ISHS Acta Horticulturae 452: International Symposium on Myrtaceae
CONTROL OF RUST (PUCCINIA PSIDII) IN GUAVA (PSIDIUM GUAJAVA) |
| Authors: | J. T. Ferrari, E.M.d. Nogueira, A. J.T. dos Santos |
| Keywords: | Control, Puccinia psidii, guava (Psidium guajava) |
| Abstract:
The guava rust, caused by Puccinia psidii Wint., attacks all the young tissues of the plant and can cause losses up to 80 to 100%. With the objective of verifying the efficiency of some fungicides on such disease, an experiment was conducted in the agricultural year 1994/1995, in Louveira, State of Sao Paulo. The plants used were white Ogawa cultivars, with 4 years of age. The statistical outlining of blocks at random was used, with 6 treatments and 4 repetitions, with 3 plants per parcel of land. The fungicides used and their respective doses of active ingredient per 100 l of water were: chlorothalonil PM 75%-150g; chlorothalonil SC 508%- 150 g; mancozeb PM 80% - 160 g; mancozeb PM 80%-160g pand copper oxychloride PM 50% - 100g. The applications, in the number of 8, began in December 1994, using an average of 1 liter of fungicide mixture per plant. The evaluations were done in February and March 1995, collecting 60 fruit from the central plant, and giving grades from 0 to 5 in accordance with the affected area. The data were transformed in arc sine √  /100. For the comparison of the averages it was used F and Tukey tests at 5%. All treatments were superior to the control.
The products based on chlorothalonil were the most efficient in the control of guava rust, presenting a control above 85%.
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