Articles
CONTROL OF RUST (PUCCINIA PSIDII) IN GUAVA (PSIDIUM GUAJAVA)
Article number
452_8
Pages
55 – 58
Language
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%.
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%.
Publication
Authors
J. T. Ferrari, E.M.d. Nogueira, A. J.T. dos Santos
Keywords
Control, Puccinia psidii, guava (Psidium guajava)
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