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German Vargas - One of the best experts on this subject based on the ideXlab platform.
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The gregarious parasitoid Cotesia flavipes displays a high level of preadaptation to a novel host, Diatraea indigenella
Biocontrol, 2019Co-Authors: C. Londoño-sánchez, James Montoya-lerma, J.p. Michaud, German VargasAbstract:Cotesia flavipes Cameron (Hymenoptera: Braconidae) is often augmented against Diatraea spp. (Lepidoptera: Crambidae) stem borers in the Americas. Diatraea indigenella Dyar and Heinrich, an endemic pest of sugarcane in southern Colombia, represents a novel host for C. flavipes. We examined the development of C. flavipes on D. indigenella and D. saccharalis, a familiar host, when larvae were stung by one, two or three wasps. Host species had no effect on parasitism success, immature parasitoid mortality, parasitoid developmental time, adult emergence, or female size. Superparasitized D. indigenella hosts yielded more cocoons, more adults, and more female wasps than those parasitized with a single sting, or from D. saccharalis hosts. However, wasp survival and longevity declined when host larvae were stung three times. Thus, D. indigenella was a more suitable host for C. flavipes when superparasitized, and appears suitable for augmentation against this emergent pest and other Diatraea species attacking sugarcane.
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host resistance to two parasitoids diptera tachinidae helps explain a regional outbreak of novel Diatraea spp stem borers lepidoptera crambidae in colombia sugarcane
Biological Control, 2019Co-Authors: James Montoyalerma, J.p. Michaud, Claudia Echeverrirubiano, German VargasAbstract:Abstract Lydella minense and Billaea claripalpis (Diptera: Tachinidae) are important parasitoids used in augmentation biological control of sugarcane stem borers, Diatraea spp. (Lepidoptera: Crambidae), the primary pests of sugarcane in Colombia. Following the recent discovery of two new Diatraea species in the Cauca River Valley (CRV), D. tabernella and D. busckella, stalk-boring damage to sugarcane has increased and rates of larval parasitism have declined. The present study assessed the suitability of all four stalk-boring Diatraea species now present in the CRV, D. tabernella, D. busckella, D. indigenella and D. saccharalis, as hosts for the two parasitoids. Following manual inoculation of larvae with maggots of L. minense and B. claripalpis, the development, immature survival, sex ratio and longevity of resulting flies were recorded. Both parasitoid species parasitized a lower percentage of D. tabernella and D. busckella larvae compared to larvae of D. saccharalis or D. indigenella. Although host larvae were more likely to yield two puparia of L. minense than of B. claripalpis, the likelihood of a second puparium was reduced when L. minense parasitized D. tabernella and D. busckella. These results suggest these two Diatraea species have resistance to parasitism by the tachinids, which might explain why outbreaks of these pests have occurred in the regions of the CRV where commercial releases of the parasitoids are relied upon as the primary pest management tactic. Although breeding programs may eventually provide flies with improved ability to parasitize these novel host species, additional work is warranted to explore alternative pest management tactics for these stem borers.
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the Diatraea complex lepidoptera crambidae in colombia s cauca river valley making a case for the geographically localized approach
Neotropical Entomology, 2018Co-Authors: German Vargas, L A Lastra, G D Ramirez, M A SolisAbstract:The sugarcane stem borers Diatraea saccharalis (Fabricius) and D. indigenella Dyar & Heinrich are common pests of sugarcane crops in Colombia’s Cauca river valley (CRV). In 2012, however, D. tabernella Dyar was recorded for the first time in northern CRV and just 1 year later, D. busckella Dyar & Heinrich was detected, also for the first time, in central CRV. The Diatraea outbreak in the CRV was studied, its distribution and population in the region was analyzed, and levels of larval parasitism were observed. During the study of the outbreak, Diatraea species in the CRV were characterized based on the morphology of larval, pupal, and adult stages. Keys to the identification of Diatraea in the CRV based on male genitalia and pupa are provided. Pupal cephalic horns and lateral lobes were discovered as new, reliable characteristics to separate the species at the pupal stage. We suggest biological control program modifications to decrease economic impact and studies at geographically localized levels to better understand the dynamics between the pest species and their parasitoids.
