Zanuncio J.C.,Federal University of Viçosa |
Tavares W.S.,Copener Florestal Ltda. |
Ramalho F.S.,Embrapa Algodao |
Leite G.L.D.,Federal University of Minas Gerais |
Serrao J.E.,Campus Universitario
Pesquisa Agropecuaria Brasileira | Year: 2016
The objective of this work was to evaluate spatial and temporal distributions of Sarsina violascens (Lepidoptera: Noctuidae: Lymantriinae) in two Eucalyptus cloeziana plantations, one with native vegetation strips (WNVS) and another without them (ONVS). Adults were collected with light traps, which were installed: inside an area of native vegetation (Cerrado), 100 m from the edge; at the contact zone between the native vegetation area and the E. cloeziana plantation; inside the E. cloeziana plantation, 250 m from the edge; at the central part of the native vegetation strip, around 500 m from the edge (WNVS) or in the contact zone between two E. cloeziana compartments (ONVS); and inside the E. cloeziana plantation, 500 m from the edge. The number of S. violascens adults collected was 240 in the system WNVS and 1,378 in the system ONVS. The lower number of individuals in the system WNVS was probably due to favored biological control provided by higher species richness with the use of native vegetation strips. These strips, intermingled with E. cloeziana plantations, allow a higher proportion of native forest in the landscape and can help to reduce S. violascens infestations.
Sales M.J.D.,Federal University of Sergipe |
Matos W.C.,Copener Florestal Ltda
Pesquisa Agropecuaria Brasileira | Year: 2010
The objective of this work was to evaluate the frequency and species richness of termites which occur in eucalyptus reforestation areas. The samples were collected from three recently harvested Eucalyptus areas, in December 2005, in 100 m-long and 2 m-wide transects, divided into 20 contiguous plots (2x5 m). Each plot was sampled for one hour per person, and from each subdivision, 12 disturbed soil samples were taken from 20x20x20 cm, from which 21 species of termites belonging to two families and 16 genera were collected. Ten species were found to be dominant, all belonging to the family Termitidae, from which those with the highest frequency were Amitermes amifer and Nasutitermes corniger. The functional group xylophages had the highest number of species (11) and the highest frequency. Species known as pests in eucalyptus had a frequency below the limit of dominance.
Masson M.V.,São Paulo State University |
Masson M.V.,Copener Florestal Ltda |
Moraes W.B.,São Paulo State University |
Matos W.C.,Copener Florestal Ltda |
And 2 more authors.
Summa Phytopathologica | Year: 2011
Originally from South America, eucalyptus rust is caused by the fungus Puccinia psidii, and has become a limiting disease for eucalyptus cultivation in Brazil, requiring the adoption of control measures, for example the chemical control. To evaluate the efficiency and economic viability of fungicides to control eucalyptus rust, a test has set up in the field. The experimental design adopted for the test has randomized blocks, 3 × 3 (3 products and 3 doses) in factorial arrangement, with 0.5, 1.0 and 1.5 mL or g of commercial product per liter of solution. The treatments were: 1-) control; 2-) Fungicide azoxystrobin (strobilurins); 3-) Fungicide tebuconazole (triazole); 4-) Fungicide tebuconazole + trifloxystrobin (triazole + strobilurins). Four replicates were used to assess plant disease severity based on the percentage of damaged leaf area. Higher fungicide doses led to a greater reduction of the disease in the plants at 7 and 15 days after the application. The fungicide tebuconazole + trifloxystrobin at 1.5 mL / L was the most efficient against eucalyptus rust under field conditions. The fungicide tebuconazole was the most economically viable at the three tested doses.