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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Colonization of wheat fields by L. Impacts 1 Soybean aphid populations were at historic lows in the fields we monitored, with peak numbers less than 50 per plant. Parasitized greenbugs stop reproducing within days, while healthy greenbugs give birth to live greenbugs a day for days.

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.

However, the distinctive aphid mummies which remain on leaves after the parasitoid has killed the greenbug can easily be detected. The parasitoid Lysiphlebus testaceipes Cresson; Hymenoptera: However, preliminary evidence suggests levels of parasitism by L. Then the wasp grub molts to the pupal stage, and after days a wasp emerges by cutting a circular hole in the top of the mummy.

The higher rate recorded in was due to low aphid densities as well as the contributions of an Aphelinus species Hymenoptera: Movement of the wasp grub inside the aphid expands the aphid, giving it a swollen appearance.

Midwest Biological Control News

Developmental rate at each temperature will be regressed against temperature, and the developmental threshold will be estimated. At each visit a variety of native plants were examined for aphids and aphid mummies containing parasitoid pupae. In addition, we collaborated with farmers who graciously allowed us access to their soybean fields. Correlations between parasitism and landscape variables that would be expected to increase with increasing landscape diversity were usually positive.

A major effort toward biological control of the soybean aphid was also launched, which has sought to import and establish “parasitoids” to help control soybean aphid populations. Pages People more options.

Pesticide testadeipes in wheat or grain sorghum may decrease activity of these parasitic wasps. Determine the host range of Lysiphlebus testaceipes and the preference of Lysiphlebus testaceipes for selected aphid hosts. Another target is the community of UW researchers and extension specialists with interest in soybean aphid management and in organic agriculture. These locations were visited and sampled biweekly from June through August to estimate densities of soybean aphids and L.


Correlations between parasitism and landscape variables were generally greatest at a 3. Parasitoid development was slightly slower in soybean aphid than in the other two aphid hosts at all temperatures. 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 testacei;es to agroecosystem diversity also influence biological control of common aphid pests.

There are two reasons parasitoids rather than predators, the other type of natural hestaceipes often used in biological control efforts were targeted for importation lysiphlebys establishment against the soybean aphid: Habitat Crops Wheat and grain sorghum.

Biocontrol Agent Profile

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 tetaceipes 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.

Experimental protocols will follow those used by Desneux et al. As many as thirteen aphid species will testaceieps tested to determine their acceptability and suitability as hosts of Lysiphlebus testaceipes. Thus the target audience includes soybean farmers, but only indirectly testxceipes in the longer term.

In addition, the aphid is known to transmit several viruses that are pathogens of soybeans. A third target is entomology colleagues who reside in other states and regions and who have interests in insect pest management and biological control in field crops and organic cropping systems. Citing articles via Google Scholar. Plants were identified using field guides, aphids were collected and returned to the laboratory for identification, and mummies were returned to the laboratory to hold for adult emergence and parasitoid identification.

Thus wasps may not be effective in controlling greenbugs in wheat in the fall and spring due to cool weather. However, the shorter residual activity of methyl parathion allows parasites to recolonize a field sooner after treatment. Pesticide Susceptibility Pesticide use in wheat or grain sorghum may decrease activity of these parasitic wasps.


How to Manage Pests

Aphidiinae is highly effective at reducing aphid populations in wheat in Oklahoma, and though a great deal is known about the biology and ecology of L. 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. We also took advantage of several opportunities to report on this research at farmer field days.

Thus the target audience includes soybean farmers, but only indirectly and in the long term. Each field will be sampled at weekly or biweekly intervals, with the following information recorded on at least 25 soybean plants: The wasp grub completes feedings in about days, resulting in the death of the aphid.

A small testacekpes of specimens tentatively identified as L.

Lysiphlebus testaceipes

This project provided the opportunity for Ms. All mummies will be collected and returned to the laboratory to be reared to determine for each mummy species primary lysuphlebus. Available commercially see the off-site publication, Suppliers of Beneficial Organisms in North Americapage of the California Department of Pesticide Regulation website.

Email alerts New issue alert. A fungicide triadimefon; Bayleton used to control leaf rust in wheat is also very toxic to adult wasps. It furthers the University’s objective of excellence in research, scholarship, and education by publishing worldwide.

Wasp parasites contribute to greenbug suppression in two ways. All these aphids are known tedtaceipes of L. Impacts A total of 12 confirmed Lysiphlebus testaceipes were collected during Soybean aphid was reared on soybean plants and both greenbug and corn leaf aphid were reared on barley plants. Project Methods Objective 1: Oxford University Press is a department of the University of Oxford. Both no-choice and choice assays were conducted. Thus testacepes is conceivable that Lysiphlebus testaceipes is adapting to take advantage of the availability of the recently introduced soybean aphid.