Article
Biochemistry & Molecular Biology
Sajjan Grover, Juan Betancurt Cardona, Prince Zogli, Sophie Alvarez, Michael J. Naldrett, Scott E. Sattler, Joe Louis
Summary: This study revealed the proteomic changes in SCA resistant sorghum after SCA infestation, showing the suppression of plant defense-related proteins and upregulation of plant defense and signaling-related proteins. The findings were further validated through electrical penetration graph technique, which observed changes in aphid feeding behavior. These results provide insights into the mechanisms underlying sorghum resistance to SCA.
Article
Biochemistry & Molecular Biology
Desalegn D. Serba, Xiaoxi Meng, James Schnable, Elfadil Bashir, J. P. Michaud, P. V. Vara Prasad, Ramasamy Perumal
Summary: The study used RNA-Seq technology to analyze the effects of sugarcane aphid on moderately resistant and susceptible genotypes, revealing transcriptome differences between the two genotypes at multiple time points after infestation by SCA. The resistant genotype exhibited differential expression of several gene clusters during SCA infestation, while the susceptible genotype showed a series of down-regulated genes on the basis of the resistant genotype.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2021)
Article
Agronomy
Hugo E. Cuevas, Joseph E. Knoll, Karen R. Harris-Shultz, Somashekhar M. Punnuri
Summary: The Sugarcane aphid is a destructive pest that has caused economic damage to sorghum in North America since 2013. Identifying and using resistant sorghum germplasm is an effective strategy for controlling this pest. Researchers have discovered a sorghum line, SC112-14, that has strong resistance to the Sugarcane aphid, and this resistance is controlled by a specific genetic region on chromosome 6.
Article
Plant Sciences
Camille Carey, J. Scott Armstrong, Chad Hayes, W. Wyatt Hoback, Ali Zarrabi
Summary: By converting known sugarcane aphid-resistant sorghum into A3 cytoplasmic male sterility, we have shown that these sterile counterparts also possess tolerance and antibiosis to sugarcane aphid. This has significant implications for the development of sugarcane aphid-resistant forage sorghums.
Article
Biochemistry & Molecular Biology
Juan Betancurt Cardona, Sajjan Grover, Michael J. Bowman, Lucas Busta, Pritha Kundu, Kyle G. Koch, Gautam Sarath, Scott E. Sattler, Joe Louis
Summary: The study investigates the influence of plant age, cuticular waxes, and sugar levels on the establishment and feeding behavior of sugarcane aphid (SCA) on sorghum plants. It is found that six-week-old plants are more preferred by SCA for feeding compared to two-week-old plants. The abundance of specific wax compounds and sugar contents differ between the two age groups, with alpha-amyrin and isoarborinone increasing after SCA infestation in the six-week-old plants. The study concludes that plant age and variations in triterpenoids and sugars play a crucial role in SCA establishment on sorghum plants.
Article
Entomology
John W. Gordy, Nicholas J. Seiter, David L. Kerns, Francis P. F. Reay-Jones, Robert D. Bowling, M. O. Way, Michael J. Brewer
Summary: The study demonstrated that for partially resistant sorghum hybrids, the maximum density and reproductive rate of sugarcane aphids were lower compared to susceptible hybrids, resulting in less or negligible yield loss.
JOURNAL OF ECONOMIC ENTOMOLOGY
(2021)
Article
Multidisciplinary Sciences
Samuel Nibouche, Laurent Costet, Raul F. Medina, Jocelyn R. Holt, Joelle Sadeyen, Anne-Sophie Zoogones, Paul Brown, Roger L. Blackman
Summary: This study used morphometric and molecular data to better characterize the discrimination between two aphid species, M. sacchari and M. sorghi. Morphometric analysis confirmed the separation of the species, while microsatellite data delimited two clusters corresponding to the morphological separation. DNA sequencing revealed slight divergence and one diagnostic SNP for species separation. The invasive genotype damaging sorghum in the US, Mexico, and the Caribbean was identified as M. sorghi based on morphological and molecular evidence.
