Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 20 for “"sweep net"”.
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The effect of cropping systems on the pest complex in Virginia soybeans and calibration of the sweep net and ground cloth sampling methods for use in these cropping systems
… each pair was collected with a 38 cm. diameter sweep net (25 sweeps per sample) and the other sample was collected with a 0.91 meter ground cloth. In addition, after each ground cloth sample was obtained, the foliage and base of the plants in the 0.91 m sample were searched for additional …
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Evaluation of Rice Stink Bug, Oebalus pugnax (F.), Damage and Monitoring Techniques in Rice, Oryza sativa L., and Grain Sorghum, Sorghum bicolor (L.)
… conducted from 2016-2018 to asses variation in sweep net sampling by observing producers, researchers, extension personnel, consultants and their workers. Large levels of variation were found in sweep lengths between observed sweepers and reliability of smaller sweep lengths that were commonly …
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Behavior of and Crop Injury Induced by Native and Exotic Stink Bugs in Mid-Atlantic Soybean
… the percentage of stink bugs below the top 38 cm sweep net intercept zone. In both years of observations, between 15 and 20% of stink bugs were observed below the 38 cm sweep net zone.
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Spiders of alfalfa with notes on the biology of Tetragnatha laboriosa Hentz
… species were plotted. The D-Vac sampler and the sweep net were the major sampling methods utilized. Fourteen families consisting of 75 genera and 112 identifiable species were found. Tetragnatha laboriosa Hentz, Pachygnatha tristriata Koch, Misumenops asperatus (Hentz) and Oxyopes salticus Hentz …
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Control of the potato leafhopper, Empoasca fabae (Harris), and the influence of leafhopper populations on peanut yields in Virginia
… throughout 1975 and 1976 using a 12-inch sweep net. Grade, yield, and value data were collected from all experiments. Significant reductions of leafhopper populations were achieved with a broad range of chemicals. In many instances, the pesticidal activity of the test materials was not …
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Species survey, monitoring and management of economically important stink bug species in eastern Virginia
… were the most common. Two sampling methods, the sweep net and the beat sheet, were assessed in soybean and cotton. There was less variability with the sweep net method compared to the beat sheet method. Laboratory bioassays and field trials were conducted to evaluate the toxicity and efficacy of …
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The Spatial Trends of Japanese Beetles in Illinois Soybean Fields and Their Effects on Sampling and Production
… measured with two different sampling methods (sweep-net samples and visual counts) in both intensively and extensively sampled fields, and the influence of field border type (i.e., corn, grass, soybean, road) was analyzed. Additionally, the relationship between densities of Japanese beetles and …
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Relationships Among Aquatic Macroinvertebrates, Endangered Waterbirds, and Macrophytes in Taro Lo'I At Hanalei National Wildlife Refuge, Kauai, Hawaii
… prolific invertebrate taxa among taro loi in sweep net samples in 2005. Freshly flooded loi during and recently after planting are dominated by chironomids and oligochaetes, shifting to snails and then other insects as the taro crop matures. Invertebrate taxa richness in sweep net samples …
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Risk Assessment and Improving Brown Marmorated Stink Bug (Stål), Halyomorpha halys, Sampling in Virginia Soybean Systems
… a visual plant inspection method with a standard sweep net strategy for sampling BMSB. Overall, the two methods were highly correlated with a correlation coefficient of R=0.83. Visual inspection appears to be an effective method for assessing BMSB populations in soybean. One of the major factors …
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Biodiversity impacts of Chilean needle grass Nassella neesiana on Australia’s indigenous grasslands
… similar inside and outside patches. Analysis of sweep net samples determined that invertebrate populations and species richness were significantly reduced in N. neesiana grassland, although numerous native insect species consume the plant. Much of the loss of diversity in invaded areas probably …
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Evaluation of Economic Injury Levels and Chemical Control Recommendations for Rice Stink Bug (Oebalus Pugnax) in Louisiana
… stink bugs feeding in rice. The efficiency of sweep-net sampling was first determined using a mark-recapture study in small plots to establish the necessary density for infesting caged rice plots. Cage studies were carried out in 2010-2012, and RSB were infested at levels estimated to be 1 to …
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Impact of carbofuran on spring-seeded alfalfa and associated insect pests
… Potato leafhopper populations were monitored by sweep net sampling. Severe seedcorn maggot damage and high larval populations were associated with conventionally planted fields prepared by disking a small grain cover crop, and were effectively controlled by carbofuran. Conventional plantings …
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Is Everything Connected? Following the Predators, Pests, and Plants Within a No-Till, Western Montana Agroecosystem
… for predators/pests involved weekly sweep-net sampling, pitfall trap installation, and direct plant examination. Insecticides were applied as a bi-weekly “calendar” application (pyrethrin/rotenone) or as a pest-density “threshold” dependant application (Bt). Generally, pest control …
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Is Everything Connected? Following the Predators, Pests, and Plants Within a No-Till, Western Montana Agroecosystem
… for predators/pests involved weekly sweep-net sampling, pitfall trap installation, and direct plant examination. Insecticides were applied as a bi-weekly “calendar” application (pyrethrin/rotenone) or as a pest-density “threshold” dependant application (Bt). Generally, pest control …
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Insect diversity and composition during the wet and dry seasons in three forest types of Johor, Malaysia
… methods employed as baited pitfall traps, aerial net, manual collection and sweep net. The sampling methods were employed three days in each location. The different insects sampled, were higher during the wet season as compared to the dry season (diversity and abundance). Although Bukit Soga …
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Resurrection ecology of invertebrates in temporary wetlands in the Cape Floristic region: effects of urbanisation and fire
… monthly aquatic phase sampling using standard sweep net methods (during September and October 2016). The effects of fire were tested, on hatching success by staging vegetation fires over the collected soil samples for five temporary wetland areas in the same region. Mann-Whitney U tests were …
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Biodiversity patterns of wetland macroinvertebrate assemblages in the South-Western Cape, South Africa
… were sampled separately using a square-framed sweep net with a 23.5cm mouth and 80l1m mesh and physico-chemical attributes measured at each site. A total of 126 taxa emanating from more than 26 000 individuals representing 73 genera and 51 families was recorded. Currently, five species new to …
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Effects of insecticides on potato leafhoppers Empoasca fabae (Harris) and its predators
… in alfalfa. Samples were taken using a 38 cm sweep net employing a 180° motion at 2 days, 1 week, and 2 weeks after treatment. In both tests, significant control was provided by the chemicals against potato leafhoppers 48 hours following application. A gradual population recovery occurred one …
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Community Compostition and Microhabitats of Macroinvertebrates on Sandbars within the Lower Missouri River as a Food Source for Foraging Migratory Shorebirds
… fish were collected in aquatic habitats with a sweep net and stovepipe sampler and invertebrates were collected in terrestrial habitats with a core sampler and sticky traps. A total of 3169 macroinvertebrates were collected over six sampling periods, 2055 were captured in aquatic habitats and …
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Social, ecological, and developmental influences on fruit and invertebrate foraging strategies and gut microbial communities in white-faced capuchins (Cebus capucinus)
… was assessed using 10 composite insect traps and sweep net sites. Fecal samples were collected throughout the study period (n=225). DNA was extracted from fecal samples, and the COI mtDNA and the v3-v5 region of the 16S rRNA genes were amplified and sequenced to identify invertebrates consumed and …