Article
Environmental Sciences
Rashmi Pandey, Shafia Siddiqui, Sharad Saurabh, Aditya Pankaj, Pradhyumna Kumar Singh, Devendra Parmar, Shiv Singh, Manisha Mishra
Summary: The study found that carbon nanoparticles derived from waste-candle soot have toxic effects on Helicoverpa armigera, leading to reduced larval weight, increased levels of antioxidant enzymes, decreased egg-laying capacity of moths, and reduced egg hatchability. Compared to commercially available multi-walled carbon nanotubes, the entomotoxic effects of carbon nanoparticles on H. armigera were more pronounced, ultimately resulting in the complete cessation of the pest population.
Article
Entomology
Zhuo Li, Ming Zhao, Lei Li, Yi-Yang Yuan, Fa-Jun Chen, Megha N. Parajulee, Feng Ge
Summary: The inoculation of Azotobacter had negative effects on the development and food utilization of Helicoverpa armigera fed on Bt cotton, leading to enhanced resistance against the target pest. Furthermore, Azotobacter inoculation stimulated plant soil nitrogen uptake, increased nitrogen metabolism-related compounds, and promoted plant growth for both Bt and non-Bt cotton, simultaneously raising Bt protein expression and enhancing resistance efficacy against cotton bollworm in Bt cotton.
Article
Entomology
Yong Wang, Yajun Chang, Sai Zhang, Xingchuan Jiang, Bin Yang, Guirong Wang
Summary: This study investigated the use of light traps for controlling the fall armyworm. Experiments were conducted to measure the phototactic responses of the fall armyworm and cotton bollworm to blue light. The results showed that blue light had the highest attractivity to the fall armyworm. Based on these findings, a proposal to use blue light for controlling the fall armyworm was made.
Article
Agronomy
Shuai Liu, Bin Li, Wei Liu, Yang Liu, Bingzhong Ren, Guirong Wang
Summary: In this study, the functional role of SPR in female post-mating behaviors was detailedly demonstrated in Helicoverpa armigera, an economically important pest worldwide. The findings suggest that HarmSPR mediates long-term sexual receptivity in females and affects oviposition and female longevity, which could potentially be utilized in developing pest control strategies.
PEST MANAGEMENT SCIENCE
(2021)
Article
Entomology
Nazanin Atashi, Parviz Shishehbor, Ali Asghar Seraj, Arash Rasekh, Seyed Ali Hemmati, Eric W. Riddick
Summary: The study evaluated the potential of Trichogramma euproctidis to parasitize Helicoverpa armigera eggs of different ages, showing that young eggs were optimal for the development and reproduction of T. euproctidis. It was the first time documented that T. euproctidis can utilize H. armigera as a rearing host, and using young host eggs could ensure the persistence of a T. euproctidis mass production system.
Article
Biochemistry & Molecular Biology
Yan-Xue Li, Di Wang, Wen-Li Zhao, Jun-Ying Zhang, Xin-Le Kang, Yan-Li Li, Xiao-Fan Zhao
Summary: This study reveals that phosphorylation of Met1 protein at Thr393 by JH is crucial for promoting its binding to JHRE to regulate Kr-h1 transcription, and plays a key role in preventing Met1-Met1 association.
INSECT BIOCHEMISTRY AND MOLECULAR BIOLOGY
(2021)
Article
Agronomy
Snehel Chakravarty, C. P. Srivastava, Ram Keval
Summary: This study comprehensively presents the biological and reproductive demographic traits of different geographic populations of Helicoverpa armigera in India. The study found variations in developmental period, survival and reproduction, and growth and fitness indices among populations. The Cooch Behar population had the longest developmental period, while populations from the South Zone had the shortest duration to complete their life cycle. Significant differences were observed for reproductive competence and relative growth and fitness indices, with the Varanasi population showing the highest values. Cluster analysis identified two distinct groups among the studied populations, indicating probable genetic heterogeneity in Indian populations of Helicoverpa armigera.