Article
Agronomy
Zane Jenkins, Sushil Thapa, Jourdan M. Bell, Kirk E. Jessup, Brock C. Blaser, Bob A. Stewart, Qingwu Xue
Summary: This study examined the effects of planting date and hybrid selection on grain sorghum production, water use efficiency, and sugarcane aphid infestation in the Texas High Plains. The results showed significant differences in yield and aphid population among different planting dates and hybrids. Grain yield was more related to seeds per plant than to kernel weight and harvest index.
Article
Agronomy
Wilfrid Calvin, Julien M. Beuzelin, Oscar E. Liburd, Marc A. Branham, Ludger Jean Simon
Summary: The study indicates that biological insecticides such as azadirachtin, pyrethrins, and B. bassiana have the potential to control M. sacchari infestations in sorghum under favorable environmental conditions.
Article
Entomology
Romain Exilien, Jacques Brodeur, Valerie Fournier, Xavier Martini
Summary: A survey was conducted in Haiti to investigate factors leading to outbreaks of sugarcane aphid in sorghum. Results showed that infestation was higher in spring and varied according to different phenological stages. Natural enemies such as ladybeetles, hoverflies, lacewings, predatory midges, and parasitoid species were found to affect the population density of M. sacchari, with more biological control observed in fall.
JOURNAL OF ECONOMIC ENTOMOLOGY
(2022)
Article
Entomology
Jessica C. Lindenmayer, Mark Payton, Kris L. Giles, Norman C. Elliott, Allen E. Knutson, Robert Bowling, Nicholas J. Seiter, Brian McCornack, Sebe A. Brown, Tom A. Royer
Summary: The study evaluated different 2-leaf sampling units and found that two randomly selected leaves from the middle stratum were more accurate in estimating sugarcane aphid density. Some sampling units showed high variability in estimating aphid density across different growth stages, while the (L1+U1) sampling unit demonstrated good accuracy in assessing variation in aphid density.
JOURNAL OF ECONOMIC ENTOMOLOGY
(2021)
Article
Agronomy
Isaac L. Esquivel, Ashleigh M. Faris, Michael J. Brewer
Summary: The sugarcane aphid has recently become a costly pest of sorghum, due to its ability to overwinter in the southern sorghum-producing areas and be wind-aided in spreading to other regions. The pest can switch between hosts and reproduce relatively well on both, impacting the agroecosystem where sorghum and johnsongrass are present.
Article
Biotechnology & Applied Microbiology
Somashekhar M. Punnuri, Addissu G. Ayele, Karen R. Harris-Shultz, Joseph E. Knoll, Alisa W. Coffin, Haile K. Tadesse, J. Scott Armstrong, Trahmad K. Wiggins, Hanxia Li, Scott Sattler, Jason G. Wallace
Summary: This study identified genomic regions associated with sorghum aphid resistance through field evaluation and reflectance data analysis. Several common markers were found to be associated with aphid count and plant damage, and loci for reflectance-based traits were identified on different chromosomes. Genes related to sorghum growth and flowering time were also identified. The markers identified in this study will facilitate marker-assisted breeding for sorghum aphid resistance.
Article
Plant Sciences
Sowmya Poosapati, Elly Poretsky, Keini Dressano, Miguel Ruiz, Armando Vazquez, Evan Sandoval, Adelaida Estrada-Cardenas, Sarthak Duggal, Jia-Hui Lim, Geoffrey Morris, Adrianna Szczepaniec, Spencer S. Walse, Xinzhi Ni, Eric A. Schmelz, Alisa Huffaker
Summary: A WRKY transcription factor, SbWRKY86, identified through forward genetics, is associated with sorghum resistance to the sugarcane aphid and reduces aphid populations in multiple plant species when heterologously expressed. The expression of SbWRKY86 is associated with changes in gene expression related to carbon-nitrogen metabolism and callose deposition, both contributing to defense against aphids.
