trees in West
Halmahera district and can cause damage so that plants cannot produce fruit and can cause plant
death if severe attacks. This study aims to determine the level of damage and population density of
S. coriacea pests in coconut plantations in Tongutesungi Village, Ibu District, West Halmahera
Regency. The research was carried out in the coconut plantation area of Tongutesungi Village, Ibu
District, West Halmahera Regency. Observation of the level of damage to S. coriacea was obtained
by taking five affected leaf sheaths by cutting them to drop them on the ground, then observing the
damage to coconut leaves. The number of fronds observed was 5 times 20 sample plants per 100
fronds, so that the total observed fronds were 100 times 5 observation points, namely 500 fronds.
Observation of population density of S. coriacea per sample tree was determined by directly
counting the number of insects both nymphs and imago found in coconut leaf midribs. Observation
of population density was 4 fronds x 20 sample trees multiplied by 5 points. The observation area
was 400 fronds. The population density of S. coriacea was determined by obtaining the average
value of all observational data. The results of the study on the level of damage to the sampling
leaves of coconut trees attacked by S. coriacea were 65.07% - 67.32% (> 50-75%) and very heavy
79.19% - 81.21% (> 75-100) the average level of damage reached 65.07% - 81.21% or the average
level of damage from all observation locations was 74.71%. The population density of S. coriacea
midrib at all observation locations ranged from 1.87- 3.01 individuls/midrib with an average
population density of 2.45 individuals/midrib.
Keywords : Sexava coriacea L., Cococ nucifera L., degree of damage, population density