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The Diatraea Complex (Lepidoptera: Crambidae) in Colombia’s Cauca River Valley: Making a Case for the Geographically Localized Approach
Neotropical Entomology, 2017Co-Authors: German Vargas, L A Lastra, G D Ramirez, M A SolisAbstract:The sugarcane stem borers Diatraea saccharalis (Fabricius) and D. indigenella Dyar & Heinrich are common pests of sugarcane crops in Colombia’s Cauca river valley (CRV). In 2012, however, D. tabernella Dyar was recorded for the first time in northern CRV and just 1 year later, D. busckella Dyar & Heinrich was detected, also for the first time, in central CRV. The Diatraea outbreak in the CRV was studied, its distribution and population in the region was analyzed, and levels of larval parasitism were observed. During the study of the outbreak, Diatraea species in the CRV were characterized based on the morphology of larval, pupal, and adult stages. Keys to the identification of Diatraea in the CRV based on male genitalia and pupa are provided. Pupal cephalic horns and lateral lobes were discovered as new, reliable characteristics to separate the species at the pupal stage. We suggest biological control program modifications to decrease economic impact and studies at geographically localized levels to better understand the dynamics between the pest species and their parasitoids.
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identification of Diatraea spp lepidoptera crambidae based on cytochrome oxidase ii
PLOS ONE, 2017Co-Authors: Gloria Barrera, Laura Villamizar, Carlos Espinel, Edgar Mauricio Quintero, Mariano Nicolas Belaich, Deisy Liseth Toloza, Pablo Daniel Ghiringhelli, German VargasAbstract:Diatraea spp. (Lepidoptera: Crambidae) are a group of insects that are agriculture pests in many economically relevant crops such as sugarcane, sorghum, corn and rice. Recognized species for this genus respond differentially to natural enemies used in their biological control, emphasizing the importance of species in a regional approach. Currently, identification is based on the male genitalia. However, the availability of specimens collected from field and subjectivity based on the character recognition can seriously hamper species identification, and therefore result in inadequate pest management. To overcome this, individuals of Diatraea spp. preliminarily classified male genitalia and obtained from reared conditions and the field (both derived from natural populations occurring in Colombia) were analyzed using genitalic morphometry and molecular biology specifically using a fragment of the cytochrome oxidase subunit II (CO II) mitochondrial gene. Although morphometric analysis did not show any overriding results regarding genitalia morphology, the bioinformatics analyses of CO II sequences resulted in an adequate classification of the individuals within the recognized species. It also, revealed that the occurrence of clades associated with geographical distribution may be associated with cryptic species. The latter was also confirmed by a Single-Strand Conformation Polymorphism (SSCP) methodology evaluating the same fragment of CO II. This experimental approach allows properly recognizing each species and in consequence is proposed as an effective tool in Diatraea species identification.
Elisa Aparecida Gregorio - One of the best experts on this subject based on the ideXlab platform.
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morphometry of the midgut epithelium of Diatraea saccharalis fabricius 1794 lepidoptera parasitized by cotesia flavipes cameron 1891 hymenoptera
Journal of Invertebrate Pathology, 2006Co-Authors: Daniela O Pinheiro, Reinaldo Jose Da Silva, Elisa Aparecida GregorioAbstract:The morphometric study of the midgut in Diatraea saccharalis (Lepidoptera) larvae parasitized by the Cotesia flavipes (Hymenoptera) showed that there was significant increase in the columnar, goblet and regenerative cells and their nuclei; the midgut lumen diameter and the epithelial height were also increased in the parasitized larvae. The multivariate analysis showed that parasitism affected the columnar cell only in the posterior region, and the goblet cells along the midgut length (anterior and posterior regions).
Rikard C Unelius - One of the best experts on this subject based on the ideXlab platform.
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electrophysiological studies and identification of possible sex pheromone components of brazilian populations of the sugarcane borer Diatraea saccharalis
Zeitschrift für Naturforschung C, 2002Co-Authors: Luciane G Batistapereira, Ellen M Santangelo, Kathrin Stein, Rikard C Unelius, Alvaro E Eiras, Arlene G CorreaAbstract:Virgin female gland extracts of sugarcane moth Diatraea saccharalis (Fabricius) (Lepidoptera: Pyralidae), from three locations in Brazil, have been analyzed. By GC-MS analysis and comparison of the ...
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identification syntheses and characterization of the geometric isomers of 9 11 hexadecadienal from female pheromone glands of the sugar cane borer Diatraea saccharalis
Journal of Natural Products, 2002Co-Authors: Ellen M Santangelo, Myrian Coracini, Peter Witzgall, And Arlene G Correa, Rikard C UneliusAbstract:Chemical analysis of the pheromone glands of the sugar cane borer Diatraea saccharalis has shown the presence of the four geometric isomers of 9,11-hexadecadienal (1-4), in addition to hexadecanal and (Z)-hexadec-11-enal. We here report the syntheses and characterization of compounds 1-4. One starting material, 9-decen-1-ol, has been used to obtain all of them via divergent synthetic routes.
