All Publications for Frank Peairs

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2012 Colorado field crop insect management research and demonstration trials., Frank B Peairs,Jeff B Rudolph,Terri L Randolph

Agronomic & entomological results from 7 years of dryland cropping systems research at Briggsdale, Colorado. , Frank B Peairs,Neil Charles Hansen,David Poss,Dwayne G Westfall,Gary A Peterson,Justin Herman,Tim Shaver,Terri L Randolph,Jeff B Rudolph

Spider fauna of semiarid eastern Colorado agroecosystems: diversity, abundance, and effects of crop intensification, Lauren Kerzicnik,Frank B Peairs,Paula Cushing,Michael Draney,Scott Merrill

Sustainable dryland agroecosystems management. , Neil Charles Hansen,Lucretia Sherrod,Gary A Peterson,Dwayne G Westfall,Frank B Peairs,David Poss,Tim Shaver,Kevin Larson,Dennis Thompson,Laj Ahuja

The distribution of European corn borer (Lepidoptera: Crambidae) moths in pivot-irrigated corn., Scott Merrill,Shawn Walter,Frank B Peairs,Erica Schliep

Survey of Wheat Stem Sawfly (Hymenoptera: Cephidae) Infesting Wheat in Eastern Colorado, Darren Matthew Cockrell,Terri L Randolph,Erika Sasha Peirce,Frank B Peairs

Effects of Landscape Composition on Wheat Stem Sawfly (Hymenoptera: Cephidae) and Its Associated Braconid Parasitoids, Erika Sasha Peirce,Tatyana A Rand,Darren Matthew Cockrell,Paul James Ode,Frank B Peairs

Differential stem proteomics and metabolomics profiles for four wheat cultivars in response to the insect pest Wheat Stem Sawfly, Florent Didier Lavergne,Corey D Broeckling,Kitty J Brown,Darren Matthew Cockrell,Scott D Haley,Frank B Peairs,Stephen P Pearce,Lisa M Wolfe,Courtney Elaine Jahn,Adam L Heuberger

Damage and Yield Response of Wheat Lines with Dn4 and Dn7 Genes Resistant to Russian Wheat Aphid Biotype RWA21, Darren Matthew Cockrell,Terri L Randolph,Cynthia B Walker,Rachael Altschuler Sitz,Scott D Haley,Frank B Peairs

2016 Colorado field crop insect management research and demonstration trials, Frank B Peairs,D. Cockrell,J. B. Rudolph,L. Newhard.

2017 Colorado field crop insect management research and demonstration trials. , Frank B Peairs,D. Cockrell,J. B. Rudolph,L. Newhard.

Accessing a Russian wheat aphid resistance gene in bread wheat by long-read technologies. , Z. Tulpová,H. Toegelová,N. Lapitan,Frank B Peairs,J. Macas,P. Novak,A. Lukaszewski,D. Kopecky,M. Mazácová,J. Vrana,K. Holušová,P. Leroy,J. Dolezel,H. Šimková.

Insecticide resistance in alfalfa weevil and related implications in other alfalfa insect pests. , M. D. Rethwisch,Frank B Peairs,J. Pierce,A. Mostafa,S. Price,R. Ramirez,S. Rondon,S. Schell,J. Vardiman,D. B. Walsh,K. Wanner,E. Wenninger

Invasive cereal aphids of North America: ecology and pest management. , M. J. Brewer,Frank B Peairs,N. C. Elliott.

Temperature Limits for the Brown Wheat Mite, in Colorado, Rachael Altschuler Sitz,Erika Sasha Peirce,Emily Katrin Luna,Darren Matthew Cockrell,Laura Jean Newhard,Frank B Peairs

Wheat stem sawfly in Colorado, Frank B Peairs

Temperature limits for the brown wheat mite, in Colorado. , R. A. Sitz,E. S. Peirce,E. K. Luna,D. M. Cockrell,L. Newhard,Frank B Peairs

Colorado Ticks and Tick-borne Diseases, Whitney S Cranshaw,Frank B Peairs,Boris C Kondratieff

Accessing a Russian wheat aphid resistance gene in bread wheat by long-read technologies. , Z. Tulpová,H. Toegelová,N. Lapitan,Frank B Peairs,J. Macas,P. Novak,A. Lukaszewski,D. Kopecky,M. Mazácová,J. Vrana,K. Holušová,P. Leroy,J. Dolezel,H. Šimková.

