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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Determine the host range of Lysiphlebus testaceipes and the preference lysihplebus Lysiphlebus testaceipes for selected aphid hosts. Colonies of greenbug and cotton aphid were initiated with individuals from established colonies in other laboratories.
Another target is the community of UW researchers and extension specialists with interest in soybean aphid management and in organic agriculture.
Publications No publications reported this period. Correlations between parasitism and landscape variables were generally greatest at a 3. As many as thirteen aphid species will be tested to determine their acceptability and suitability as hosts of Lysiphlebus testaceipes. Research in Texas has shown the methyl parathion and chlorpyrifos are more toxic to adult wasps and to immature wasps inside greenbugs than systemic testaceipe such as lyziphlebus or disulfoton, especially at lower rates.
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Midwest Biological Control News
The newly emerged wasp mates, and then begins to search for new aphids to attack. The larva cuts a hole in the bottom of the aphid, attaches the aphid to a leaf with silk and a glue, and the dead greenbug changes color from green to a brown “mummy”. Project Methods Objective 1: In the short term the target audience includes others conducting research on soybean aphid management, including biological control, and those studying parasitoid behavior and ecology, and tedtaceipes control of other aphid species.
Citing articles via Google Scholar. Correlations between parasitism and landscape variables that would be expected to increase with increasing landscape diversity were usually positive.
Periodic sampling of soybeans will be conducted in various geographic regions in Wisconsin. Parasitoid development was slightly slower in soybean aphid than in the other two aphid hosts at all temperatures.
Parasitized greenbugs stop reproducing within days, while lysiphlebux greenbugs give birth to live greenbugs a day for days.
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Our objective was to determine the influence of landscape structure on parasitism of cereal aphids by L. Thus wasps may not be effective in controlling greenbugs in wheat in the fall and spring due to cool weather. All these aphids are known hosts tesatceipes L.
Project Director Hogg, D. Characterize the within-season dynamics of Lysiphlebus testaceipes field populations on soybean aphid, including the impact of hyperparasitoids. These locations were visited and sampled biweekly from June through August to estimate densities of testaceies aphids and L.
Lysiphlebus testaceipes, a native parasitoid with an unusually broad host range of over aphid species, has become increasingly abundant, to the point that in this parasitoid appeared to be limiting the increase of soybean aphid populations early in the growing season.
The female wasp inserts an egg into the greenbug and in about 2 days a tiny wasp grub hatches and feeds internally on the living aphid. The overall objective of this research was to gain a better ylsiphlebus of the behavior and ecology of a native aphid parasitoid, in hopes that we might better be able to utilize it for biological control of the the exotic soybean aphid.
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Thus the target audience includes soybean farmers, but only indirectly and in the long term. The objective of this research is to gain a better understanding of the behavior and ecology of a native aphid parasitoid, in hopes that we might better be able to utilize it for biological control of the the exotic soybean aphid.
Temperature is an important factor influencing the efficacy of wasps as biological controls of greenbugs. It seems likely that Lysiphlebus testaceipes leaves soybeans late in the season and finds one or more species on which to overwinter. Thus, no useful data on aphid population dynamics were obtained during Determine the developmental rate and resulting sex ratio of the immature stages of Lysiphlebus testaceipes in relation to temperature.
Natural Enemies Gallery: Lysiphlebus testaceipes–UC IPM
We also took advantage of several opportunities to report on this research at farmer field days. Both no-choice and choice assays were conducted. Soybean aphid was reared on soybean plants and both greenbug and corn leaf aphid were reared on barley plants.