THE POPULATION STRUCTURES AND PARASITIZING LEVEL OF DIADEGMA SEMICLAUSUM HELLEN ON LARVAE OF PLUTELLA XYLOSTELLA LINN. (LEPIDOPTERA : PLUTELLIDAE) IN BALI REGION

 Ketut Ayu Yuliadhi, Trisna Agung Phabiola

Laboratory of Integrated Pest Management, Faculty of Agriculture Udayana University Jl. PB Sudirman, Denpasar-Bali. Email : ayususrusa@yahoo.co.id

RESEARCH METHOD  

CONCLUSION Vegetables such as cabbage, cauliflower, brocolli, and Chinese cabbage were identified as the host range of Plutella xylostella L. of Brassicaceae/Crucifera family). The parasitizing level of Diadegma semiclausum Hellen was recorded at its highest on brocolli (42.10%) and at its lowest on cauliflower (5.55%).

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REFERENCES Hawkins, N.C., Van Buskirk, C., Grossniklaus, U., and Schupbach, T. 1997. Post-

transcriptional regulation of gurken by encores is required for axis determination in Drosophila. Development 124(23) : 4801 – 4810.

Kalshoven LGE. 1981. The Pests of Crops in Indonesia. van der Laan PA, penerjemah. Jakarta: PT Ichtiar Baru-van Hoeve.

Yuliadhi. K.A. 2012. Tingkat Parasitisasi Parasitoid Larva, Diadegma semiclausum Hellen (Hymenoptera:Ichneumonidae) pada Plutella xylostella (Lepidoptera: Plutellidae) di Desa Candikuning Kabupaten Tabanan, Bali, Indonesia. Denpasar : Universitas Udayana.

Yuliadhi, K.A. dan Sudiarta, P. 2012. Struktur komunitas hama pemakan daun kubis dan investigasi musuh alaminya. Agritrop Vol. 2, No. 2.

Yuliadhi, K.A., IW Supartha dan TA Phabiola. 2016. Parasitism level of larval parasitoid, Cotesia plutellae kurdjumov (hymenoptera : braconidae) on Plutella xylostella (lepidoptera : plutellidae) at cauliflower.

INTRODUCTION  Diamondback moth, Plutella xylostella L. is one of the major pest species, which predate on crops, especially cabbages (Cruciferae). The pest are ussually tackled by the utilization of pesticides to keep the population below theeconomic threshold. Other alternative have also emerged as communities have increasingly considered the utilization of more ecologically sustainable pest management practices. Parasitoid is one of biological control agents that are most effective in suppressing or in controlling pest population in the field (Hawkins et al., 1997). The effectiveness of natural control in the field is influenced by the complexity of parasitoid communities in the field. The complexity of parasitoid in the field the key, which determines the parasiting level of parasitoid. Thus, it is important to understand the potential of Diadegma semiclausum Hellen as the natural enemy of Plutella xylostella L. on Cruciferae plants. .

DISCUSSION

Sampling of P. xylostella Host Plant

The survey was conducted in two districts, namely Tabanan and Badung in the province of Bali. The samples were obtained by using purposive sampling method on 100 sample plants of 3, 5, and 7 weeks of age after cultivation.

The level parasitism of parasitoids Tingkat parasitisasi dihitung menggunakan rumus modifikasi dari Buchori et al. (2010) sebagai berikut :

Vegetables such as cauliflower, brocolli, and Chinese cabbage were identified as the host range of Plutella xylostella L. of Brassicaceae/Cruciferae family) (Table 1.1). Tanaman inang ditemukan dari ketinggian tempat 640 m dpl sampai lebih dari 1000 m dpl. Masing-masing tanaman inang mempunyai kepadatan populasi P. xylostella yang berbeda-beda sesuai ketinggian tempat.

