Monitoring for Pyrethroid Resistance in Bollworm (Helicoverpa zea) Populations in Texas: Trends from 2003-2005

The purpose of this study was to assess the susceptibility of the bollworm, Helicoverpa zea (Boddie), to the pyrethroid cypermethrin in the primary crop production areas of Texas. Pyrethroid insecticides are widely used in cotton and in other production systems, such as grain sorghum and corn. The statewide monitoring program that evaluated resistance in male H. zea was conducted from April to September 2005, surveying nine Texas counties with a total of 5,041 moths from all areas used for analysis. Data from all areas were sent to Texas A&M University Toxicology Laboratory for analysis. Considerable variability in response to cypermethrin was detected in H. zea across the state. Based on LC50 data, the most resistant populations were from Nueces, Uvalde, and Williamson counties while the most susceptible populations were from Ellis, Fisher and Mitchell, Hockley, and Swisher counties. Accepted for publication 2 October 2006. Published 19 July 2007.

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Potential Impact of Pyrethroid Resistance in Helicoverpa zea to the Midwest Processing Industry: Sweet Corn and Snap Beans

Plant Health Progress ◽

10.1094/php-2007-0719-06-rv ◽

2007 ◽

Vol 8 (1) ◽

pp. 61 ◽

Cited By ~ 1

Author(s):

Brian R. Flood ◽

Thomas L. Rabaey

Keyword(s):

Helicoverpa Zea ◽

Sweet Corn ◽

Pyrethroid Resistance ◽

Corn Earworm ◽

Pyrethroid Insecticides ◽

Snap Beans ◽

Early Instar ◽

Production Areas ◽

Treatment Window

Midwest food processors are well positioned to avoid major crop losses, and product contamination resulting from pyrethroid resistance in corn earworm (CEW), Helicoverpa zea (Boddie). However, we do recognize risks associated with late-season plantings, particularly for sweet corn and snap beans. CEW usually migrate into the production areas by late July to mid-August. Crops at risk for most Midwest locations primarily include sweet corn planted after 10 June and snap beans planted after 10 July (about 25% of the Midwest acreage). Pyrethroid insecticides continue to be the commercial standard, with alternative chemistries either ineffective or more expensive. The CEW “treatment window” for sweet corn is from row tassel to dark brown silk and, for snap beans, from bloom to 10 days before harvest. In sweet corn, CEW is only vulnerable as an adult, egg, or early instar feeding on the silk. If left untreated, or with insecticide failure, we anticipate a loss of about one square inch of kernels per larva (2 cases/ton of final cut-corn product). The loss of kernels and the creation of black kernels from contamination associated with feeding injury are estimated to have a market cost in excess of $100/acre, or $6 million for Midwest sweet corn and snap beans. We currently have no effective alternative insecticides for CEW for either crop. In the short term, processors will likely use higher rates of pyrethroids, shorter intervals, and/or additional treatments. Long term, we will increasingly rely on a “process-out” approach to husk out, wash out, and vision-sort larval contaminants and damaged kernels. Accepted for publication 23 February 2007. Published 19 July 2007.

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Monitoring Pyrethroid Resistance in Bollworm (Lepidoptera: Noctuidae) Moths in Missouri, 1988 to 1994

Journal of Entomological Science ◽

10.18474/0749-8004-33.3.300 ◽

1998 ◽

Vol 33 (3) ◽

pp. 300-312 ◽

Cited By ~ 2

Author(s):

Clyde E. Sorenson ◽

Alan Schreiber ◽

Howard G. Townsend ◽

Samir F. Abd-Elghafar ◽

Mahlon L. Fairchild ◽

...

Keyword(s):

Long Range ◽

Helicoverpa Zea ◽

Pyrethroid Resistance ◽

Pheromone Traps ◽

Pyrethroid Insecticides ◽

Resistance Monitoring ◽

Number Of Individuals ◽

Lepidoptera Noctuidae

From 1988 to 1994, adult vial bioassays were conducted on bollworms, Helicoverpa zea (Boddie), collected from pheromone traps in Missouri to determine their susceptibility to pyrethroids. Although most moths were susceptible to cypermethrin, many assays contained individuals that survived concentrations of 5 and 10 μg per vial. The number of individuals that survived these concentrations increased each of the first 3 yrs, and then fluctuated from year to year. In some cases, moths with increased tolerance to cypermethrin occurred in locations where little or no pyrethroid insecticides were used for bollworm control. A likely explanation for tolerant bollworms in Missouri is immigration from more southerly locations, and evidence for long range dispersal of these insects is presented. Implications for regional resistance monitoring also are discussed.

