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 8 of 8 for “"first instars"”.
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Morphology and taxonomy of the first instars of the genus <i>Cerococcus</i> Comstock (Homoptera:Coccoidea:Cerococcidae)
… for identification. This detailed study of the first instars is one step in the revision of the genus and reevaluation of the taxa which have been referred to the genus. The first instars of 31 species of <i>Cerococcus</i> are included in this study. Each species studied is fully described, …
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Life History and Case Building Behaviors of Phylloicus ornatus (Banks) (Trichoptera: Calamoceratidae) In Two Spring Fed Tributaries in the Central Edwards Plateau Bioregion of Texas
… of Phylloicus ornatus from two springfed first order streams in the Edwards Plateau Bioregion of Texas were studied from January 1998 to November 1999. Field larval, pupal and adult samples and laboratory rearings indicated a multivoltine cycle. First instars differ from late instars in …
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Biology and ecology of Frumenta nundinella (Zeller) (Lepidoptera: Gelechiidae) and its impact on horsenettle (Solanum carolinense L.)
… The larvae attack the plant in two ways: first instars web the terminal leaves together and form a round hollow chamber within which they feed on the growth tip of the plant, or they enter berries and consume all of the seeds. There are two generations per year, each being about 50 days. …
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Reproduction and development of the black vine weevil (Coleoptera: Curculionidae) in relation to environmental factors
… may alter the reproduction of their hosts. I first documented that Wolbachia is highly prevalent in O. sulcatus populations in the United States. Given that two antibiotics (tetracycline and gentamicin) differing only in their efficacy against Wolbachia, results strongly support the hypothesis …
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Biological and ecological studies of Hydrotaea aenescens (Wiedemann) (Diptera: Muscidae), and other arthropods of high-rise cage layer poultry houses
… high predation rates on house fly eggs and first instars, their effectiveness 1s reduced by their spatial separation from their supposed prey. This contrasts greatly with H. aenescens performance. Decreases in survival of house fly larvae occurred when the larvae were exposed to H. aenescens …
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Ecological and behavioral factors associated with monitoring and managing pink hibiscus mealybug (Hemiptera: Pseudococcidae) in the southern US
… Aerially dispersing PHM were predominantly first instars. Dispersal occurred with a diel periodicity that peaked between 14:00 and 18:00 h and was significantly influenced by mean wind speed. Initial infestation with 5, 10, or 20 PHM adult females had no significant affect on the number of …
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Toxicity of mycotoxins to insects and underlying molecular and biochemical mechanisms
… than that for H. zea. Similarly, A. transitella first instars display substantially higher tolerance of ochratoxin A (OTA) than do H. zea. Honey bees and their resource-rich nests are hosts to a wide range of saprophytic fungi, including species that produce mycotoxins. Bioassays showed that the …
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Modeling insect resistance to transgenic corn and cowpea
… when toxin mortality is distributed across the first two larval stadia than when only the first instars are susceptible to Bt toxins. The study suggested that stakeholders should examine toxin-survival rates for insect pests and take into account that instars may feed on different parts of Bt …