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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 511 for “"Pests"”.
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Adaptation and hybridization in Helicoverpa crop pests
… In this thesis I focus on noctuid crop pests in the genus Helicoverpa, which are among the most economically significant agricultural pests in the world. Helicoverpa armigera was first reported as an invasive species in Brazil in 2013, where it hybridized with its native sister species …
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Symbionts and immune defence in lepidopteran crop pests
… tools can be widely useful in studies of these pests. First, using PCR, PCR-RFLP and gene sequencing, we confirmed the presence of the Old World bollworm Helicoverpa armigera in Minas Gerais state and identified the prevalence and genetic diversity of symbionts with potential use for noctuid …
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The Insect Pests of Horseradish in Southwestern Illinois
Made available in DSpace on 2015-05-12T17:07:09Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 0013543.PDF: 4428569 bytes, checksum: a1a270fd1e23cdf321aa6b7eadd83923 (MD5) Previous issue date: 1955
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Development of microbial control for lepidopteran pests of the corn ear
<p>The problems associated with chemical pesticide misuse have led to the search for alternative forms of insect pest management such as microbial control that are environmentally and ecologically sound. The efficacy of three Bacillus thuringiensis Berliner (Bt) products and Anagrapha falcifera …
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Impact of carbofuran on spring-seeded alfalfa and associated insect pests
Carbofuran was applied at planting to study the influence on alfalfa (Medicago sativa L.) growth, potato leafhopper, Empoasea fabae (Harris), and seedcorn maggot, Hylemya platura (Meigen). No increases in radicle length, trifoliate leaf development, or dry matter resulted from carbofuran …
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Floral derived compounds as attractants for agricultural pests in the family Noctuidae
… family Noctuidae are significant agricultural pests. Specific floral volatiles are attractive to both male and female Noctuidae and may be used to as attractants in crop protection. For the first time the following research compares two types of floral volatile blends - those that mimic natural …
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Effects of postharvest oils on arthropod pests of citrus / by Peter Taverner
… of petroleum and vegetable oils against citrus pests.
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Interaction Between Weeds and Insect Pests With Snap Beans (Phaseolus Vulgaris L.)
"Field experiments were conducted to evaluate the interaction of either redroot pigweed (Amaranthus retroflexus L.) or large crabgrass (Digitaria sanguinalis L.) and bean leaf beetle or potato leafhopper in snap beans (Phaseolus vulgaris L.) cv ""Matador"". The main treatment was emergence time of …
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Predicting Pests: A History of International Plant Pest Reporting and Risk Analysis
… Plant protection experts understood the term ‘pests’ to include anything that harmed plants of concern, from insects to nematodes, bacteria, viruses, fungi, rodents, and (by the end of the century) weeds. Their e"orts to predict and pre-empt pest invasion drew on contemporaneous attempts to …
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Characteristics of biological control agents and their antagonism against rice pathogens and pests
… agents for the control of pathogens and pests is a potential tool to sustain rice productivity and reduce ecological and environmental impacts due to pesticide overuse. Initially, 15 putatively beneficial bacteria, previously shown to be antagonistic to rice fungal pathogens (Rhizoctonia …
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Biological control agents of soybean insect pests in the Tidewater area of Virginia
… biological control agents which affect soybean pests in the Tidewater area were investigated, and their relative values were determined. Two pentatomids, <u>Podisus Macu1iventris</u> Say and <u>Stiretrus anchorago</u> F., were the only significant bio-contro1 agents which attacked the Mexican …
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The effect of a cabbage-carrot intercropping system on the incidence of cabbage pests
… significantly to global crop production. Insect pests associated with cruciferous crops have the potential to destroy harvests. The diamondback moth, Plutella xylostella (L.) (Lepidoptera: Plutellidae) and cabbage aphids, Brevicoryne brassicae (L.) and Lipaphis erysimi (Kaltenbach) (Homoptera: …
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Effects of Natural Enemies and Host Condition on Populations of Insect Pests of Trees
In the third chapter, I reviewed the primary and secondary literature on parasitoids of the wood-boring larvae of cerambycid beetles to examine the relationship between the feeding niche of beetles and the number and types of parasitoids that attack them. Significantly fewer species of parasitoids …
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Pests, Knowledge and Boundaries in the Early Union of South Africa: categorising, controlling, conserving
… humans and animals responsible for creating ‘pests’ as an element in the physical and intellectual landscape of rural South Africa in the 1910s through the 1930s. Through analysing four groups of animals deemed to be pests – herds of ‘rogue’ elephants; trypanosomes and big game; ‘wild birds’ …
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Broccoli yield response to cabbage looper and varietal preferences of lepidopterous pests of broccoli
Respondents of the 1986 Broccoli Growers Survey grew an average of 6.2 acres of broccoli in Fall 1986; popular varieties were Green Valiant (87.5% of respondents), Packman and Emperor (62.5%). Less than 5% of tobacco land was converted to broccoli production by 62.5% of the growers. Before heading, …
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