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Semi-Transparent Organic Photovoltaics Applied as Greenhouse Shade for Spring and Summer Tomato Production in Arid Climate

Agronomy ◽

10.3390/agronomy11061152 ◽

2021 ◽

Vol 11 (6) ◽

pp. 1152

Author(s):

Rebekah Waller ◽

Murat Kacira ◽

Esther Magadley ◽

Meir Teitel ◽

Ibrahim Yehia

Keyword(s):

Solar Radiation ◽

Organic Photovoltaics ◽

Crop Production ◽

Production Systems ◽

High Light ◽

Growth And Yield ◽

Control Group ◽

Tomato Crop ◽

Tomato Production ◽

Control Section

Recognizing the growing interest in the application of organic photovoltaics (OPVs) with greenhouse crop production systems, in this study we used flexible, roll-to-roll printed, semi-transparent OPV arrays as a roof shade for a greenhouse hydroponic tomato production system during a spring and summer production season in the arid southwestern U.S. The wavelength-selective OPV arrays were installed in a contiguous area on a section of the greenhouse roof, decreasing the transmittance of all solar radiation wavelengths and photosynthetically active radiation (PAR) wavelengths (400–700 nm) to the OPV-shaded area by approximately 40% and 37%, respectively. Microclimate conditions and tomato crop growth and yield parameters were measured in both the OPV-shaded (‘OPV’) and non-OPV-shaded (‘Control’) sections of the greenhouse. The OPV shade stabilized the canopy temperature during midday periods with the highest solar radiation intensities, performing the function of a conventional shading method. Although delayed fruit development and ripening in the OPV section resulted in lower total yields compared to the Control section (24.6 kg m−2 and 27.7 kg m−2, respectively), after the fourth (of 10 total) harvests, the average weekly yield, fruit number, and fruit mass were not significantly different between the treatment (OPV-shaded) and control group. Light use efficiency (LUE), defined as the ratio of total fruit yield to accumulated PAR received by the plant canopy, was nearly twice as high as the Control section, with 21.4 g of fruit per mole of PAR for plants in the OPV-covered section compared to 10.1 g in the Control section. Overall, this study demonstrated that the use of semi-transparent OPVs as a seasonal shade element for greenhouse production in a high-light region is feasible. However, a higher transmission of PAR and greater OPV device efficiency and durability could make OPV shades more economically viable, providing a desirable solution for co-located greenhouse crop production and renewable energy generation in hot and high-light intensity regions.

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Precision agriculture and geospatial techniques for sustainable disease control

Indian Phytopathology ◽

10.1007/s42360-021-00334-2 ◽

2021 ◽

Author(s):

Daniel P. Roberts ◽

Nicholas M. Short ◽

James Sill ◽

Dilip K. Lakshman ◽

Xiaojia Hu ◽

...

Keyword(s):

Big Data ◽

Disease Control ◽

Crop Production ◽

Plant Disease ◽

Production Systems ◽

Cropping Systems ◽

Data Driven ◽

Agricultural Community ◽

Plant Disease Control ◽

Crop Germplasm

AbstractThe agricultural community is confronted with dual challenges; increasing production of nutritionally dense food and decreasing the impacts of these crop production systems on the land, water, and climate. Control of plant pathogens will figure prominently in meeting these challenges as plant diseases cause significant yield and economic losses to crops responsible for feeding a large portion of the world population. New approaches and technologies to enhance sustainability of crop production systems and, importantly, plant disease control need to be developed and adopted. By leveraging advanced geoinformatic techniques, advances in computing and sensing infrastructure (e.g., cloud-based, big data-driven applications) will aid in the monitoring and management of pesticides and biologicals, such as cover crops and beneficial microbes, to reduce the impact of plant disease control and cropping systems on the environment. This includes geospatial tools being developed to aid the farmer in managing cropping system and disease management strategies that are more sustainable but increasingly complex. Geoinformatics and cloud-based, big data-driven applications are also being enlisted to speed up crop germplasm improvement; crop germplasm that has enhanced tolerance to pathogens and abiotic stress and is in tune with different cropping systems and environmental conditions is needed. Finally, advanced geoinformatic techniques and advances in computing infrastructure allow a more collaborative framework amongst scientists, policymakers, and the agricultural community to speed the development, transfer, and adoption of these sustainable technologies.