Article
Biochemistry & Molecular Biology
Shankar Pant, Yinghua Huang
Summary: The study demonstrates the involvement of H2O2 and antioxidant genes in host plant resistance to sugarcane aphid infestation in sorghum, with resistant genotypes showing elevated accumulation of H2O2 and stronger upregulation of antioxidant genes than susceptible genotypes. The findings suggest that these factors contribute to the enhanced resistance in some sorghum genotypes against sugarcane aphid, providing experimental evidence for the role of ROS in the early defensive response.
PLANT SIGNALING & BEHAVIOR
(2021)
Article
Environmental Sciences
Fallon Salinas, Carlos E. Astete, John H. Waldvogel, Sara Navarro, Jason C. White, Wade Elmer, Carlos Tamez, Jeffrey A. Davis, Cristina M. Sabliov
Summary: The research found that at low and medium doses, lignin-based nanoparticles and zein nanoparticles have minimal impact on soybean plant health, while at high concentrations, zein nanoparticles may cause oxidative stress reactions.
Article
Ecology
Srinivas K. Lanka, Bret D. Elderd, Jeffrey A. Davis, Michael J. Stout
Summary: This study found a negative correlation between constitutive resistance and induced resistance in soybean plants, indicating a trade-off between the two modes of resistance. Additional evidence for trade-offs between constitutive and inducible resistance was also found in the analysis of consumption data.
BASIC AND APPLIED ECOLOGY
(2021)
Article
Nanoscience & Nanotechnology
Timea Kacso, Eban A. Hanna, Fallon Salinas, Carlos E. Astete, Ede Bodoki, Radu Oprean, Paul P. Price, Vinson P. Doyle, Colin A. R. Bonser, Jeffrey A. Davis, Cristina M. Sabliov
Summary: This study synthesized zein nanoparticles and lignin-graft-poly(lactic-co-glycolic) acid nanoparticles using surfactants and applied them as antifungal seed treatments on soybeans. The results showed that the treated seeds had similar germination rates and plant health compared to the control group, indicating that these nanoparticles are safe and effective delivery systems for active compounds in seed treatments.
APPLIED NANOSCIENCE
(2022)
Article
Entomology
Scott T. Lee, Chaoyang Li, Jeffrey A. Davis
Summary: This study investigated the pest and natural enemy communities in Louisiana soybean fields, finding that pests mainly fed on soybean through piercing-sucking mouthparts, while predators were mainly spiders and big-eyed bugs. Both pest and predator populations were more abundant in the later stages of soybean reproductive period. There was a moderate positive linear relationship between pest and predator communities, indicating a temporal correlation.
Article
Entomology
Colin A. R. Bonser, Carlos E. Astete, Cristina M. Sabliov, Jeffrey A. Davis
Summary: Research shows that nanoparticles can be an effective tool for managing agricultural pests, but their unintended effects on insects should be evaluated before using them in agroecosystems. In this study, chronic parental and generational exposure to positively charged zein nanoparticles and methoxyfenozide-loaded zein nanoparticles were evaluated on Chrysodeixis includens. The study found that the nanoparticles had different effects on the insect's population dynamics, with the methoxyfenozide-loaded nanoparticles being more deleterious than the positively charged nanoparticles.
ENVIRONMENTAL ENTOMOLOGY
(2022)
Article
Entomology
J. Chen, X. Chen, M. J. Stout, J. A. Davis
Summary: Belowground herbivory can alter the abundance and behavior of plant virus vectors in sweetpotato. Understanding the mechanisms underlying these behavioral changes can improve integrated pest management of plant virus vectors.
JOURNAL OF ECONOMIC ENTOMOLOGY
(2022)
Article
Biochemistry & Molecular Biology
Flinn M. O'Hara, Jeffrey A. Davis, Daniel R. Swale
Summary: Toxicity bioassays and electrical penetration graph methodology were used to study the effects of commercial aphicides on the cotton aphid. Results showed that flupyradifurone was the most toxic aphicide and reduced the transmission of plant viruses by cotton aphids.
PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY
(2022)
Article
Entomology
Nathan C. Arey, Nathan P. Lord, Jeffrey A. Davis
Summary: The study results indicate that hemp may influence the population dynamics of soybean looper, fall armyworm, and beet armyworm in Louisiana agroecosystems.