GC-MS metabolomics to evaluate the composition of plant cuticular waxes for four Triticum aestivum cultivars., F. D. Lavergne,C. D. Broeckling,D. M. Cockrell,S. D. Haley,Frank B Peairs,C. E. Jahn,A. L. Heuberger.

Registration of 'Avery' wheat. , Scott D Haley,Jerry J Johnson,Frank B Peairs

Registration of 'Langin' wheat. , Scott D Haley,Jerry J Johnson,Frank B Peairs

GC-MS Metabolomics to Evaluate the Composition of Plant Cuticular Waxes for Four Triticum aestivum Cultivars, Florent Didier Lavergne,Corey D Broeckling,Darren Matthew Cockrell,Scott D Haley,Frank B Peairs,Courtney Elaine Jahn,Adam L Heuberger

Development of integrated pest management approaches for Russian wheat aphid in Colorado, USA. , Frank B Peairs

Host Plants of the Wheat Stem Sawfly (Hymenoptera: Cephidae), Darren Matthew Cockrell,Robert J Griffin-Nolan,Tatyana A Rand,Nuha Altilmisani,Paul James Ode,Frank B Peairs

Host plants of the wheat stem sawfly (Hymenoptera: Cephidae). , Darren Matthew Cockrell,Robert J Griffin-Nolan,Tatyana A Rand,N. Altilmisani,Paul James Ode,Frank B Peairs

TR17-4: Making Better Decisions, 2017 Colorado Winter Wheat Variety Performance Trials, Jerry J Johnson,Scott D Haley,Sally Jones,Ed P Asfeld,Ron Francis Meyer,Wilma Trujillo,Dennis A Kaan,K. Roesch,Kevin Larson,Merle F Vigil,Brett Terrill Pettinger,Rick Allen Novak,Frank B Peairs,Kirk Dale Broders,Patrick F Byrne,Todd A Gaines,Philip Westra,T. Walker,Brad Erker

Wheat pests: insects, mites and prospects for the future, M. O. Harris,K. Anderson,M. El-Bouhssini,Frank B Peairs,G. L. Hein,S. Xu.

Registration of 'Sunshine' wheat. , Scott D Haley,Jerry J Johnson,Frank B Peairs

MODIS Imagery Improves Pest Risk Assessment: A Case Study of Wheat Stem Sawfly (Cephus cinctus, Hymenoptera: Cephidae) in Colorado, USA, Jordan Lestina,Maxwell Cook,Sunil Kumar,Jeffrey Morisette,Paul James Ode,Frank B Peairs

MODIS Imagery Improves Pest Risk Assessment: A Case Study of Wheat Stem Sawfly (Cephus cinctus, Hymenoptera: Cephidae) in Colorado, USA, Jordan Lestina,Maxwell Cook,Sunil Kumar,Jeffrey Morisette,Paul James Ode,Frank B Peairs

Phylogeography of the wheat stem sawfly, Cephus cinctus Norton (Hymenoptera: Cephidae): Implications for pest management, V. Lesieur,J-F. Martin,D. K. Weaver,K. A. Hoelmer,D. R. Smith,W. L. Morrill,N. Kadiri,Frank B Peairs,D. M. Cockrell,T. L. Randolph,D. K. Waters,M-C. Bon

Temperature variability is a key component in accurately forecasting the effects of climate change on pest phenology, S. C. Merrill,Frank B Peairs

Phylogeography of the Wheat Stem Sawfly, Cephus cinctus Norton (Hymenoptera: Cephidae): Implications for Pest Management, Vincent R Lesieur,Jean-Fancois Martin,David Weaver,Kim Hoelmer,David Smith,Wendell Morrill,Nassera Kadiri,Frank B Peairs,Darren Matthew Cockrell,Terri L Randolph,Debra Waters,Mari-Claude Bon

2015 Colorado Field Crop Insect Management Research Demonstration Trials, Darren Matthew Cockrell,Terri L Randolph,Jeff B Rudolph,Frank B Peairs

Change in biotypic diversity of Russian wheat aphid (Hemiptera: Aphididae) populations in the United States. , G. J. Puterka,K. L. Giles,M. J. Brown,S. J. Nicholson,F. B. Peairs,F. B. Peairs,T. L. Randolph,G. J. Michels,E. D. Bynum,T. L. Springer,J. S. Armstrong,D. W. Mornhinweg