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Effects of cereal rye seeding rate on waterhemp (Amaranthus tuberculatus) emergence and soybean growth and yield

Weed Technology ◽

10.1017/wet.2021.28 ◽

2021 ◽

pp. 1-25

Author(s):

Mandy Bish ◽

Brian Dintelmann ◽

Eric Oseland ◽

Jacob Vaughn ◽

Kevin Bradley

Keyword(s):

Crop Production ◽

Production Systems ◽

Soil Seed Bank ◽

Linear Regression Analysis ◽

Growth And Yield ◽

Seeding Rate ◽

Early Season ◽

Cereal Rye ◽

Herbicide Resistant ◽

Growing Seasons

Abstract The evolution of herbicide-resistant weeds has resulted in the necessity to integrate non-chemical control methods with chemicals for effective management in crop production systems. In soybean, control of the pigweed species, particularly herbicide-resistant waterhemp and Palmer amaranth, have become predominant concerns. Cereal rye planted as a winter cover crop can effectively suppress early-season weed emergence in soybean, including waterhemp, when planted at a rate of 123 kg ha−1. The objectives of this study were to determine the effects of different cereal rye seeding rates (0, 34, 56, 79, 110, and 123 kg ha−1) on early-season waterhemp suppression and soybean growth and yield. Soybean was planted into fall-seeded cereal rye, which was terminated within four days of soybean planting. The experiment was conducted over the 2018, 2019, and 2020 growing seasons in Columbia, Missouri. Effects of cereal rye on early-season waterhemp suppression varied by year and were most consistent at 56 kg ha−1 or higher seeding rates. Linear regression analysis of cereal rye biomass, height, or stand at soybean planting showed inverse relationships with waterhemp emergence. No adverse effects to soybean growth or yield were observed at any of the cereal rye seeding rates relative to plots that lacked cereal rye cover. Result differences among the years suggest that the successfulness of cereal rye on suppression of early-season waterhemp emergence is likely influenced by the amount of waterhemp seed present in the soil seed bank.

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Revisiting Sulphur—The Once Neglected Nutrient: It’s Roles in Plant Growth, Metabolism, Stress Tolerance and Crop Production

Agriculture ◽

10.3390/agriculture11070626 ◽

2021 ◽

Vol 11 (7) ◽

pp. 626

Author(s):

Tinashe Zenda ◽

Songtao Liu ◽

Anyi Dong ◽

Huijun Duan

Keyword(s):

Plant Growth ◽

Abiotic Stresses ◽

Crop Production ◽

Production Systems ◽

Crop Productivity ◽

Plant Phenotyping ◽

Special Importance ◽

Nutrient Deficiencies ◽

Sulphur Nutrition ◽

Physiological Processes

Sulphur plays crucial roles in plant growth and development, with its functions ranging from being a structural constituent of macro-biomolecules to modulating several physiological processes and tolerance to abiotic stresses. In spite of these numerous sulphur roles being well acknowledged, agriculture has paid scant regard for sulphur nutrition, until only recently. Serious problems related to soil sulphur deficiencies have emerged and the intensification of food, fiber, and animal production is escalating to feed the ever-increasing human population. In the wake of huge demand for high quality cereal and vegetable diets, sulphur can play a key role in augmenting the production, productivity, and quality of crops. Additionally, in light of the emerging problems of soil fertility exhaustion and climate change-exacerbated environmental stresses, sulphur assumes special importance in crop production, particularly under intensively cropped areas. Here, citing several relevant examples, we highlight, in addition to its plant biological and metabolism functions, how sulphur can significantly enhance crop productivity and quality, as well as acclimation to abiotic stresses. By this appraisal, we also aim to stimulate readers interests in crop sulphur research by providing priorities for future pursuance, including bettering our understanding of the molecular processes and dynamics of sulphur availability and utilization in plants, dissecting the role of soil rhizospherical microbes in plant sulphur transformations, enhancing plant phenotyping and diagnosis for nutrient deficiencies, and matching site-specific crop sulphur demands with fertilizer amendments in order to reduce nutrient use inefficiencies in both crop and livestock production systems. This will facilitate the proper utilization of sulphur in crop production and eventually enhance sustainable and environmentally friend food production.

