Ocorrência de Tetranychus ogmophallos Ferreira & Flechtmann (Acari: Tetranychidae) em Amendoim no Estado de São Paulo

Abstract

-High mite infestations were observed during two consecutive years (1999 and 2000) in peanut fields of cultivar IAC-Caiapó, at the Adamantina Experiment Station of Instituto Agronômico de Campinas (IAC). The mites were identified as Tetranychus ogmophallos Ferreira & Flechtmann, and the symptoms consisted of an initial silver-like chlorosis on leaves, progressing to formation of a great ammount of web structures covering the plants. For a preliminary evaluation of the damage, two 1.000 m 2 plots were marked during the 1998/99 field growing. One was not treated with pesticide and the other was chemically sprayed for mite control. In both plots, pod harvesting was done at three intervals, and pod yield within each plot was estimated as the average of harvesting intervals. Comparison between treated and untreated plots indicated a 76,5% yield reduction due to mite infestation. T. ogmophallos has been previously known from Arachis pintoi, a wild peanut species, but no report of its occurrence on cultivated peanut (Arachis hipogaea) was known.

Impact of Tetranychus ogmophallos (Acari: Tetranychidae) on different phenological stages of peanuts

“…Likewise, Lourenção et al (2001) reported a high infestation of T. ogmophallos at a peanut crop located in Adamantina -SP (Brazil) during two growing seasons. These authors found an average reduction of 76.5% in pod production of infested plants.…”

“…This pest was first reported on cultivated peanut in 2001 and probably has been misidentified for years as Tetranychus evansi Baker and Pritchard (Acari: Tetranychidae) (Ferreira and Flechtmann 1997;Lourenção et al 2001). As only reported in Brazil, T. ogmophallos is of quarantine importance to other countries (Bonato et al 2000).…”

Susceptibility ofTetranychus ogmophallos(Acari: Tetranychidae) toBeauveria bassianaandMetarhizium anisopliae

“…Palavras Chave: ácaro-vermelho-do-amendoim; Arachis hypogaea; Arachis pintoi; controle microbiano; amendoim forrageiro Peanut red mite Tetranychus ogmophallos Ferreira & Flechtmann (Acari: Tetranychidae) is considered an important emergent pest in Brazil because it causes economic and environmental losses (Lourenção et al 2001;Melville 2015). This mite is found only on Arachis spp.…”