Results 311 to 320 of about 776,154 (331)
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ECONOMIC THRESHOLDS AND ECONOMIC INJURY LEVELS OF CEREAL APHIDS ON BARLEY IN SOUTHWESTERN QUEBEC
The Canadian Entomologist, 1980AbstractArtificial infestations of cereal aphids in caged plants were made at different growth stages of barley in the field in 1978 and 1979. Forty, 80, 160, and 200 aphids/tiller reduced grain yield significantly (P < 0.01) when introduced into caged plants at flowering and milky stages for 2 weeks.
S. A. Ba-Angood, R. K. Stewart
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Crop Protection, 1982
Abstract Insecticides at different rates and times of application were used to produce different population levels of pea aphid, Acyrthosiphon pisum (Harris) (Hemiptera: Aphididae), on plots of two fields of second regrowth alfalfa, Medicago sativa L. in Minnesota.
G.W. Cuperus +3 more
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Abstract Insecticides at different rates and times of application were used to produce different population levels of pea aphid, Acyrthosiphon pisum (Harris) (Hemiptera: Aphididae), on plots of two fields of second regrowth alfalfa, Medicago sativa L. in Minnesota.
G.W. Cuperus +3 more
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Journal of Economic Entomology, 2015
The economic injury level for potato leafhopper, Empoasca fabae (Harris), in alfalfa (Medicago sativa L.) was developed over 30 yr ago. In response to increasing market value of alfalfa, farmers and consultants are interested in reducing the economic threshold for potato leafhopper in alfalfa.
Elissa M, Chasen +2 more
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The economic injury level for potato leafhopper, Empoasca fabae (Harris), in alfalfa (Medicago sativa L.) was developed over 30 yr ago. In response to increasing market value of alfalfa, farmers and consultants are interested in reducing the economic threshold for potato leafhopper in alfalfa.
Elissa M, Chasen +2 more
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Economic Thresholds and Injury Levels for Insect Pests of Rice
1991Over 90% of the world’s rice is grown in Asia where more than 100 insect species attack the crop (Norton and Way 1990). Other rice-growing areas each with a unique complex of insect pests include Latin America, Africa, Australia, Europe, and the United States.
Michael O. Way +4 more
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Agronomy Journal, 1993
AbstractAlthough the alfalfa weevil Hypera postica (Gyllenhal)] is an important alfalfa (Medicago sativa L.) pest, relatively little is known about how defoliation at specific plant developmental stages affects yield. This study was conducted to characterize yield responses of alfalfa to simulated alfalfa weevil injury when injury was initiated at the ...
Robert K. D. Peterson +2 more
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AbstractAlthough the alfalfa weevil Hypera postica (Gyllenhal)] is an important alfalfa (Medicago sativa L.) pest, relatively little is known about how defoliation at specific plant developmental stages affects yield. This study was conducted to characterize yield responses of alfalfa to simulated alfalfa weevil injury when injury was initiated at the ...
Robert K. D. Peterson +2 more
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Soybean Cultivars and Insect Defoliation: Yield Loss and Economic Injury Levels
Agronomy Journal, 1998AbstractUnderstanding the response of soybean [Glycine max (L.) Merr.] cultivars to insect defoliation is important for identifying differences in insect tolerance and compensation among soybean genotypes, for assessing yield loss differences among cultivars, and for determining if a single economic injury level (EIL) can be used for all cultivars ...
Fikru J. Haile +2 more
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Determination of multiple-species economic injury levels for rice insect pests
Crop Protection, 2012Abstract Yield loss to damage functions were established to determine multiple-pest economic injury levels (EILs) on Pusa Basmati 1 rice ( Oryza sativa L.) at different crop growth stages through field and pot experiments in 2009 and 2010. The yield loss to damage functions were derived for two-pest combinations of leaf folder, Cnaphalocrocis ...
K. Selvaraj +2 more
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Economic Injury Levels to Field Corn from Slug (Stylommatophora: Agrolimacidae) Feeding
Journal of Economic Entomology, 1994Slugs are important corn pests, but little is known about how their feeding on corn seedlings affects grain yields. Individual corn plants were infested with juvenile slugs, Deroceras reticulatum (Mueller), at four densities at the following three stages of growth: before seedling emergence and at the two- and four-leaf stage.
Robert A. Byers, Dennis D. Calvin
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Mathematical Biosciences
Integrated Pest Management (IPM) poses a challenge in determining the optimal timing of pesticide sprays to ensure that pest populations remain below the Economic Injury Level (EIL), due to the long-term residual effects of many pesticides and the delayed responses of pest populations to pesticide sprays.
Yang, Huan, Tan, Yuanshun, Tang, Sanyi
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Integrated Pest Management (IPM) poses a challenge in determining the optimal timing of pesticide sprays to ensure that pest populations remain below the Economic Injury Level (EIL), due to the long-term residual effects of many pesticides and the delayed responses of pest populations to pesticide sprays.
Yang, Huan, Tan, Yuanshun, Tang, Sanyi
openaire +3 more sources