2.2 Experimental Set-up
This study was designed using Randomized Block
Design (RBD) with two factors. The first factor is
the trap model (P), with two treatment levels; a box
trap without hole at the top of the trap (P
1
) and a
modified box trap with 5 holes in the top of the trap
(P
2)
. The second factor is plant-based attractants (A).
With five levels of treatment namely; without
attractant (A
0
), pineapple pulp (A
1
), pineapple peel
(A
2
), jackfruit pulp (A
3
), and jackfruit leather (A
4
),
so that the treatment obtained by 10 combinations.
The study was conducted in three replications, so
that 30 treatments were obtained.
2.3 Implementation of Research
2.3.1 Trap Preparation
Thick bamboo cut along 50 cm split into 6 parts with
a machete. It takes as many as 14 bamboo blades to
create one square trap, and two of them are ± 75 cm
long. The bamboo blades are attached to the nails so
that they are square. Furthermore from the outside of
the trap box is covered with gauze with 10 cm from
the bottom/foot trap as the entry point of target
insects (Dedek Haryadi, 2018, personal
communication). As for the trap modification, at the
top of the trap made 4 cms diameter as much as five
holes, as well as insect entry (Figure 1).
Figure 1: Traps using plant-based attractants; A. The basic
trap model; B. Modified trap model (top view). Caption; a.
Trap length, 50 cm; b. High trap, 40 cm; c. Trap width, 50
cm; d. Foot height, 10 cm; e. Length of rope for binding
and hanging attractant, 35 cm; f. Attractant hung on plastic
ropes; g. The trap surface area covered with gauze; h. The
depth of the soil scraped to put detergent water as an
insect trapper, 5 cm; i. Place detergent water laid; j.
Absorption diameter at the top of the modified trap, 4 cm
2.3.2 Sampling Method
The traps placed on each block of oil palm for each
treatment, where the block is repeated. The traps in
each test is 10 pieces. Distance between traps 100 m.
The location of 10 traps is randomized for each
repeat on the block. Plastic transparent measuring 60
x 60 cm placed on the ground surface in a pile that
had previously been scraped as deep as ± 5 cm. Then
inserted detergent that had been diluted with water
onto the plastic until flooded. Then place the trap
above it, and on the inside of the trap is hung fruit as
the attractant in accordance with the treatment using
a plastic strap along ± 35 cm. The four types of
plant-based attractants in this study were inserted
into the gauze to prevent the attractant from falling
into the trap water detergent. There is no reference
library to determine how much the use of
attractiveness is appropriate to be used as
attractiveness. So in this study, used plant-based
attractant as much as 200 g for each treatment to
create uniformity. Insect sampling was performed 24
times with time interval sampling is daily (six days
in a week) for four weeks. Insect loading is carried
out using tweezers and inserted into a sample bottle
which has been filled with 70% alcohol, and then
covered with plastic wrap. The sample bottle is
labeled according to the treatment and date of the
data retrieval.
2.3.3 Turns The Attractant
Fruits are replaced every seventh day during insect
sampling, it was four times. Fruit turnover at 17.00
wib afternoon. The next day the trapped insects were
taken to count the number of insects of the trapped
lepidopteran, and so on until the 24th insect
sampling.
2.4 Data Analysis
All insects Lepidopteran trapped were counted on
each type of trap. Then analyzed using Analysis of
Variance (ANOVA) to compare the number of
herbivorous cluster population from Lepidoptera
which attracted to trap, attractant and interaction of
both.