RECORD OF Digonogastra sp. (HYMENOPTERA: BRACONIDAE) PARASITIZING Diatraea flavipennella (LEPIDOPTERA: CRAMBIDAE) IN ALAGOAS, BRAZIL

Valente, Ellen Carine Neves; Broglio, Sônia Maria Forti; Dias-Pini, Nívia da Silva; Lima, André Suêldo Tavares de; Micheletti, Lígia Broglio

doi:10.1590/1983-21252018v31n228rc

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“…The sugarcane borer complex, D. saccharalis and D. flavipennella, are the main sugarcane pests of the Americas, infesting all the phenological stages of the crop (White et al 2011, Dinardo-Miranda et al 2014, Valente et al 2018. Sugarcane borer infestations result in direct injuries due to the galleries opened along the sugarcane stalks, which can reduce yield and, indirectly opens entrance to fungi colonization resulting in sugarcane red rot (Pannuti et al 2013).…”

Section: Introductionmentioning

confidence: 99%

Tetrastischus howardi density and dispersal toward augmentation biological control of sugarcane borer

et al. 2018

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The number of Tetrastischus howardi (Olliff) females to be released and their dispersion should be known, that way, used D. saccharalis pupae as sentinel host to measure parasitism as function of the release density of the parasitoid and its location in the field. Two sets of trials were run aiming first to define the number of parasitoids to be released and the dispersal of the parasitoid using plots in sugarcane commercial fields, respectively. Pieces of sugarcane stalk holding sentinel pupae were taken to the field and exposed to parasitism in both trials. The parasitoid was released at the rate of 20, 40, 80, and 160 females per sentinel pupa, except for the control plot without releasing. The parasitism rate was calculated based on the recovered pupae after 96 h of exposure time from releasing the parasitoids. The models estimated the best parasitism rate by releasing 102 parasitoids per pupa. In the second trial, sentinel pupae were arranged in five subsequent circles corresponding 4, 8, 12, 16, and 20 m around the central parasitoid releasing point at rate of 4, 8, 12, 16, and 18 pupae per circle. The mean estimated dispersal distance was 7.64 m, with a covering area of 80.07 m 2 . Based on these findings, release of T. howardi is recommended in 125 points per hectare of sugarcane at rate of 102 females per pupa of the pest aiming to achieve homogeneous distribution and parasitism.

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