Publications by authors named "R Ovejero"
Background: Crocidosema aporema (Walsingham 1914) has historically been the main bud borer species in soybean in Brazil; however, a recent study reported that this species is not C. aporema but an undescribed species. In recent seasons, injury by Crocidosema sp.
View Article and Find Full Text PDFEffects of temperature on the development of Rachiplusia nu (Lepidoptera: Noctuidae) and Chrysodeixis includens (Lepidoptera: Noctuidae) and implications on population growth in Brazil.
Environ Entomol
December 2024
Temperature is an elementary component in mathematical models for predicting the biotic potential of insects. In this study, the objective was to evaluate the impact of different constant temperatures of 8, 10, 15, 20, 25, 30, and 32°C on the biological parameters, lower temperature thresholds (TT), and estimating the number of annual generations (NAG) of Rachiplusia nu and Chrysodeixis includens, both pests associated with the soybean crop in Brazil. There was no development of the immature stages of R.
View Article and Find Full Text PDFArticle Synopsis
- - Rachiplusia nu (R. nu) has evolved from a secondary pest to a significant threat to soybean crops in Brazil and Argentina, particularly with those engineered to produce the Cry1Ac toxin, leading researchers to investigate resistance mechanisms.
- - An experiment revealed that a resistant strain of R. nu can thrive on Cry1Ac soybean leaves, showing a resistance ratio greater than 736 times, while susceptible strains quickly died off; this resistance is autosomal recessive and monogenic with minimal fitness costs.
- - The study found cross-resistance to another toxin (Cry1A.105) but not to Cry2Ab2, suggesting the combination of Cry1Ac, Cry1A.105, and Cry2Ab
Rachiplusia nu Guenée is a polyphagous species able to develop on several cultivated and non-cultivated host plants. However, basic life history information about this pest on hosts is scarce. In this study, R.
View Article and Find Full Text PDFArticle Synopsis
- The soybean bud borer in Brazil, initially identified as Crocidosema aporema, has seen recent outbreaks, but its identification and geographic history remain unclear.
- A study involving molecular and morphological analysis revealed that 80 out of 90 collected samples were likely a different species in the Crocidosema genus, indicating that they may not be C. aporema.
- The population growth of the soybean bud borer aligns with the expansion of soybean farming in Brazil, suggesting that increased agriculture may have contributed to the pest's rising numbers.