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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 106 for “"Insect pests"”.
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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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Impact of carbofuran on spring-seeded alfalfa and associated insect pests
… Soi 1 samples were screened for soil-dwelling insects. 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 …
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Interaction Between Weeds and Insect Pests With Snap Beans (Phaseolus Vulgaris L.)
… emerging pigweed. The population of the two insects depended on the year, weed type and emergence time. Bean leaf beetle were lower in the weed free snap bean plots by 48 and 58% compared to snap bean plots with early emerging redroot pigweed and large crabgrass respectively. Bean leaf beetle …
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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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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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Understanding the Delicate Balance between Microbial Pathogens and Insect Pests and Optimising Protection in Actinidia chinensis
Kiwifruit (Actinidia species) is a major horticultural crop. Actinidia chinensis var. chinensis ‘Hort16A’ is challenged by various biotic stressors with different lifestyles, including the hemi-biotrophic bacterial pathogen Pseudomonas syringae pv. actinidiae (psa) and the necrotrophic fungal …
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A Comparative Study of Medicago truncatula Transcriptomes as They Relate to Saponin Defenses Against Insect Pests
… <p>variety of functions including antimicrobial, insecticidal, and nematicidal activities. This</p> <p>research assessed the performance of the beet armyworm, Spodoptera exigua, following ad</p> <p>libero feeding on Medicago truncatula accessions differing in specialized metabolite and</p> …
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Effects of the agricultural landscape on native bees and insect pests in recently established pollinator habitat
Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD system
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Spiders associated with apple trees in Virginia with notes on their importance in controlling orchard insect pests
… of 6 a.m. - 6 p.m. Spider feeding tests on insect pests-prey and beneficials showed that one pest species could be preyed upon by a complex of spider species. Beneficial insects such as Lepthothrips mali (Fitch) also were susceptible to capture by several spider species.
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Effects of Silicon -Based Fertilizer Applications on the Development and Reproduction of Insect Pests Associated With Greenhouse -Grown Crops
… do not inhibit feeding of certain phloem-feeding insect pests such as citrus mealybug and greenhouse whitefly. Although, silicon may function as a protective or mechanical barrier associated with increased epidermal leaf thickness/toughness and strengthening cell walls in certain plant species, …
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Molecular approaches to increasing resistance of wheat (Triticum aestivum L.) towards two insect pests; Cereal aphid (Sitobion avenae F.) and Wheat bulb fly (Delia coarctata Fallen).
… and wheat bulb fly (Delia coarctata) are serious pests of wheat in the UK. At the present, chemical pesticides are used to control these insects, but they are limited in effectiveness, and have undersirable ecological impacts. There is a need to improve wheat genetically to be resistant to such …
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Introgression of the Genes for Sesquiterpene Carboxylic Acid Synthesis From a Wild Tomato, Lycopersicon Hirsutum, Into the Cultivated Tomato for Increased Host -Plant Resistance to Insect Pests
F2 and backcross progeny were assayed for the presence of polymorphic molecular markers using the Amplified Fragment Length Polymorphism (AFLP) protocol. Progeny of each generation were separated into high and low classes for SCA levels and the DNA combined of individual plants within the …
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A genomic analysis of the insect pest populations of cowpea in West Africa
… 80% of the world’s cowpea production. However, insect pests are major constraints to cowpea production in the West African sub-region. The crop is severely attacked at every stage of its growth by different insect pests from the pre-flowering stage right through storage. Damage by insect pests …
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The investigation of a novel proteinase inhibitor as a means to transfer insect resistance to plants
… the most important being the bionomics of insect pests; monitoring systems to establish the prevalence and seasonal occurrence of insect pests; calculation of economic thresholds; the biology of parasites and predators; utilisation of insect resistant plant varieties; and methods to …
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Aspect of the biology of sod webworms (Lepidoptera: Pyralidae: Crambinae) and turfgrass inhabiting insects of Virginia
Turfgrass is subject to attack by a variety of insect pests. However, there has been no research on the sod webworm pests associated with turfgrass in Virginia and little research on habitat preferences of other insect pests of turf. The purpose of this research was to contribute to the basic …
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Weeds in Sacramento County of California
… has many types of Agriculture and many weed pests which compete with the crops. Stock may be poisoned by certain weeds and weeds may also act as hosts for fungus diseases, virus diseases and insect pests of cultivated crops. Many plants may be weeds in one locality and harmless or beneficial …
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A new approach for delivery of entomopathogenic fungi for plant protection against insect pests and plant diseases via maize seed : A thesis submitted in partial fulfilment of the requirements for the Degree of Doctor of Philosophy at Lincoln University
… been recognized mainly for their ability to kill insects which has seen as an advantage for the development of these particular fungi as biocontrol agents in sustainable agriculture programmes. Recently, it was determined that some species of entomopathogenic fungi, including Metarhizium spp., …
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Callus Development and Organogenesis in Cultured Explants of Cowpea (Vigna unguiculata (L.) Walp
… Optimal production levels are hampered by insect pests and diseases. Biotechnological techniques such as tissue culture and genetic engineering can aid in the development of varieties with resistance to insect pests and diseases. The objective of this study was to investigate conditions …
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Novel methods of fumigating Australian wildflowers
… imposed by importing countries render insect-free flowers and foliage mandatory. Flower exporters have a number of options, currently fumigating just prior to export is a major one. At present methyl bromide or Pestigas®-Insectigas® (mixtures of pyrethrum in carbon dioxide and …
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Development of an integrated pest management strategy for the control of Maruca Vitrata on cowpea in Kebbi state of Nigeria
… based application of broad spectrum chemical insecticide (Mixture of 30g cypermethrin and 250g dimethoate) in Kebbi State of Nigeria. The study initially made use of a survey backed up by focus group interviews to gather information on the types of farmers’ cowpea cultivation practices, their …
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