Evaluation of naturally occurring parasitic Hymenoptera attacking silverleaf whitefly, Bemisia argentifolii in Texas /
accounted for 65% to 94% of whitefly mortality. There was a
| Main Author: | |
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| Format: | Thesis eBook |
| Language: | English |
| Published: |
[Place of publication not identified] :
[publisher not identified] ;
1996.
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| Subjects: | |
| Online Access: | Link to OAKTrust copy |
| Summary: | accounted for 65% to 94% of whitefly mortality. There was a analysis of E. Pergandiella, E. sp. nr. calijbrnicus and argentifolii. At least five species of aphelinid parasitoids cage comparisons of their impact on whitefly. Sampling cage effect against parasitoids finding the leaves in open cage treatments and there appears to be a significant changes in parasitoid complexes through time, and exclusion- collards were created in association with other plants to collected. Evaluation of these natural enemies emphasized contribution to whitefly mortality by other natural enemies, cotton plots. Parasitoid exclusion cage tests demonstrated a However, the effect of density on variance-mean ratios was Hymenoptera attacking silverleaf whitefly (SWF), Bemisia in the genera Eretmocerus and Encarsia were reared from the indigenous parasitoids to regulate whitefly populations in mass immigration of whitefly into refuges and untreated measurement of whitefly population densities and dispersion, nigricephala, E sp. nr. strenua and E. quaintancei were also not have a significant affect on variance-mean ratios. parasitoids than in their absence. Direct parasitism particularly predators. pergandiella; usually at low whitefly densities. Encarsia Pesticide-free refuge plantings of sunflower, kale and plantings. Measurements of total parasitism of 4th instar provide habitats for the conservation of parasitic readily moved from the refuges onto cotton and maintained significant and at high density, aggregation was significantly higher than at low or medium density levels. significantly lower whitefly survivorship in the presence of species changes over the season. Encarsia pergandiella was targeted well-developed 4th instar whitefly. Dispersion Texas. Data showed that millions of parasitoids were carried the dominant species and Eretmocerus sp. nr. californicus was the second most abundant species, at times outnumbering E the status of individual whitefly in these populations, These studies indicate there is great potential for through the harvest season. Parasitoids showed the ability through the winter months on relatively small refuge to respond to whitefly population increases resulting from whitefly demonstrated that insect species or plant alone did whitefly in south Texas. Relative abundance of parasitoid whitefly mortality greater than 94%. Parasitoid populations whitefly populations that never exeeded 7 whitefly per leaf whitefly reached 84% on kale, with corresponding total |
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| Item Description: | "Major subject: Entomology". Vita. |
| Physical Description: | x, 130 leaves : illustrations ; 28 cm. Also available online. Issued also on microfiche from Lange Micrographics. |
| Bibliography: | Includes bibliographical references. |