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Alagoinhas, Brazil

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. Source

Masson M.V.,Sao Paulo State University | Masson M.V.,Copener Florestal Ltda | Moraes W.B.,Sao Paulo State University | Matos W.C.,Copener Florestal Ltda | And 2 more authors.
Summa Phytopathologica

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. Source

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