Registration of 'Sunshine' wheat. , Scott D Haley,Jerry J Johnson,Frank B Peairs

Field key — Insect, mite pests and diseases. , Frank B Peairs

Insect Management, J. Bradshaw,Frank B Peairs

Validating spatiotemporal predictions of an important pest of small grains. , S. C. Merrill,T. O. Holtzer,F. B. Peairs,P. J. Lester

Genetic mapping of resistance to Diuraphis noxia (Kurdjumov) biotype 2 in wheat (Triticum aestivum L.) accession CI2401. , M. Fazel-Najafabadi,J. B. Peng,Frank B Peairs,H. Simkova,A. Kilian,N. L. Lapitan

2014 Colorado Field Crop Insect Management Research Demonstration Trials, Terri L Randolph,Darren Matthew Cockrell,Jeff B Rudolph,Frank B Peairs

Making better decisions: 2014 Colorado wheat variety performance trials. , Jerry J Johnson,Scott D Haley,Michael E Bartolo,Kevin Larson,Merle Vigil,Bruce Bosley,Ronald Meyer,Wilma Trujillo,Sally Marie Jones-Diamond,Jim Hain,Jeffery William Davidson,Terri L Randolph,Frank B Peairs,Courtney Elaine Jahn,Rick Allen Novak,Jessica G Davis,Glenda Mostek

Virus-induced gene silencing suggests (1,3;1,4)-ß-glucanase is a susceptibility factor in the compatible russian wheat aphid-wheat interaction., V A Anderson,Scott D Haley,Frank B Peairs,L van Eck,Jan E Leach,Nora L Lapitan

Examining the Competitive Advantage of Diuraphis noxia (Hemiptera: Aphididae) Biotype 2 Over Biotype 1, Scott C Merrill,Terri L Randolph,Frank B Peairs,Gerry J Michels,Jr,Thia Bareta Walker

2013 Colorado field crop insect management research and demonstration trials. , Frank B Peairs,J. B. Rudolph,T. L. Randolph

Effects of planting date and barley variety on Russian wheat aphid (Hemiptera: Aphididae) populations in Colorado, Kansas, and Nebraska. , P. A. Sotelo,G. L. Hein,Frank B Peairs,C. M. Smith

Virus-induced gene silencing suggests that (1,3;1,4)-ß-glucanase is a susceptibility factor in the compatible Russian wheat aphid-wheat interaction. , Valdez Victoria,Scott D Haley,Frank B Peairs,Jan E Leach,Nora L Lapitan

Characterization of eight Russian wheat aphid (Hemiptera: Aphididae) biotypes using two-category resistant—susceptible plant responses. , G. J. Puterka,S. J. Nicholson,M. J. Brown,W. R. Cooper,Frank B Peairs,T. L. Randolph

Registration of 'Antero' wheat, Scott D Haley,Jerry J Johnson,Frank B Peairs

Registration of 'Cowboy' wheat, Scott D Haley,Jerry J Johnson,Frank B Peairs

Validating spatiotemporal predictions of a important pest of small-grains, Scott C. Merrill,Tom O Holtzer,Frank B Peairs,Philip J. Lester

Virus-induced gene silencing suggests that (1,3;1,4)-ß-glucanase is a susceptibility factor in compatible Russian wheat aphid – wheat Interactions , Tori Ashley Anderson,Scott D Haley,Frank B Peairs,Leon van Eck,Jan E Leach,Nora L Lapitan

Making better decisions: 2013 Colorado wheat variety performance trials., Jerry J Johnson,Scott D Haley,Sally Marie Jones-Diamond,Kevin Larson,Michael E Bartolo,Jeffery William Davidson,Frank B Peairs,Ned A Tisserat,Philip Westra,Jessica G Davis,Rick Allen Novak,Merle Vigil,Glenda Mostek,Bruce Bosley,Ron Meyer,Wilma Trujillo,Ben Irell

2011 Colorado field crop insect managementresearch and demonstration trials

Cyclical parthenogenetic reproduction in theRussian wheat aphid (Hemiptera: Aphididae) in theUnited States: Sexual reproduction and its outcomeon biotypic diversity

Inheritance and genetic mapping of Russian wheat aphid resistance in Iranian wheat land race accession PI 626580