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iHSD Mill Efficacy on the Seeds of Australian Cropping System Weeds

Weed Technology ◽

10.1017/wet.2017.95 ◽

2017 ◽

Vol 32 (2) ◽

pp. 103-108 ◽

Cited By ~ 6

Author(s):

Michael J. Walsh ◽

John C. Broster ◽

Stephen B. Powles

Keyword(s):

Moisture Content ◽

Crop Production ◽

Production Systems ◽

Cropping Systems ◽

Cropping System ◽

High Efficacy ◽

Weed Seed ◽

Rigid Ryegrass ◽

Mill Speed ◽

Wheat Chaff

AbstractIn Australia, widespread evolution of multi-resistant weed populations has driven the development and adoption of harvest weed seed control (HWSC). However, due to incompatibility of commonly used HWSC systems with highly productive conservation cropping systems, better HWSC systems are in demand. This study aimed to evaluate the efficacy of the integrated Harrington Seed Destructor (iHSD) mill on the seeds of Australia’s major crop weeds during wheat chaff processing. Also examined were the impacts of chaff type and moisture content on weed seed destruction efficacy. Initially, the iHSD mill speed of 3,000 rpm was identified as the most effective at destroying rigid ryegrass seeds present in wheat chaff. Subsequent testing determined that the iHSD mill was highly effective (>95% seed kill) on all Australian crop weeds examined. Rigid ryegrass seed kill was found to be highest for lupin chaff and lowest in barley, with wheat and canola chaff intermediate. Similarly, wheat chaff moisture reduced rigid ryegrass seed kill when moisture level exceeded 12%. The broad potential of the iHSD mill was evident, in that the reductions in efficacy due to wide-ranging differences in chaff type and moisture content were relatively small (≤10%). The results from these studies confirm the high efficacy and widespread suitability of the iHSD for use in Australian crop production systems. Additionally, as this system allows the conservation of all harvest residues, it is the best HWSC technique for conservation cropping systems.

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An Old Pest, a New Solution

Outlook on Agriculture ◽

10.5367/000000005774378793 ◽

2005 ◽

Vol 34 (3) ◽

pp. 181-187 ◽

Cited By ~ 5

Author(s):

Alan Cork ◽

Malcolm J. Iles ◽

Nazira Q. Kamal ◽

J.C. Saha Choudhury ◽

M. Mahbub Rahman ◽

...

Keyword(s):

Crop Production ◽

Production Systems ◽

Insect Pests ◽

Cropping System ◽

Environmentally Benign ◽

Mass Trapping ◽

Economic Returns ◽

Collaborative Project ◽

Field School ◽

High Yielding Varieties

Bangladesh is essentially self-sufficient in rice as a result of the successful adoption of new high-yielding varieties and irrigated summer production over traditional deep-water cultivation practices. The sustainability of the cropping system depends on farmers adopting integrated pest management (IPM) practices in preference to relying solely on insecticides for pest and disease control. Yet insecticide consumption in rice is increasing, in common with other crop-production systems in Bangladesh. It is probably only the poor economic returns from rice cultivation that prevent more widespread use of pesticides. Enlightened agrochemical companies such as Syngenta Bangladesh Limited have recognized that insecticide use in rice should be discouraged, and promote IPM options through their farmer field school (FFS) programme. This paper describes the results of a collaborative project to assist Syngenta to develop and incorporate mass trapping with sex pheromones into their FFS programme as an environmentally benign method of controlling the predominant insect pests of rice, stem borers.

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Russian Thistle (Salsola iberica) and Kochia (Kochia scoparia) Control in Dryland Corn (Zea mays)

Weed Technology ◽

10.1017/s0890037x00026117 ◽

1990 ◽

Vol 4 (3) ◽

pp. 631-634 ◽

Cited By ~ 4

Author(s):

R. E. Blackshaw

Keyword(s):

Zea Mays ◽

Weed Control ◽

Crop Production ◽

Production Systems ◽

Cropping System ◽

Field Studies ◽

Kochia Scoparia ◽

Field Corn ◽

Salsola Iberica

Field studies were conducted in 1987, 1988, and 1989 at Lethbridge, Alberta to determine suitable herbicides for the control of Russian thistle and kochia in field corn grown in a dryland cropping system. Soil-applied atrazine or cyanazine provided inconsistent control of these weeds under dryland conditions. Combining inter-row tillage or 2,4-D applied postemergence with soil-applied atrazine improved the consistency of weed control over years. Postemergence atrazine and dicamba plus 2,4-D controlled Russian thistle and kochia in all years. Corn yields reflected the level of weed control attained with each treatment. The suitability of the various treatments for weed control in corn grown under dryland crop production systems is discussed.

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