PDF | Fauna of aphidiine parasitic wasps has been intensively studied in the past 20 years in Serbia. Lysiphlebus testaceipes, a species introduced originally to. The aphid parasitoid Lysiphlebus testaceipes is a potentially valuable biological control agent of Aphis gossypii a major worldwide pest of cotton. One means of. Lysiphlebus testaceipes, a native parasitoid with an unusually broad host range of over aphid species, has become increasingly abundant, to the point that.

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This project provided the opportunity for Ms. Samples are still being processed to determine final numbers. A project was initiated to characterize aspects of the biology of the native parasitoid parasitic wasp Lysiphlebus testaceipes in the north central U.

Aphidiinae Aphidiid wasps attack only aphids.

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Relative Effectiveness Wasp parasites contribute to greenbug suppression in two ways. Specific objectives will investigate 1 the development and resulting sex ratio of Lysiphlebus testaceipes in relation to temperature, 2 the host range of Lysiphlebus testaceipes, including its preference for selected aphid hosts relative to the soybean aphid, 3 the dynamics of Lysiphlebus testaceipes field populations including the impact of the parasitoid on reducing soybean aphid populations, and 4 the aphid host species utilized by Lysiphlebus testaceipes to pass the winter as a pupa within the aphid mummy.

However, we have observed an interesting phenomenon over the past few years in southern Wisconsin. Thus the target audience includes soybean farmers, but only indirectly and in the longer term. The aphids tested will include corn leaf aphid, English grain aphid, bird cherry oat aphid, green peach aphid, potato aphid, pea aphid, and a variety of other aphids in the genus Aphis, many of which occur on native prairie plants.


Allison Dehnel, graduate student and research assistant, has primary responsibility for the conduct of the research. Genetic Structure of Liriomyza trifolii Diptera: A field survey will again be conducted during Thus, the activity of these wasps can greatly reduce the rate of greenbug increase. Nothing significant to report during this reporting period.

How to Manage Pests

Colonization of wheat fields by L. Project Methods Objective 1: Host preference tests will be conducted as pairwise choice experiments involving the soybean aphid and selected species based on the outcome of host suitability testing. Pages People more options. Overall, results indicate that L.

The higher rate recorded in was due to low aphid densities as well as the contributions of an Aphelinus species Hymenoptera: Arlington, Lancaster, and West Madison. However, the distinctive aphid mummies which remain on leaves after the parasitoid has killed the greenbug can easily be detected.

Natural Enemies Gallery: Lysiphlebus testaceipes–UC IPM

West Madison and Lancaster, but in this case sampling was done on a weekly basis from mid-June through Testaceiprs. In addition, we collaborated with farmers who graciously allowed us access to their soybean fields.

Thus wasps may not be effective in controlling greenbugs in wheat in the fall and spring due to cool weather. There is direct mortality caused by the wasp parasitism, but, in addition, parasitized aphids have reduced reproductive rates.

Significant correlations between parasitism by L.

These were found from mid-June through early July, and all at the Lancaster and West Madison locations. As many as thirteen aphid species will be tested to determine their acceptability and suitability as hosts of Lysiphlebus testaceipes. Pesticide use in wheat or grain sorghum may decrease activity of these parasitic wasps.


Correlations between parasitism and landscape lysiphkebus were generally greatest at a 3. Soybean aphid was reared on soybean plants and both greenbug and corn leaf aphid were reared on barley plants. Parasitoid development was slightly slower in soybean aphid than in the other two aphid hosts at all temperatures. The parasitoid colony lyxiphlebus be maintained using soybean aphid as its host.

Determine the host range of Lysiphlebus testaceipes and the preference of Lysiphlebus testaceipes lysiphleus selected aphid hosts. Both no-choice and choice assays were conducted. As expected, all sex ratios were female biased. Allison Dehnel, graduate research assistant in Entomology, had primary responsibility for coordinating and conducting the research.

Winter wheat fields are typically interspersed in a mosaic of habitats in other uses, and we hypothesized that the spatial and temporal composition and configuration of landscape elements, which contribute to agroecosystem diversity also influence biological control of common aphid pests. Any mummies remaining in a soybean field would be crushed during the harvesting procedure, and the soybean aphid leaves soybean in the fall and colonizes buckthorn, where males and sexual females mate and the females lay overwinter eggs.

The dynamics of Lysiphlebus testaceipes in relation to aphid numbers and other natural enemies will be inferred from the patterns that emerge across the various sites. Publications No publications reported this period.

In choice assays, parasitoids were presented with 50 aphids of each host aphid on their respective host plants in the same cage.