José Isaac Figueroa
Universidad Michoacana de San Nicolás de Hidalgo
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Publication
Featured researches published by José Isaac Figueroa.
Journal of Economic Entomology | 2010
Christian-Luis Rodríguez Enríquez; Samuel Pineda; José Isaac Figueroa; Marcela-Inés Schneider; Ana-Mabel Martínez
ABSTRACT The toxicity and sublethal effects of methoxyfenozide were evaluated in third instars of the beet armyworm, Spodoptera exigua (Hübner) (Lepidoptera: Noctuidae), that fed on contaminated semisynthetic diet. The LC50 value was estimated at 0.23 mg of active ingredient (AI)/kg diet (range, 95% CI: 0.17–0.37) at 264 h after treatment. The effects on development, survival, and reproduction were observed in third instars of this pest that survived exposure to an LC25 concentration of methoxyfenozide. The larvae from the insecticide treatment exhibited lower pupal weights, an increase in both larval and pupal developmental times and a higher frequency of malformations of the wings in adults than untreated larvae. Adults from the methoxyfenozide treatment did not show reduced fecundity (mean cumulative number of eggs laid per female), but fertility as measured by the percentage of eggs hatched (fertility) was significantly reduced compared with untreated control insects. No significant effects were observed on pupal sex ratio. We concluded that the lethal and sublethal effects of methoxyfenozide are likely to have a significant impact on S. exigua populations on treated crops.
Pest Management Science | 2012
Erika L Sántis; Luis A Hernández; Ana Mabel Martínez; Jesús Campos; José Isaac Figueroa; Philippe Lobit; Juan Manuel Chavarrieta; Elisa Viñuela; Guy Smagghe; Samuel Pineda
BACKGROUND The immediate lethality caused by spinosad has been widely studied on Spodoptera exigua (Hübner). However, long-term effects can also provide valuable information on insecticide toxic action. Here, the persistence of spinosad on Capsicum annuum L. foliage and the lethal and sublethal effects of greenhouse-aged foliar residues of this insecticide on third instars of S. exigua are reported. RESULTS Foliage was collected at 0, 3, 5, 10, 20, 30, 40 and 50 days after application, and spinosad residues were measured. Residues decreased over time according to first-order kinetics. The average rate constant and half-life of disappearance were 4.44 × 10(-3) and 156 days and 5.80 × 10(-3) and 120 days for 60 and 120 mg L(-1) respectively. Larval mortality gradually decreased, corresponding to the residues, but was still appreciable (35 and 65% for 60 and 120 mg L(-1) respectively) when the larvae were fed with foliage collected 50 days after treatment. Subsequently, pupal development was reduced and varied between 20 and 60% and between 21 and 41% for 60 and 120 mg L(-1) , respectively, in all ages of leaf residues that were bioassayed. At all time points, the consumption rate by the larvae was reduced between 62 and 84% for both concentrations that were bioassayed. CONCLUSION It is concluded that, under the present greenhouse conditions, the degradation of spinosad was slower than that reported by other authors in the field, and, because of that, its residues could cause lethal and sublethal effects to S. exigua larvae.
Pest Management Science | 2018
Saúl Pardo; Ana Mabel Martínez; José Isaac Figueroa; Juan Manuel Chavarrieta; Elisa Viñuela; Ángel Rebollar-Alviter; Mario A. Miranda; Javier Valle; Samuel Pineda
BACKGROUND Control of the Asian citrus psyllid Diaphorina citri Kuwayama, the most important pest of citrus worldwide, is based on the use of insecticides, though unsatisfactory results have recently been reported. In this study, insecticide resistance of D. citri to three insecticides (bifenthrin, malathion, and chlorpyrifos) was examined. RESULTS Three populations (designated Dci-CParácuaro, Dci-El Junco, and Dci-Antúnez) of both adults and fourth-instar D. citri individuals were collected in 2014 at two different times and on one occasion, respectively, from three locations (Crucero de Parácuaro, El Junco, and Antúnez). These locations represent the major commercial Mexican lemon production areas in the Apatzingán Valley in the state of Michoacán, Mexico. The three populations of D. citri adults and fourth-instar nymphs at the different collection times showed low levels of resistance (≤7-fold) to bifenthrin, but were very resistant to malathion (≤345- and ≤432-fold for adults and fourth instars, respectively) and chlorpyrifos (≤2435- and ≤1424-fold for adults and fourth instars, respectively). CONCLUSION Resistance levels to the tested insecticides were highly variable but homogeneous among seasons and localities. Resistance management programmes that include crop sanitation, use of biological and cultural control practices, and rotation of insecticide classes should be established, particularly in areas where D. citri has developed resistance to malathion and chlorpyrifos.
