Diversity of arthropods associated to Brachiaria spp. and damage indexes of insect-pests
Article Sidebar
Main Article Content
Abstract
ruziziensis x Brachiaria brizantha) cv. mulato 1 and Brachiaria decumbens cv. Basilisk, and evaluate damage indexes. Periodical random samplings were performed once a month for three years. A sample of 20 sweep/plot was taken and, according to the visual sampling, the damage caused by biting, chewing, sweep and sucking insects was determined. Results demonstrated superiority of Insecta
class, with six orders, eight families and 21 identified morpho-species, in contrast to Arachnida class. The levels of provoked damage did not surpass degree two of damage scale, so it is considered as light.
Basilisk variety showed less resistance to insect-pest attacks, although there was no economic damage. Species richness had a slight increase during rainy season (22), in contrast to dry season (20). Basilisk
variety showed the highest number of individuals during dry season (130) and during rainy period (193). Shannon index ranged between 2.38 and 2.65. There was no associated dominant species, according to the values (0.09 to 0.12). It can be concluded the arthropods associated to Brachiaria genus, Insecta class shows higher expression, with an increase during rainy season. However, without dominance among present species, phytophagous and bioregulators, during the seasons, these species manage to live in harmony, without provoking economic damages among varieties and cultivars under study. It is recommended to continue studies on arthropod population in other varieties of Brachiaria, with other crop management.
Key words: Brachiaria spp., insect-pest, damages, diversity
Article Details
Those authors that have publications with this journal accept the following terms:
1. They will retain their copyright and guarantee the journal the right of first publication of their work, which will be simultaneously subject to the License Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0) that allows third parties to share the work whenever its author is indicated and its first publication this journal. Under this license the author will be free of:
- Share — copy and redistribute the material in any medium or format
- Adapt — remix, transform, and build upon the material
- The licensor cannot revoke these freedoms as long as you follow the license terms.
Under the following terms:
- Attribution — You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
- NonCommercial — You may not use the material for commercial purposes.
- No additional restrictions — You may not apply legal terms or technological measures that legally restrict others from doing anything the license permits.
2. The authors may adopt other non-exclusive license agreements to distribute the published version of the work (e.g., deposit it in an institutional telematics file or publish it in a monographic volume) whenever the initial publication is indicated in this journal.
3. The authors are allowed and recommended disseminating their work through the Internet (e.g. in institutional telematics archives or on their website) before and during the submission process, which can produce interesting exchanges and increase the citations of the published work. (See the Effect of open access).