Resistência de genótipos de sorgo a Contarinia sorghicola (Coq.) (Diptera: Cecidomyiidae) e Diatraea saccharalis (Fabr.) (Lepidoptera: Pyralidae) e influência sobre parasitóides

Lara, F. M.; Foss, Mauro R. D. A.; Boiça, Arlindo Leal; Trigo, José G.

doi:10.1590/s0301-80591997000200015

Cited by 5 publications

(3 citation statements)

References 6 publications

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“…This study showed a mean stem borer injury of 12.11% for hybrid BRS373 without insecticide treatment, which is equivalent to twice that found by Lara et al. (1997) when evaluating the pest infestation in sorghum. These authors also found greater stem borer injury of SCB in the 2nd‐season planting, which was about three times lower than that found herein in the plants without chlorantraniliprole treatment.…”

Section: Discussionsupporting

confidence: 70%

What is the potential of sugarcane borer in reducing sorghum fitness and grain production?

da Silva Fernandes Souza,

de Souza,

Fadini

et al. 2024

J Applied Entomology

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Pest attack is an important biotic threat to sorghum productivity, and one of the main insect pests of grain sorghum is sugarcane borer (SCB) Diatraea saccharalis. Despite the importance of this insect species, little is known about the relationship between SCB infestation and reduction in sorghum grain yield, as well as on the gain threshold and economic injury level for decision making of pest control. This study evaluated the influence of SCB infestation on plant performance and grain production in three commercial grain sorghum hybrids. Hybrids AG1090, BRS 373, and DKB 590 were planted in three crop seasons in Sete Lagoas, Brazil, and six treatments were assessed in the experiments, consisting of three grain sorghum hybrids with and without the insecticide chlorantraniliprole at 52.5 g a.i. ha−1 under SCB natural infestation. The parameters evaluated on sorghum plants were the length of tunnels, plant height, length and weight of panicles, stem borer injury, and grain yield. The infestation of SCB was higher when sorghum plants were not treated with insecticide, resulting in lower productivity. The use of insecticide increased plant height, reduced tunnel length, and increased panicle length and weight. Hybrids only affected panicle weight. The hybrid that presented the highest panicle weight when using the insecticide was AG 1090. Hybrids AG 1090 and DKB 590 showed reduced grain production with increasing gallery length, whereas BRS 373 did not show a significant correlation, which may suggest a certain level of tolerance to SCB attack. This is the first study that determines the gain threshold and economic injury level and that effectively shows how much grain yield is lost by SCB attack in grain sorghum hybrids.

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Section: Discussionsupporting

confidence: 70%

What is the potential of sugarcane borer in reducing sorghum fitness and grain production?

da Silva Fernandes Souza,

de Souza,

Fadini

et al. 2024

J Applied Entomology

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“…As the number of cuts and plant ages explained the spatial variation of D. saccharalis and the tachinid populations, the tachinids could respond either to the spatial variation of their host or, to a lesser extent, to habitat modifications, because tachinids also responded significantly to different varieties in the São João Mill, a response not observed in D. saccharalis (table 5). Host plants of arthropod pests may directly or indirectly affect parasitoids and predators through multitrophic interactions ( Lara et al., 1997; Bottrell et al., 1998; Gullan and Cranston , 2000). Thus, underlying characteristics of sugarcane cultivation may directly and indirectly affect the spatial distribution of the tachinids, through the induction of different parasitoid dispersal patterns and changes in host distribution, respectively.…”

Section: Discussionmentioning

confidence: 99%

“…Varieties can be either susceptible or resistant to a given pest ( Gullan and Cranston , 2000), and therefore diversified systems seem to be a major determinant in promoting higher spatial and temporal variability of pest populations than homogeneous crop systems. Host plants of arthropod pests may also affect parasitoids and predators directly or indirectly through multitrophic interactions ( Lara et al., 1997; Bottrell et al., 1998; Gullan and Cranston , 2000). Multitrophic effects often involve interactions that are not well understood, and their impact on natural enemies and biological control are difficult to predict ( Bottrell et al., 1998).…”

Section: Introductionmentioning

confidence: 99%

Possible causes of spatial variability inDiatraea saccharalisFabr. (Lep., Crambidae) and its parasitoid populations in sugarcane fields in Brazil