Biocontrol Science and Technology | 2016
Samuel Pineda; Manuel Medina; José Isaac Figueroa; Thomas J. Henry; Laura Verónica Mena; Juan Manuel Chavarrieta; Benjamín Gómez; Jorge Manuel Valdez; Philipphe Lobit; Ana-Mabel Martínez
ABSTRACT The life cycle and several life parameters of the zoophytophagous predator Engytatus varians (Distant) (Heteroptera: Miridae), including nymphal growth according to Dyar’s rule, were examined in the laboratory. The egg, nymph (five instars), and adult stages were 9.20, 17.36, and 19.02 d in length, respectively. The growth ratio for nymphs was consistent with Dyar’s rule based on the lengths of the femora of the forelegs, the tibiae and femora of the middle legs, and the antennae. Some biological characteristics of E. varians were also evaluated when the mirid was fed three different diets (B. cockerelli third instars, Sitotroga cerealella Olivier [Lepidoptera: Gelechiidae] eggs, and a mixture of both instars and eggs). The length of the nymphal stage was three days longer on a diet of only S. cerealella eggs than when the mirids were fed the third instars of B. cockerelli only or a mixture of both. The sex ratio was not affected by the type of diet. Nymphs of E. varians consumed B. cockerelli nymphs (80–85) when fed third instars only and third instars + S. cerealella eggs, respectively. The potential use of this predator as a biological control agent of B. cockerelli is discussed.
ZooKeys | 2011
José Isaac Figueroa; Michael J. Sharkey; Jesús Romero Nápoles; José García; Ana Mabel Martínez; Samuel Pineda
Abstract A key to species and descriptions are presented for 14 species of the New World genus Crassomicrodus Ashmead. Seven new species, Crassomicrodus azteca, Crassomicrodus clypealis, Crassomicrodus costaricensis, Crassomicrodus jalisciensis, Crassomicrodus mariae, Crassomicrodus oaxaquensis,and Crassomicrodus olgae are described. Crassomicrodus fenestratus (Viereck) is synonymized with Crassomicrodus nigriceps (Cresson). Crassomicrodus melanopleurus (Ashmead) is recognized as a valid species.
Southwestern Entomologist | 2011
Roselia Jarquín-López; Laura Martínez-Martínez; José Antonio Sánchez-García; José Isaac Figueroa
Abstract. Malpighia mexicana, or red nanche, is a plant with edible fruits, used on crafts and medicine, as well as for the establishment of living fences. The objective of this work was to catalog the parasitoids associated with Anthonomus sisyphus Clark (Coleoptera: Curculionidae) in the fruit of M. mexicana in the central valleys of Oaxaca, México. The sampling sites were located in San Lorenzo Cacaotepec and the Ethnobotanical Garden of Santo Domingo. From 2005 to 2007, mature red nanche fruits were collected weekly to determine the emergency of the parasitoids. The fruits were weighed, counted and placed in trays. The greatest infestation was found in San Lorenzo Cacaotepec with 1.16 to 1.44 weevils per fruit while in the Ethnobotanical Garden were 0.74 to 1.18 weevils per fruit. Seven different species of parasitoids belonging to the families Braconidae, Pteromalidae, and Eupelmidae were found associated with A. sisyphus. The most abundant species were Triaspis eugenii, Diospilus sp., and Bracon sp. The Ethnobotanical Garden was the site with the greatest abundance of species of parasitoids and presented the highest level of parasitism. The species with the highest proportion of males were Bracon sp. in 2005 and 2007 and T. eugenii in 2006.