Inheritance and genetic mapping of Russian wheat aphid resistance in Iranian wheat landrace accession PI 626580, Tori Ashley Anderson,Patrick F Byrne,Nora LV Lapitan,Frank B Peairs,Amy Bernardo,Guihua Bai,Scott D Haley

Making better decisions: 2012 Colorado wheatvariety performance trials

Molecularcharacterization of Russian wheat aphidconsumption by spiders in winter wheat

Quantifying Russian wheat aphid pest intensityacross the Great Plains

Registration of 'Brawl CL Plus' wheat

Registration of 'Denali' wheat

Registration of 'Stoneham' spring feed barleyresistant to Russian wheat aphid

Registration of ‘Brawl CL Plus’ wheat, Scott D Haley,Jerry J Johnson,Phillip H Westra,Frank B Peairs,John A Stromberger,Emily E Hudson,Scott A Seifert,Rebecca Kottke,Victoria A Valdez,Jeff B Rudolph,others

Registration of'Byrd' wheat

Russian wheat aphid(Hemiptera: Aphididae) reproduction anddevelopment on five noncultivated grass hosts

Sustainable dryland agroecosystemsmanagement

Sustainable drylandagroecosystems management: 2006-2007 results

Registration of 'Stoneham' spring feed barley resistant to Russian wheat aphid, D Mornhigweg,P Bregitzae,D Porter,Frank B Peairs,D Baltensperger,G Hein,Terri L Randolph,M Koch,Thia Bareta Walker

2010 Colorado field crop insect managementresearch and demonstration trials

Inheritance of Russianwheat aphid resistance from tetraploid wheataccessions during transfer to hexaploid wheat

Legumeinsect pests

Making better decisions:2011 Colorado wheat variety performance trials

Occurrence of Russian Wheat Aphid (Homoptera: Aphididae) on Non-cultivated Grasses within Colorado Montane Environments, Terri L Randolph,Frank B Peairs,Thia Bareta Walker

Otherinsects and pests

Registration of 'Snowmass'wheat

Registration of six wheat-ryeaddition lines resistant to the Russian wheataphid

Russian wheat aphid(Hemiptera: Aphididae) reproduction anddevelopment on five noncultivated grass hosts

Spatial variability of western bean cut worm (Lepidoptera: Noctuidae) pheromone trap captures in sprinkler irrigated corn in eastern Colorado

Spatial Variability of Western Bean Cutworm (Lepidoptera: Noctuidae) Pheromone Trap Captures in Sprinkler Irrigated Corn in Eastern Colorado, Scott C Merrill,Shawn M Walter,Frank B Peairs,Jennifer A Hoeting

Wheat stemsawfly: A new pest of Colorado wheat

2009 Colorado field crop insect management research and demonstration trials

Examining the correlation between fall and spring population densities of the Russian wheat aphid (Hemiptera: Aphididae)

Host associations and incidence of Diuraphis spp in the Rocky Mountain region of the United States, and pictorial key for their identification

Implications of Russian wheat aphid, Diuraphis noxia, falling rates for biological control in resistant and susceptible winter wheat

Nonlinear Degree-Day Models for Postdiapause Development of the Sunflower Stem Weevil (Coleoptera)

Nonlinear degree-day models for postdiapause development of the sunflower stem weevil (Coleoptera: Curculionidae), Scott C Merrill,Assefa B Gebre-Amlak,J Scott Armstrong,Frank B Peairs

Perceived consequences of herbicide-tolerant and insect-resistant crops on integrated pest management strategies in the western United States: Results of an online survey, Judith Eileen Harrington,Patrick F Byrne,Frank B Peairs,Scott J Nissen,Philip Westra,Peter C Ellsworth,Al Fournier,Carol A Mallory-Smith,Robert S Zemetra,W Brien Henry

Relationship between Russian wheat aphid abundance and edaphic and topographic characteristics in wheat fields

Virus-induced gene silencing of WRKY53 and an inducible phenylalanine ammonia-lyase in wheat reduces aphid resistance

Wheat production and pest management for the Great Plains region

Virus-induced gene silencing of WRKY53 and an inducible phenylalanine ammonia-lyase in wheat reduces aphid resistance., L Van Eck,T Schultz,Jan E Leach,S R Scofield,Frank B Peairs,A M Botha,Nora L Lapitan