Rossi

2003

J Applied Entomology

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Based on the large data set stored in some sugarcane mills regarding the biological control programme of Diatraea saccharalis using the parasitoids Cotesia flavipes and tachinid flies, the aim of the present study was to determine whether sugarcane varieties, number of cuts and plant ages are major determinants in promoting spatial variability in D. saccharalis, C. flavipes and tachinid fly populations in sugarcane fields in the state of Sa˜o Paulo (Brazil). The data set used to support this study was provided by the Sa˜o Joa˜o and Barra sugarcane mills. Coefficient of variation was adopted as a measure of the spatial variability of population density. Spatial variability was estimated for the total density of D. saccharalis (parasitized + unparasitized larvae), and also for D. saccharalis larvae parasitized by tachinids and by C. flavipes. Statistical analysis revealed that the spatial variation in D. saccharalis populations was influenced by the number of cuts and by plant ages in the Barra and Sa˜o Joa˜o Mills, respectively. Similar results were obtained for D. saccharalis larvae parasitized by tachinids; however, in the Sa˜o Joa˜o Mill, the spatial variability of these populations was also influenced by the different number of varieties. Finally, considering D. saccharalis larvae parasitized by C. flavipes, no significant regressions with any of the three categories were observed for both sugarcane mills. The multitrophic implications for this agricultural system are also discussed.

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Preferência de Cotesia flavipes (Cameron, 1891) (Hymenoptera: Braconidae) por lagartas de Diatraea saccharalis (Fabricius, 1794) (Lepidoptera: Crambidae) alimentadas com diferentes cultivares de cana-de-açúcar

et al. 2014

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Preferência deO objetivo desta pesquisa foi avaliar a preferência do parasitoide Cotesia flavipes (Hymenoptera: Braconidae) por lagartas de Diatraea saccharalis (Lepidoptera: Crambidae), alimentadas com diferentes cultivares de cana-de-açúcar. O experimento foi conduzido em laboratório, em duas condições de alimentação, uma envolvendo lagartas de D. saccharalis, alimentadas em dieta artificial, e, a outra, com lagartas alimentadas em dieta artificial e mantidas temporariamente nos toletes dos cultivares de cana-de-açúcar. Os cultivares utilizados foram: SP80-1842 e SP81-3250, resistentes, e RB855536, suscetível à D. saccharalis. A preferência para oviposição das fêmeas de C. flavipes foi avaliada em testes com e sem chance de escolha, em delineamento inteiramente casualizado, com quatro tratamentos e 15 repetições. Lagartas de D. saccharalis com 19 dias de idade foram oferecidas para fêmeas de C. flavipes, acasaladas e com 24 horas de idade, em ambos os testes. No teste com chance de escolha, utilizou-se um olfatômetro, o qual constou de quatro compartimentos, em cujo centro liberaram-se quatro fêmeas de C. flavipes, enquanto, no teste sem chance de escolha, foram utilizadas placas de Petri, no interior das quais se colocou uma lagarta de D. saccharalis, oriunda das duas condições de alimentação. Nestes testes, foi observada a percentagem de parasitismo e, continuamente, o comportamento da primeira escolha de fêmeas de C. flavipes, em intervalos de zero a um, um a três, três a cinco, cinco a oito e de oito a dez minutos após as liberações. Lagartas de D. saccharalis, oriundas da alimentação em dieta artificial com colmos triturados dos cultivares, foram igualmente preferidas para atratividade de fêmeas do parasitoide C. flavipes. A percentagem de parasitismo de lagartas de D. saccharalis, criadas com dietas artificiais com colmos dos cultivares SP80-1042 e RB855536, foi igualmente parasitadas por C. flavipes. Palavras-chave: Saccharum spp., resistência extrínseca, broca-da-cana, controle biológico, parasitoide. The objective of this study was to evaluate the preference of the parasitoid C. flavipes (Hymenoptera: Braconidae) for larvae of Diatraea saccharalis (Lepidoptera: Crambidae) fed on different sugarcane cultivars. The experiments

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Resistência de genótipos de sorgo a Contarinia sorghicola (Coq.) (Diptera: Cecidomyiidae) e Diatraea saccharalis (Fabr.) (Lepidoptera: Pyralidae) e influência sobre parasitóides

Cited by 5 publications

References 6 publications

What is the potential of sugarcane borer in reducing sorghum fitness and grain production?

What is the potential of sugarcane borer in reducing sorghum fitness and grain production?

Possible causes of spatial variability inDiatraea saccharalisFabr. (Lep., Crambidae) and its parasitoid populations in sugarcane fields in Brazil

Preferência de Cotesia flavipes (Cameron, 1891) (Hymenoptera: Braconidae) por lagartas de Diatraea saccharalis (Fabricius, 1794) (Lepidoptera: Crambidae) alimentadas com diferentes cultivares de cana-de-açúcar

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