Article
Entomology
Khethani Vincent Mawela, Rami Kfir, Kerstin Kruger
Summary: The study investigated the potential of Trichogrammatoidea lutea as a biological control agent of Helicoverpa armigera by examining its longevity, daily parasitism, fecundity, number of progeny per egg and sex ratio with regard to maternal age in laboratory conditions. The research found that T. lutea exhibited a female-biased sex ratio during the first few days and a male-biased ratio from day 4 to day 14, with a overall sex ratio of approximately 1:1. The findings suggest that T. lutea has great potential as a biological control agent for H. armigera.
BULLETIN OF INSECTOLOGY
(2021)
Article
Agronomy
Muhammad Shahbaz Asghar, Zahid Mahmood Sarwar, Abdulrahman A. Almadiy, Ashwag Shami, Rania Ali El Hadi Mohamed, Nazeer Ahmed, Minakshi Sanjay Waghulade, Pravej Alam, Fahd Mohammed Abd Al Galil
Summary: American bollworm, as a notorious pest, has developed resistance to synthetic insecticides due to widespread and repeated use. In this study, the efficacy of green synthesized nanoparticles and silver and zinc oxide nanoparticles at different concentrations were evaluated against the larvae. The results showed that nanoparticles had a high mortality rate on the larvae and affected the demographic parameters of the population. This technique has significant value in integrated pest management.
Article
Entomology
Wei He, Xincheng Zhao, Abid Ali, Shishuai Ge, Haowen Zhang, Limei He, Kongming Wu
Summary: Monitoring the adult populations of the agricultural pest Helicoverpa armigera using food attractants can predict the population dynamics and reproductive development. Trapped adults showed generational changes and differences in reproductive development among months. This approach provides a new way to forecast the population dynamics of this pest.
JOURNAL OF ECONOMIC ENTOMOLOGY
(2021)
Article
Entomology
Fariba Habibi, Azam Mikani, Mohammad Mehrabadi, Maged Mohamed Ali Fouda
Summary: Recently, it has been found that neuropeptide F2 (NPF2) can increase food consumption and body weight in cotton bollworms. This study examined the effects of NPF2 on the reproductive system of adult female cotton bollworms. NPF2 injections increased oocyte size, ecdysteroid levels, and the expression of certain genes related to reproduction, leading to increased fecundity and fertility. Knockdown of the NPF2 gene had opposing effects. Overall, these findings demonstrate the regulatory role of NPF2 in female reproduction of cotton bollworms.
PHYSIOLOGICAL ENTOMOLOGY
(2023)
Article
Entomology
Qamar Saeed, Faheem Ahmad, Numan Yousaf, Haider Ali, Syed Azhar Ali Shah Tirmazi, Abdulrahman Alshammari, Naeema Kausar, Mahmood Ahmed, Muhammad Imran, Muhammad Jamshed, Metab Alharbi, Muhammad Muddassar
Summary: The cotton bollworm is a significant pest that causes damage to crops and vegetables. Traditional chemical pesticides cannot effectively control this pest due to its high fertility and short generation time. Researchers have discovered small molecules that disrupt insect molting, reducing the weight accumulations and fertility of cotton bollworm. Additionally, by inhibiting the function of sterol carrier protein, the life table parameters of cotton bollworm can be significantly reduced. These findings provide important insights for developing effective and sustainable chemical treatments.
Article
Agronomy
Wanna Zhang, Long Ma, Xiangya Liu, Yingchuan Peng, Gemei Liang, Haijun Xiao
Summary: The study found that sublethal doses of MF have severe adverse effects on the development of Helicoverpa armigera, including ecdysis failure, prolonged larval duration, and decreased pupal weight. Additionally, MF inhibits ecdysteroidogenesis at sublethal doses, but induces the expression of 20-hydroxyecdysone (20E) response genes, including HaFTZ-F1.
