Abstract

CORTEZ MONDACA, Edgardo; PEREZ MARQUEZ, Jesús  and  VALENZUELA ESCOBOZA, Fernando Alberto. Parasitoids of whitefly in three dates of sowing of cotton transgenic and conventional in Sinaloa. Rev. Mex. Cienc. Agríc [online]. 2017, vol.8, n.6, pp.1441-1448. ISSN 2007-0934.

The aim of the research was to define whitefly (MB) parasitoid species Bemisia tabaci Genn. Biotip “B” in varieties of transgenic cotton and conventional cotton in northern Sinaloa, in order to know if there are differences in parasitism between varieties modified with transgene and traditionally modified. Three cotton cultivars were evaluated: 1. DP 393 (conventional), 2. DP 167RF Flex Faena Solution® and 3. DP 0935B2RF Bollgard®II /Faena Flex Solution® in three plots located in the municipality of Guasave, Sinaloa, in three sowing dates. The research consisted of identifying the MB parasitoids and estimating the number of specimens obtained from large (third and fourth instar) MB nymphs present in cotton leaves, sampling at weekly intervals, and in January or February, May and June, adults of the pest insect were counted by direct inspections of leaves of the fifth apical knot in the upper stratum of the plant. A total of 771 MB parasitoid specimens were obtained in the three plots and in all cases the identified species was Eretmocerus eremicus (Rose and Zolnerowich). No significant differences between treatments (p> 0.05) regarding the number of parasitoids/ cotton leaf in MB nymphs, or abundance of adult MB were observed and its populations were significantly higher in the later planting date of autumn-winter.

Keywords : biological control; planting dates; population dynamics; breeding.

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