Southwestern Entomologist | 2014
Ignacio López; Samuel Pineda; José Isaac Figueroa; José A. Sánchez; Ana Mabel Martínez; Roger N. Williams; Ángel Rebollar-Alviter
Abstract. The blackberry, Rubus sp., crop in the state of Michoacán, Mexico is the second-most important crop after avocado, Persea americana Mill., in relation to value of production and employment. In this study was identified a blackberry leafroller, its parasitoids, and population dynamics in two commercial orchards at Michoacán, Mexico, during the growing seasons of 2007 and 2008. Collected rolled leaves containing larvae and pupae where maintained in a laboratory until leafroller adults and their parasitoids emerged. Population dynamics of moths were determined using wing traps containing the sex pheromone of Argyrotaenia citrana (Fernald) (Lepidoptera: Tortricidae). Numbers of males caught peaked in September and November 2007 at the two locations. After these months, numbers gradually decreased to almost zero during the dry season in 2008. Moths that emerged were identified as Argyrotaenia montezumae (Walsingham) (Lepidoptera: Tortricidae). Of the A. montezumae larvae collected in the field, 38% were parasitized by Apanteles near aristoteliea Viereck (Hymenoptera: Braconidae), 9% by Colpoclypeus michoacanensis Sánchez and Figueroa (Hymenoptera: Eulophidae), and 3% by unidentified specimens of the family Ichneumonidae. Males of A. montezumae were attracted to the sex pheromone of A. citrana. The greatest number of moths trapped during the growing season coincided with the periods of intense vegetative growth and harvest.
Journal of the Kansas Entomological Society | 2010
José Isaac Figueroa; Michael J. Sharkey; Armando Burgos; Iran Alia; Samuel Pineda
Abstract Leluthia danielensis n. sp. (Hymenoptera: Braconidae), reared from Scolytopsis puncticollis Blandford (Coleoptera: Curculionidae), is described from Mexico. Illustrations of lateral and dorsal habitus and wings are provided.
Journal of Economic Entomology | 2018
Sinue I Morales; Ana Mabel Martínez; Elisa Viñuela; Juan Manuel Chavarrieta; José Isaac Figueroa; Marcela Inés Schneider; Fernando Tamayo; Samuel Pineda
Lethal and sublethal effects of refined soybean oil, imidacloprid, and abamectin on Tamarixia triozae (Burks; Hymenoptera: Eulophidae) were assessed after exposure of the eggs, larvae, and pupae of this parasitoid to three concentrations of these active substances: the LC50 for fourth-instar Bactericera cockerelli (Sulc.; Hemiptera: Triozidae) and 50% and 100% of the minimum field-registered concentration (MiFRC). Soybean oil caused 26-61% mortality in T. triozae eggs and 6-19% in larvae; mortality in both eggs and larvae was ≤19% for imidacloprid and 4-100% for abamectin. All three compounds caused <18% mortality of T. triozae pupae, with the exception of the abamectin 50% (47%) and 100% (72%) MiFRC. The mortality of larvae and pupae derived from treated eggs was ≤39% for all three insecticides, and that of pupae derived from treated larvae was ≤10%. In general, emergence of adults developed from treated eggs, larvae, and pupae was affected more by abamectin than by the other treatments. The proportion of females derived from all three development stages was not affected by treatment with the compounds, except when the parasitoid was treated as larvae with the soybean oil 100 and 50% MiFRC (66 and 68%, respectively) or when treated as pupae with the imidacloprid LC50 and 100% MiFRC (~60%). Female longevity was generally higher than that of males. The use of imidacloprid, soybean oil, and abamectin in combination with T. triozae for pest control may be effective when the parasitoid is in the pupal stage because this stage is less susceptible than other immature stages.
Journal of the Kansas Entomological Society | 2015
José Antonio Sánchez-García; José Isaac Figueroa; James B. Whitfield; Samuel Pineda; Ana Mabel Martínez
Abstract A new species of Apanteles from Mexico is described and illustrated. Apanteles montezumae Sánchez, Figueroa and Whitfield, new species, attacks Argyrotaenia montezumae Walsingham and Amorbia cuneana (Walsingham) (Lepidoptera: Tortricidae) on Rubus sp. in Michoacan state, Mexico.
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Ana Celestina Juárez-Gutiérrez
Universidad Michoacana de San Nicolás de Hidalgo
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