Diuraphis noxia Reproduction and Development With a Comparison of Intrinsic Rates of Increase to Other Important Small Grain Aphids

Modeling Spatial Variation of Russian Wheat Aphid Overwintering Population Densities in Colorado Winter Wheat

Molecular cytogenetic and agronomic characterization of advanced generations of wheat x triticale hybrids resistant to Diuraphis noxia (Mordvilko)

Registration of 'Sidney' Spring Feed Barley Resistant to Russian Wheat Aphid

Registration of 'Thunder CL' Wheat

Registration of ‘Thunder CL’wheat, Scott D Haley,Jerry J Johnson,Phillip H Westra,Frank B Peairs,John A Stromberger,Emily E Heaton,Scott A Seifert,Rebecca Kottke,Jeff B Rudolph,Guihua Bai,others

Seasonal Presence of the Russian Wheat Aphid (Hemiptera)

Registration of 'Sidney' spring feed barley resistant to Russian wheat aphid, D Mornhigweg,P. Bregitzae,D Porter,Frank B Peairs,D Baltensperger,Gary Hein,Terri L Randolph,Mike Koch,Thia Bareta Walker

Russian wheat aphid, Diuraphis noxia (Kurdjumov), reproduction and development with a comparison of intrinsic rates of increase to other important small grain aphids: a meta-analysis., Scott C. Merrill,Tom O Holtzer,Frank B Peairs

Biotypic diversity in Colorado Russian wheat aphid (Hemiptera)

Ground beetle (Coleoptera)

Registration of 'Bill Brown' Wheat

Reproduction and development of Russian wheat aphid Biotype 2 on crested wheatgrass, intermediate wheatgrass, and susceptible and resistant wheat

Reproductive rates of Russian wheat aphid (Hemiptera)

Insect pest densities across site-specific management zones of irrigated corn in northeastern Colorado

Molecular mapping of the Russian wheat aphid resistance gene Dn2414 in wheat

Registration of 'Ripper' Wheat

Resistance to Rhopalosiphum padi (Homoptera)

Yield response to Russian wheat aphid (Homoptera)

Biotypic variation among North American Russian wheat aphid (Homoptera)

Modeling the effect of Russian wheat aphid, Diuraphis noxia (Mordvilko) and weeds in winter wheat as guide to management

Registration of 'Bond CL' wheat

Registration of 'protection' wheat

Response of resistant and susceptible barley to infestations of five Diuraphis noxia (Homoptera)

Yield response to Russian wheat aphid (Hemiptera)

Development and assessment of an on-line High Plains Integrated Pest Management Guide for a regional audience, Will T Lanier,M J Brewer,Frank B Peairs,Gary L Hein,Howard F Schwartz,J B Campbell,Sue Blodgett

Biotype 2 Russian wheat aphid resistance among wheat germplasm accessions

Comparison of Dn4- and Dn7-carrying spring wheat genotypes artificially infested with Russian wheat aphid (Homoptera)

Influence of three resistance sources in winter wheat derived from TAM 107 on yield response to Russian wheat aphid

Integrated Pest Management for Herbicide Tolerant and Insect Resistant Crops: Assessing Information and Research Needs., Robert Zemetra,Jack Brown,Patrick F Byrne,Judith Eileen Harrington,Scott J Nissen,Frank B Peairs,Phil Westra,Oscar Riera-Lizarazu,Carol Mallory-Smith,Peter Ellsworth

Integrated Pest Management for Herbicide Tolerant and Insect Resistant Crops: Assessing Information and Research Needs., Robert Zemetra,Jack Brown,Patrick F Byrne,Judy Harrington,Scott J Nissen,Frank B Peairs,Phil Westra,Oscar Riera-Lizarazu,Carol Mallory-Smith,Peter Ellsworth

Management implications of reduced fallow periods in dryland cropping systems in the Great Plains

Registration of 'Hatcher' wheat

Yield response and categories of resistance to Russian wheat aphid in four Dn4 hard red winter wheat cultivars

Occurrence of a new Russian wheat aphid biotype in Colorado

Registration of 'Ankor' wheat

Above winter wheat

AP502 CL winter wheat

Categories of resistance at different growth stages in halt, a winter wheat resistant to the Russian wheat aphid (Homoptera)

