Controle de Alternaria alternata, Colletotrichum acutatum e Phyllosticta citricarpa com os produtos Duque® , Flavon® E Straike® em Citros
Abstract
The cultivation of citrus is responsible for the development of regions and municipalities
Brazilians, standing out worldwide for the production of oranges and the export of
your juice. Phytosanitary requirements for export, as well as the loss of effectiveness
of certain agricultural pesticides are factors that make the search for
management programs and alternative control measures for crop diseases.
The objective of this work was to analyze the effect of organomineral fertilizers
Flavon® and Straike® and Duque® non-ionic adjuvant in the control of pathogens
Alternaria alternata, Colletotrichum acutatum and Phyllosticta citricarpa, as well as
evaluate the selectivity of products to citrus culture. For this, were carried out
three experiments. In the first, the in vitro fungal inhibition of the Duque® product was tested
in relation to the three pathogens. The second experiment evaluated the effectiveness of
Duque®, Flavon® and Straike® products in the control of Alternaria alternata, through
product applications in Ponkan mandarin orchards grafted on Rangpur lemon.
In the third trial, the efficacy of the Duque® and Flavon® products in the control was evaluated
of Colletotrichum acutatum through the application of the products in acid lime orchard
Tahiti grafted on Flying Dragon trifoliate. Field experiments had
randomized block design, consisting of 4 treatments and 4 replications,
whose plots had 10 plants of which 4 central plants were evaluated. The results were submitted to analysis of variance by the F test, comparing
the means using the Scott-Knott test (5%). The results obtained demonstrated
that the Duque® product controlled the mycelial growth of the three pathogens in tests
in vitro, highlighting the dose of 1.5 L ha-1 with greater inhibition of mycelial growth
in P. citricarpa and C. acutatum. It was observed that Duque® and Flavon® products
showed significant control of the incidence of Alternaria alternata on the leaves,
however, they did not differ from the control in the results for severity in the leaves and
in the fruits, and incidence in the fruits. Duque® products (1.0 and 1.5 L ha-1
) and Flavon®
(1.0 L ha-1
) proved to be superior to the control in controlling the incidence of
Colletotrichum acutatum in flowers, as well as the reduction of retained calyxes. already in
evaluation of fixed fruits, only the doses of Duque® showed increments
in the fixation of the fruits. The three products promoted increases in the productivity of the
Tahiti acid lime. Furthermore, Duque®, Flavon® and Straike® proved to be selective
to Ponkan mandarin, as well as Duque® and Flavon® did not show symptoms of
phytotoxicity to Tahiti lime plants.
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