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BIOTROPIA - The Southeast Asian Journal of Tropical Biology
Published by Southeast Asian Regional Centre for Tropical Biology
ISSN : 02156334     EISSN : 1907770X     DOI : http://dx.doi.org/10.11598/btb
Core Subject : Health, Science, Agriculture,
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Immunology & microbiology Veterinary
BIOTROPIA, The Southeast Asian Journal of Tropical Biology, is a scientific publication of the Southeast Asian Ministers of Education Organization (SEAMEO) – Southeast Asian Regional Center for Tropical Biology (BIOTROP). It publishes articles in the broad areas of tropical ecosystems and environmental impacts, biodiversity conservation and sustainable development and biotechnology.
Arjuna Subject : Ilmu Pertanian dan Biologi (Semua) - Ilmu Pertanian dan Biologi (Lain-Lain)
Articles 6 Documents
 1 
Search results for , issue "No. 4 (1991)" : 6 Documents clear
THE ROLE OF HALTICA SP. (COLEOPTERA: HALTICIDAE) AS BIOLOGICAL CONTROL AGENT OF POLYGONUM CHINENSE SUN JAY A SUN JAY A
BIOTROPIA - The Southeast Asian Journal of Tropical Biology No. 4 (1991)
Publisher : SEAMEO BIOTROP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (170.562 KB) | DOI: 10.11598/btb.1991.0.4.190

Abstract

The role of Haltica sp. (Coleoptera: Halticidae) with emphasis on host specificity and damage potential in controlling Polygonum chinense was evaluated under laboratory condition. Starvation test of the weevil on 33 weeds and 14 crop plant species indicated that only 6 weed species were attacked: Polygonum chinense, P. nepalense, P. barbatum, P. longisetum, Ludwigia octovalvis and L. parennis with P. chinense as the most preferred host plant. Preliminary damage potential test indicated that a population of 0, 1,2 and 3 pairs of adult weevil reduced the  percentage  of  fresh  weight  increment  of  P.  chinense  by    0;  46.2;  74.7  and  75.5%  respectively.  Field observations indicated that the larvae as well as adult weevils are potential biological control agents of P. chinense. Further studies are, however, on the host-range of this weevil.
STRAIN DIFFERENCES IN TWO SPECIES OF CALLOSOBRUCHUS (COLEOPTERA: BRUCHIDAE) DEVELOPING ON SEEDS OF COWPEA {VIGNA UNGUICULATA (L.)} AND GREEN GRAM {V. RADIATA (L.)} RENNIE ROESLI
BIOTROPIA - The Southeast Asian Journal of Tropical Biology No. 4 (1991)
Publisher : SEAMEO BIOTROP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (739.368 KB) | DOI: 10.11598/btb.1991.0.4.191

Abstract

Ovipositional behaviour, development period, and density effect on adult survival of C. maculatus strains from  Indonesia, Nigeria, and Yemen, and C. chinensis strains  from  Indonesia and Kenya on cowpea and green gram were studied at 20°C and 70% relative humidity. Variations on ovipositional behaviour were found among C. maculatus as well as among C. chinensis strains. Variations on developmental period were found only among C. maculatus strains. The developmental period of Callosobruchus spp. was shorter on green gram than that on cowpea. Density effect was remarkably found only on  adult survival of C. maculatus Yemen strain. These  results make  useful  contribution  to  the species  biology,  and  have  important  implication  if  strains  of  these  species  are  accidentally  imported  to countries, or when new legume crops are introduced.
SOIL AS A FACTOR INFLUENCING THE MANGROVE FOREST COMMUNITIES IN TALIDENDANG BESAR, RIAU CECEP KUSMANA
BIOTROPIA - The Southeast Asian Journal of Tropical Biology No. 4 (1991)
Publisher : SEAMEO BIOTROP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (446.32 KB) | DOI: 10.11598/btb.1991.0.4.207

Abstract

One  transect of 10 m x 900 m was  constructed perpendicular  to  the sea edge  to know  the pattern  ofmangrove forest communities from the sea edge through the inland area. Then, one sample plot of 50 m x 50 mwas established at each forest community to explore its vegetation structure and soil characteristics. The results show that in Talidendang Besar area, there are three mangrove forest communities stretchingfrom the sea edge to the inland, namely Bruguiera parviflora, B. sexangula and B. sexangula-Nypa fruticans.The soil factors such as pH.EC (electrical conductivity), % K, % Na, C-organic, N-total, NH4 (ammonia), andCEC  (cation exchange  capacity) were  regarded  important  in  influencing  the  pattern of  the mangrove  forestcommunities.
POTENTIAL ROLE OF WILD CRUCIFERS IN THE PRESERVATION OF DIADEGMA EUCEROPHAGA HORSTMAN (HYMENOPTERA: ICHNEUMONIDAE), A PARASITOID OF THE DIAMONDBACK MOTH, PLUTELLA XYLOSTELLA LINNAEUS (LEPIDOPTERA: PLUTELLIDAE) UTOMO KARTOSUWONDO
BIOTROPIA - The Southeast Asian Journal of Tropical Biology No. 4 (1991)
Publisher : SEAMEO BIOTROP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (233.609 KB) | DOI: 10.11598/btb.1991.0.4.193

Abstract

Laboratory and  field experiments were conducted to evaluate the potential role of  two species of wild crucifers  in the preservation of Diadegma eucerophaga Horstman, a parasitoid of  the diamondback moth, Plutella xylostella Linnaeus. In the laboratory, D. eucerophaga developed quite well on P. xylostella larvae fed on leaves of two species of wild cruciferous plants, Nasturtium heterophyllum BL. and Cardamine hirsuta L. These wild crucifers may serve as food and oviposition sites for P. xylostella. In the field, N. heterophyllum and C.  hirsuta  planted  adjacent  to  insecticide-treated  cabbage  plots  provided  refuge  for  D.  eucerophaga parasitoids.
A STUDY ON WEED CONTROL IN SOYBEAN S. TJITROSEMITO
BIOTROPIA - The Southeast Asian Journal of Tropical Biology No. 4 (1991)
Publisher : SEAMEO BIOTROP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11598/btb.1991.0.4.192

Abstract

Two field experiments on weed control in soybeans were carried out at BIOTROP, Bogor, Indonesia from February to June, 1989. The critical period for weed control was found to be between 20 - 40 days after planting of soybean (c. v. Wilis) grown at a planting distance of 40 x 10 cm. It did not coincide with the fastest growth  in  terms of  trifoliate  leaf number. Further studies were suggested  to understand the physiological growth of soybean related to weed control. Pendimethalin at 660- 1320 g a.e./ha applied one day after sowing did not cause any phytotoxic effect to soybean and had good weed control performance.
GROWTH AND ROOTING SYSTEM OF ACACIA MANGIUM OBTAINED BY TISSUE CULTURE IWAN SETIAWAN
BIOTROPIA - The Southeast Asian Journal of Tropical Biology No. 4 (1991)
Publisher : SEAMEO BIOTROP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11598/btb.1991.0.4.189

Abstract

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