Kerapatan D. semiclausum ditemukan 16 pupa pada pertanaman brokoli dan 1 pupa pada pertanaman kol bunga di Desa Bangli-Tabanan. Pada pertanaman sawi china ditemukan 13 pupa D. semiclausum dan 16 pupa D. semiclausum pada pertanaman brokoli di Desa Candikuning-Tabanan. Sedangkan di Desa Pelaga-Badung ditemukan 5 pupa D. semiclausum (Table 1.2).

Tingkat parasitisasi D. semiclausum tertinggi 42.11% pada tanaman brokoli di Bangli-Tabanan district dengan ketinggian tempat 950-1000 m asl (Figure 1.1). Selanjutnya, masing-masing tingkat parasitisasi D. semiclausum berturut-turut 35.56% pada tanaman brokoli dengan ketinggian tempat >1000 m asl, 30.95% pada tanaman sawi china dengan ketinggian tempat >1000 m asl, 9.09% pada tanaman brokoli dengan ketinggian tempat >1000 m asl di Desa Pelaga-Badung dan 5.55% pada tanaman kol bunga dengan ketinggian tempat 950-1000 m asl di Bangli-Tabanan.

Larvae of P. xylostella

Observations in the laboratory

Pupae of D. semiclausum

Table 1. Host range of P. xylostella at different altitude

0 10 20 30 40 50 60

Num

ber o

f pop

ulat

ion

Host plants on different altitude

P. xylostella D. semiclausum

Figure1.1 The level parasitism of D. semiclausum on Cruciferae plants

Information : m asl : meters above sea level

Location/ Altitude Commodity No. of pupae No. of D. semiclausum

Baturiti-Tabanan

district (950 m asl)

Brocolli 16 16

Cauliflower 1 1

Candikuning-

Tabanan district

(>1000 m asl)

Cabbage chinese 13 13

Brocolli 16 16

Petang-Badung

district (1017 m asl) Brocolli 5 5

Location/ altitude Commodity Population no. of P. xylostella

Larvae Pupae

Marga-Tabanan

district (640 m asl) Cabbage 5 35

Baturiti-Tabanan

district (950 m asl)

Brocolli 11 27

Cauliflower 13 5

Candikuning-

Tabanan district

(>1000 m asl)

Cabbage chinese 25 17

Brocolli 14 31

Petang-Badung

district (1017 m asl) Brocolli 35 20

Table 1.2 Population Density of Diadegma semiclausum

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THE POPULATION STRUCTURES AND PARASITIZING LEVEL OF DIADEGMA SEMICLAUSUM HELLEN ON LARVAE OF PLUTELLA XYLOSTELLA LINN.

IN BALI REGION

KETUT AYU YULIADHI, TRISNA AGUNG PHABIOLA

Laboratory of Integrated Pest Management, Faculty of Agriculture Udayana University Jl. PB Sudirman, Denpasar-Bali. Email: ayususrusa@yahoo.co.id

Abstract

This study aims to identify the population structures and parasitizing level of Diadegma semiclausum Hellen on larvae of Plutella xylostella Linn. The survey was conducted in two districts, namely Tabanan and Badung in the province of Bali. The samples were obtained by using purposive sampling method on 100 sample plants of 3, 5, and 7 weeks of age after cultivation. Vegetables such as cauliflower, broccoli, and Chinese cabbage were identified as the host range of Plutella xylostella L. of Brassicaceae/Cruciferae family). The population density of Plutella xylostella L. and Diadegma semiclausum Hellen were recorded at its highest on brocolli. Population density of 16 Diadegma semiclausum was recorded in 950 m asl - 1000 m asl (Bangli and Candikuning village, Baturiti-Tabanan district ), and only 5 Diadegma semiclausum in 1017 m asl (Pelaga village, Petang- Badung district) The parasitizing level of Diadegma semiclausum Hellen was recorded at its highest on brocolli (42.10%) and at its lowest on cauliflower (5.55%).

Key words: Parasitoid, P. xylostella, D. semiclausum, and Cruciferae