PEST MANAGEMENT SCIENCE
(2021)
Article
Entomology
Pradeep Kumar Dalal, Ramesh Arora
Summary: The study found that different alternating temperatures have an impact on the growth of Helicoverpa armigera on tomato crops, with higher temperatures favoring increased oviposition and higher intrinsic and finite rates of increase. Overall, a continuous increase in temperature is beneficial for shortening the immature period and generation time.
INTERNATIONAL JOURNAL OF TROPICAL INSECT SCIENCE
(2021)
Article
Biology
Samuel A. Bawa, Peter C. Gregg, Alice P. Del Socorro, Cara Miller, Nigel R. Andrew
Summary: The study demonstrates that heat stress on pupae can significantly impact population dynamics by reducing fecundity, extending the pre-oviposition period, and affecting adult development. Both prolonged and repeated heat-stress treatments resulted in longer emergence time and extended lifespan in adults, while significantly decreasing female fecundity. It is crucial to assess cross-generational responses to extreme heat stress, as heat exposure on the parent generation can lead to issues in offspring production.
JOURNAL OF THERMAL BIOLOGY
(2021)
Article
Agronomy
Talent Namatsheve, Remi Cardinael, Regis Chikowo, Marc Corbeels, Joyful Tatenda Rugare, Stanford Mabasa, Aude Ripoche
Summary: Weeds pose a significant threat to crop growth in low-input cropping systems in sub-Saharan Africa. The study found that planting sole cowpea can effectively reduce weed infestation, while having little impact on maize yield.
Article
Agronomy
Jens G. Froese, Justine V. Murray, Nicholas J. Beeton, Rieks D. van Klinken
Summary: This article introduces a generic Bayesian network model called PRReSTo, which estimates likely infestation rates of host items in consignments. PRReSTo takes into account the vulnerability of host items to pest infestation, the abundance of pests to which host items are exposed, and the effects of risk-reducing measures. PRReSTo can be used to evaluate the effectiveness and acceptability of risk reduction measures in different pest-host systems.
Article
Agronomy
Alexis Delaplace, Mathieu Coulis, Gwenaelle Cottin, Philippe Tixier
Summary: This study compares the effectiveness of two fallow trapping patterns and finds that internal trapping of fallow land can clean up plots twice as quickly as trapping surrounding the fallow land. Additionally, trapping efficiency is influenced by climatic conditions, with the wet season being more favorable for trapping than the dry season.
Article
Agronomy
Todd E. Shelly, Kevin R. Cloonan
Summary: Invasive tephritid fruit flies pose a significant threat to commercial fruit and vegetable production. Early detection is crucial, and male lures are an important component of trapping networks. This review aims to summarize data on the change in attractiveness of male lures during aging in the field, highlighting studies that relate trap captures to changes in residual content and release rate.
Article
Agronomy
M. F. Lombardo, S. Panebianco, A. Azzaro, G. Timpanaro, G. Polizzi, G. Cirvilleri
Summary: Colletotrichum and Alternaria species have become emerging fungal pathogens causing severe economic losses in citrus orchards in the Mediterranean area. The use of copper-based antimicrobials for disease management is increasingly problematic, and research for alternative formulations is encouraged. This study tested copper-alternative products on citrus orchards and found that they significantly reduced disease incidence and severity, often showing comparable or better efficacy than copper. The good efficacy of these products suggests their potential for sustainable and large-scale use in integrated and organic citriculture.
Article
Agronomy
Innocent L. Rakubu, Agil Katumanyane, Brett P. Hurley
Summary: This study investigated the host-foraging strategies of five EPN species in South Africa and found that four of them exhibited a positive response to the presence of the host and caused 100% mortality, while the other species had a lower infection rate.
Article
Agronomy
Yuli Dai, Lin Gan, Xiaofei Liu, Chengzhong Lan, Zhiqiang Li, Xiujuan Yang
Summary: This study reports the occurrence of leaf spot disease caused by Colletotrichum plurivorum on cowpea plants in Pingnan prefecture, Fujian Province, China. The pathogen was identified based on morphological features and gene sequencing. Pathogenicity tests confirmed that the isolates of C. plurivorum could infect healthy cowpea leaves and induce leaf spot symptoms.