Categories of resistance at four growth stages in three wheats resistant to the Russian wheat aphid (Homoptera)

Degree day model for sunflower stem weevil (Coleoptera: Curculionidae) management, Assefa B Gebre-Amlak,Frank B Peairs

Plant damage and yield response to the Russian wheat aphid (Homoptera)

Registration of 'Avalanche' wheat

Augmentative releases of commercial biological control agents for Russian wheat aphid management in winter wheat

Registration of CO960293-2 wheat germplasm resistant to Wheat streak mosaic virus and Russian wheat aphid

2003 Colorado field crop insect management research and demonstration trials, Shawn M Walter,Frank B Peairs,Assefa B Gebre-Amlak

Registration of 'Prairie Red' wheat

Registration of 'Prowers 99' Wheat

Registration of 'Prowers' wheat

Registration of 'Yumar' wheat

Precision farming

Precision Farming: From Technology to Decisions A Case Study, Kim L Fleming,Dwayne G Westfall,Dale F Heermann,D Bruce Bosley,Frank B Peairs,Philip Westra

Integrated pest management, Howard F Schwartz,Frank B Peairs

Economic injury levels for the Russian wheat aphid (Homoptera)

Effect of plant phenology and climate on Russian wheat aphid (Homoptera)

Environmental parameters related to winter mortality of the Russian wheat aphid (Homoptera)

Evaluation of hymenopterous biological control agents of the alfalfa weevil larvae Hypera postica (Coleoptera)

Gustatory and olfactory responses of Cylindrocopturus adspersus (Leconte) to various plant species in the laboratory

Integrated Pest Management of insects, plant pathogens, and weeds in dryland cropping systems of the great plains

Registration of 'Halt' wheat

Registration of Russian wheat aphid-resistant wheat germplasm CORWA1

Winter wheat planting date effect on Russian wheat aphid (Homoptera)

Germinating Corn Extracts and 6-Methoxy-2-Benzoxazolinone - Western Corn-Rootworm (Coleoptera, Chrysomelidae) Larval Attractants Evaluated with Soil Insecticides

Leaf Unrolling of 3 Wheat Genotypes in Russian Wheat Aphid Extracts

The Effect of Planting Time Insecticides and Liquid Fertilizer on the Russian Wheat Aphid (Homoptera, Aphididae) and the Lesion Nematode (Pratylenchus-Thornei) on Winter-Wheat

Binomial Regression-Models for Spring and Summer Infestations of the Russian Wheat Aphid (Homoptera, Aphididae) in the Southern and Western Plains States and Rocky-Mountain Region of the United-States

Comparison of Chemigated and Aerially-Applied Chlorpyrifos and Fenvalerate for Control of European Corn-Borer (Lepidoptera, Pyralidae) Larvae

Distribution of Overwintering Russian Wheat Aphid (Homoptera, Aphididae) in Furrow-Irrigated Small Grains in Western Colorado

Inheritance of Resistance of 3 Russian Triticale Lines to the Russian Wheat Aphid

Alternate Hosts of the Russian Wheat Aphid (Homoptera, Aphididae) in Northeastern Colorado

Inheritance of Resistance of Pi 372129 Wheat to the Russian Wheat Aphid

Russian Wheat Aphid Reaction and Agronomic and Quality Traits of a Resistant Wheat

Registration of 3 Germplasm Lines of Pinto Bean, Mark A Brick,Don R. Wood,Marco Ballarin,Howard F Schwartz,Frank B Peairs,Barry Barry Ogg,James W. Echols

Effect of Vernalization on Russian Wheat Aphid Resistance of Wheat and Triticale in Greenhouse Screening-Tests

Gene Location for Russian Wheat Aphid Resistance of Imperial Rye Using Wheat-Rye Addition Lines

Russian Wheat Aphid (Diuraphis-Noxia) Resistance in Wheat and Related Species

Russian Wheat Aphid Resistance of Wheat, Rye, and Triticale in Greenhouse Tests

Persistence and mobility of pesticides in soil and water, Dean K McBride,Dallas E Peterson,H Arthur Lamey,Jim C Loftis,Frank B Peairs,Howard F Schwartz,Philip Westra,Bert L Bohmont

Effects of Cropping System and Insecticide Protection on Insects Associated with Maize (Zea-Mays-L) and Cassava (Manihot-Esculenta Crantz)