Authors:
FUENTES-DÁVILA Guillermo, TORRES-CRUZ María Monserrat, FÉLIX-VALENCIA Pedro, ROSASJÁUREGUI Ivón Alejandra, and FÉLIX-FUENTES José Luis ,México |
Abstract:
Commercial fungicides Approach Prima CS, Priori Xtra CS, Maxtrobin Xtra CS, and Folicur
EW were evaluated in the field, to determine their biological effectiveness to control karnal bunt
(Tilletia indica) of wheat. A completely randomized design was used with four replications.
Twenty heads of cultivar Tacupeto F2001 were inoculated during the boot stage with an allantoid
sporidial suspension (10,000/mL). Commercial rates indicated in the containers of each product
were followed. The first application was carried out ten days after inoculation {Zadoks 56-58,
(Feekes 10.4-10.5)}, and the second one ten days later. Inoculated spikes were threshed by hand
and the healthy and infected kernels were counted to determine the percentage of infection. The
biological effectiveness of the products evaluated were Priori Xtra 99.2, Folicur 98.9, Approach
Prima 98.5, and Maxtrobin Xtra 85.3%. The untreated inoculated check had a mean of 36.9%
infection. There were no statistical differences for the products evaluated for level of infection
after arcsin transformation (Tukey, p = 0.05) and the coefficient of variation was 6.1%. The a
thousand grain weight was 55.3, 51.1, 54.8, and 55.1 g, respectively, and 53.6 g for the untreated
inoculated check. No phytotoxic effects to the wheat plants were observed. |