Article
Agronomy
Wenqing Xu, Weikai Li
Summary: Crop pests and diseases have a significant impact on crop yield and food security. This paper proposes FRseNet, a model based on ResNet-50 and SENet, for recognizing various crop pests and diseases. Experimental results on a self-constructed dataset demonstrate the competitive performance of the model in recognizing 15 diseases and 21 medium insect pests.
Article
Agronomy
Hector Carcamo, Carolyn Herle, Timothy Schwinghamer, Samuel Robinson, Patty Reid, R. Keith Gabert, Tyler Wist, Breanne Tidemann, Alejandro C. Costamagna
Summary: This study updated the economic thresholds for Lygus spp., a major insect pest of canola in Canada, by integrating a large data set collected over 23 years. The results revealed that the economic injury level for Lygus was around 9-23 insects per 10 sweeps, while spraying a foliar insecticide was only necessary when Lygus catches exceeded 30 insects per 10 sweeps. Additionally, analysis of Precision Yield Data showed that at low abundances (under 17 insects per 10 sweeps), Lygus may potentially stimulate canola yield and do not require control action.
Article
Agronomy
Medetissi Adom, Ken O. Fening, Maxwell K. Billah, Pascal O. Aigbedion-Atalor, David D. Wilson
Summary: Chilli pepper is an important food and cash crop in Ghana, but its production and marketing are hindered by insect pests. This study evaluated the efficacy of five different biopesticides against major chilli pepper pests and found that Neemazal and Attack were more effective than the other three in controlling these pests.
Article
Agronomy
Fariba Ghaderi, Soraya Karami
Summary: This study identified Phytophthora species causing root and crown rot in the main sesame-producing regions of Iran. The most aggressive species was found to be P. nicotianae. Additionally, sesame cultivars with high resistance to P. nicotianae and P. megasperma were identified. This is the first report of P. megasperma infection in sesame worldwide.
Article
Agronomy
Caroline Izabel R. Sakuno, Fabricio Jose B. Francischini, Karen Missy A. Komada, Murilo Basso, Fangneng Huang
Summary: The giant borer, Telchin licus, is a significant pest of sugarcane in Central and South America, and traditional control methods are ineffective due to the larvae's hiding behavior. Recent research has shown that transgenic sugarcane expressing Bacillus thuringiensis proteins, originally developed to control another sugarcane pest, can also effectively control the giant borer.
Article
Agronomy
Lucas de Paulo Arcanjo, Poliana Silvestre Pereira, Juliana Lopes dos Santos, Kayo Heberth de Brito Reis, Allana Grecco Guedes, Damaris Rosa de Freitas, Mikaelison da Silva Lima, Mayara Cristina Lopes, Renato Almeida Sarmento, Marcelo Coutinho Picanco
Summary: This study developed a standardized sampling plan for scouting B. tabaci adults in tropical soybean fields and identified the appropriate sample unit and sampling technique. A total of 49 samples per field were required, and the sampling process lasted no more than 5 min per hectare with associated costs not exceeding US$ 0.74 per hectare.
Article
Agronomy
Vicente Bezerra Pontes Junior, Levi Andres Bonilla Rave, Adalin Moraes Cezar de Aguiar, Alessandro da Costa Lima, Ana Flavia Souza Laube, Leonardo D'Antonino, Antonio Alberto da Silva
Summary: This study aimed to investigate the influence of diuron's adsorption characteristics in soil on dose determination. The results showed that organic matter content was a key factor in determining diuron's sorption and toxicity to E. indica.
Article
Agronomy
Lu Xun, Emilio Gil
Summary: A novel methodology was proposed to analyze water-sensitive papers (WSPs) for evaluating spray quality. The segmentation of overlapping droplets based on concave point detection and ellipse fitting achieved high accuracy. A linear relationship between droplet density and coverage was observed, and simulated WSPs were generated for high coverage estimation. This approach allows for more accurate spray quality indicators from WSP collectors.