131 research outputs found
Pathogenicity of entomopathogenic fungus Metarhizium spp. against predators Menochilus sexmaculatus Fabricius (Coleoptera: Coccinellidae)
No full textTrizelia, Busniah M, Agung Permadi A. 2017. Pathogenicity of entomopathogenic fungus Metarhizium spp. against predators Menochilus sexmaculatus Fabricius (Coleoptera: Coccinellidae). Asian J Agric 1: 1-5. Metarhizium spp is an entomopathogenic fungus which has wide host range. Metarhizium spp can not only infect insect pests, but can also infect beneficial insects such as predators. The pathogenicity of four isolates of Metarhizium spp. was investigated against Menochilus sexmaculatus predator. Isolates of Metarhizium spp were isolated from rhizosphere of cacao, cabbage, chili, and rubber crops. The experiment was conducted by treating the fourth instar larvae with an appropriate conidial suspension of 108 conidia mL-1. The results showed that all isolates of Metarhizium spp were pathogenic toward beetle predator M. sexmaculatus. Mortality of larvae within seven days after application of conidial suspension varied between 27.50 to 67.50% and there were statistically significant differences among the tested isolates. Metarhizium spp. had also a significant affect in reducing pupation and adult emergence of M. sexmaculatus to below 30% and 3%, respectively. These studies indicate that entomopathogenic fungus Metarhizium spp was pathogenic to beetle predators, M. sexmaculatus.</jats:p
Diversity of plant species in paddy ecosystem in West Sumatra, Indonesia
No full textTauruslina EA, Trizelia, Yaherwandi, Hamid H. 2017. Diversity of plant species in paddy ecosystem in West Sumatra. Biodiversitas 18: 1218-1225. Community is a group of living things which have adjusted and inhabited a natural habitat. Characteristics of the community in an environment are its diversity. The diversity of the plants is a plant species that occupy an ecosystem. The research was aimed at determining species diversity, the dominance of plant species and summed dominance ratio (SDR) in paddy ecosystem. The plant samples were taken from the location of endemic areas of brown plant hopper in Tanjung Mutiara Subdistrict, Agam District West Sumatra. Sampling was done by using two methods, (i) survey methods with direct data collection; (ii) squares method, observation of sample plots in the field. The level of diversity of plant species was analyzed using diversity index of Shannon-Wiener (H’). Plant species dominance was analyzed using dominance index (C). The results showed that index value of Shannon-Wienner ranged 1.00 – 1.73, which indicated that the category of diversity level of plants was medium. Dominance index ranged 0.03 - 0.08 which meant there were a dominant species among the plants in the study areas. The highest SDR in the ecosystem type III were Cyperus rotundus (40.87%) and Borreria laevis (37.43%), in the type I was C. rotundus (34.90%) and in type II was Portulaca oleracea (20.08%). The dominant plant species found in the type I were C. rotundus, Eleusine indica, Borreria laevis, in type II were P. oleracea, C. rotundus, Amaranthus spinosus and in type III were C. rotundus, B. laevis, and A. spinosus.</jats:p
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