Alma M Solis - One of the best experts on this subject based on the ideXlab platform.
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host plant associated genetic divergence of two Diatraea spp lepidoptera crambidae stemborers on novel crop plants
Ecology and Evolution, 2016Co-Authors: Andrea L Joyce, Miguel Sermeno Chicas, Leopoldo Serrano Cervantes, Miguel Paniagua, Sonja J Scheffer, Alma M SolisAbstract:Diatraea lineolata and Diatraea saccharalis (Lepidoptera: Crambidae) are moths with stemboring larvae that feed and develop on economically important grasses. This study investigated whether these moths have diverged from a native host plant, corn, onto introduced crop plants including sorghum, sugarcane, and rice. Diatraea larvae were collected from these four host plants throughout the year in El Salvador and were reared on artificial diet until moths or parasitoids emerged. Adult moths were subsequently identified to species. Amplified fragment length polymorphisms (AFLPs) and mitochondrial DNA cytochrome oxidase I (COI) were used to examine whether or not there was genetic divergence of D. lineolata or D. saccharalis populations on the four host plants. Percent parasitism was also determined for each moth on its host plants. D. lineolata was collected from corn in the rainy season and sorghum in the dry season. D. saccharalis was most abundant on sugarcane in the rainy season and sorghum in the dry season. The AFLP analysis found two genetically divergent populations of both D. lineolata and D. saccharalis. Both moths had high levels of parasitism on their dominant host plant in the rainy season, yet had low levels of parasitism on sorghum in the dry season. The presence of two genotypes of both Diatraea spp. on sorghum suggest that host-associated differentiation is occurring on this novel introduced crop plant.
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a new cryptic species of Diatraea lepidoptera crambidae crambinae feeding on eastern gama grass and a novel host association with a braconid hymenoptera in the united states
Annals of The Entomological Society of America, 2015Co-Authors: Alma M Solis, Sonja J Scheffer, M A Metz, Matthew L Lewis, Robert R Kula, T L SpringerAbstract:ABSTRACT A new species, Diatraea mitteri Solis, that had been residing cryptically as Diatraea crambidoides (Grote), feeding on eastern gama grass (Tripsacum dactyloides (L.) L., is described. D. crambidoides occurs in the southern United States and Mexico and is an economic pest of corn (Zea mays L.). It has been reported to also feed on sorghum (Sorghum bicolor (L.) Moench), johnsongrass (Sorghum halepense (L.) Persoon), and sugar cane (Saccharum officinarum L.). We confirm that D. crambidoides also feeds on eastern gama grass. Morphological and molecular characters support the status of D. mitteri as a new species. Parsimony analysis resulted in two clades corresponding to D. crambidoides and D. mitteri. We confirm the distribution of D. mitteri from Kansas, Oklahoma, and Texas, but its distribution could be as broad as the remaining range of eastern gama grass in the eastern United States. All the life stages are described and illustrated. A novel host association, Alabagrus imitatus Cresson (Hymenopt...
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first record of Diatraea tabernella lepidoptera crambidae in the caucariver valley of colombia
Florida Entomologist, 2013Co-Authors: German Vargas, L A Lastra, Alma M SolisAbstract:SUMMARY Diatraea tabernella is recorded for the first time in the Cauca River Valley of Colombia. Even though there has been no information on the status of D. tabernella in Colombia for almost a century, its recent appearance creates concern about its potential economic importance by virtue of its abundance and distribution in the northern region of the Cauca River Valley. Descriptions of the pupae and the male genitalia of D. saccharalis, D. indigenella, and D. tabernella are given, together with a key to aid in the identification of Diatraea species in the region. Also information and perspectives on biological control of D. tabernella are presented.
Daniela O Pinheiro - One of the best experts on this subject based on the ideXlab platform.
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morphometry of the midgut epithelium of Diatraea saccharalis fabricius 1794 lepidoptera parasitized by cotesia flavipes cameron 1891 hymenoptera
Journal of Invertebrate Pathology, 2006Co-Authors: Daniela O Pinheiro, Reinaldo Jose Da Silva, Elisa Aparecida GregorioAbstract:The morphometric study of the midgut in Diatraea saccharalis (Lepidoptera) larvae parasitized by the Cotesia flavipes (Hymenoptera) showed that there was significant increase in the columnar, goblet and regenerative cells and their nuclei; the midgut lumen diameter and the epithelial height were also increased in the parasitized larvae. The multivariate analysis showed that parasitism affected the columnar cell only in the posterior region, and the goblet cells along the midgut length (anterior and posterior regions).