JOURNAL OF ECONOMIC ENTOMOLOGY
(2022)
Article
Agronomy
Flinn M. O'Hara, Zhijun Liu, Jeffrey A. Davis, Daniel R. Swale
Summary: This study tested the antifeedant properties of two Kir channel inhibitors on cotton aphids and developed a method to enable systemic movement of these inhibitors in plant tissues by incorporating rubusoside. Results showed that this approach effectively reduced aphid feeding behavior and has the potential to be a novel control strategy for agricultural pests.
PEST MANAGEMENT SCIENCE
(2023)
Article
Entomology
Colin A. R. Bonser, Carlos E. Astete, Cristina M. Sabliov, Jeffrey A. Davis
Summary: Previous research found that positively charged zein nanoparticles were toxic to neonates of Anticarsia gemmatalis Hubner and other noctuid pests, but the specific mechanisms were unknown. This study ruled out the hypotheses that toxic effects were caused by surfactant charges and antifeedant capabilities. It also found that both (+)ZNP and its cationic surfactant DDAB decreased antioxidant levels in A. gemmatalis neonates, suggesting inhibition of antioxidant levels. These findings contribute to the understanding of potential modes of action of biopolymeric nanoparticles.
JOURNAL OF ECONOMIC ENTOMOLOGY
(2023)
Article
Entomology
C. A. R. Bonser, C. Tamez, J. C. White, C. E. Astete, C. M. Sabliov, J. A. Davis
Summary: Biopolymeric nanoparticles have the potential to improve insecticide efficacy through improved absorption, coverage, and permeability, while protecting the active ingredient and extending efficacy. The experiments showed that positively charged zein nanoparticles loaded with methoxyfenozide had comparable efficacy to a commercial product.
JOURNAL OF INSECT SCIENCE
(2023)
Article
Entomology
Scott T. Lee, Jeffrey A. Davis
Summary: The intensified use of neonicotinoids in agroecosystems has resulted in inadvertent consequences. The impact of neonicotinoid usage on nonpersistent virus transmission and efficacy against nontarget herbivores in soybean has not been addressed. This study evaluated the interaction between the neonicotinoid thiamethoxam and soybean variety and its impact on different pest feeding guilds. Results suggest that neonicotinoids like thiamethoxam may provide some benefit via insecticidal activity against nontarget defoliators.
JOURNAL OF ECONOMIC ENTOMOLOGY
(2023)
Article
Genetics & Heredity
Rodney N. Nagoshi, Jeffrey A. Davis, Robert L. Meagher, Fred R. Musser, Graham P. Head, Hector Portillo, Henry Teran
Summary: The soybean looper, an economically important pest of soybean, shows annual migrations from the southern regions of the United States to Canada. Similar to the fall armyworm, the soybean looper is projected to have similar permanent populations in North America. However, genetic markers and distribution patterns indicate substantial differences in migratory behavior between the two species, possibly due to differences in planting time of corn and soybean.
Article
Genetics & Heredity
Rodney N. Nagoshi, Jeffrey A. Davis, Robert L. Meagher, Fred R. Musser, Graham P. Head, Hector Portillo, Henry Teran
Summary: The soybean looper (Chrysodeixis includens) is a significant soybean pest in the southeastern United States, characterized by a broad host range, long-distance flight ability, and resistance to important pesticides. Population structure analysis revealed the existence of two strains of soybean looper, exhibiting genetic differences and reproductive barriers. These molecular markers will aid in studying the behaviors and mitigating the spread of resistance traits in these populations.
Article
Entomology
Nupur Sarkar, Mark J. Murray, Michael J. Stout, Jeffrey A. Davis
Summary: This study tested the impact of different sweetpotato cultivars on the developmental time, adult emergence, body length, weight, and supercooling point of the sweetpotato weevil. The results showed that the Murasaki cultivar exhibited strong resistance, with fewer but more cold-tolerant adults emerging.
FLORIDA ENTOMOLOGIST
(2022)
