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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Entomologists in the North Central Region of the U. Impacts 1 Soybean aphid populations were at historic lows in the fields we monitored, with peak numbers less than 50 per plant. Developmental rate at each temperature will be regressed against temperature, and the developmental threshold will be estimated.
Periodic sampling of soybeans will be conducted in various geographic regions in Wisconsin. 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 testaceipex of Lysiphlebus testaceipes field populations including the impact of the parasitoid on reducing soybean aphid populations, and 4 the aphid host species tesaceipes by Lysiphlebus testaceipes to pass the winter as a pupa within the aphid mummy.
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.
At least one field will be used in each of 4 regions: Sign In or Create lysiphlebjs Account. Thus, the activity of these wasps can greatly reduce the rate of greenbug increase.
Parasitoids were reared at constant temperatures of 12, 16, 20, 24, or 28 degrees C.
As many as thirteen aphid species will be tested to determine their acceptability and suitability as hosts of Lysiphlebus testaceipes. This project provided the opportunity for Ms.
Third, a field survey was conducted at three prairie sites in or near Madison, each of which was visited on one to five occasions. The parasitoid colony will be maintained using soybean aphid as its host. As expected, all sex ratios were female biased. Determine the overwintering host s utilized by Lysiphlebus testaceipes. Impacts A total of 12 confirmed Lysiphlebus testaceipes were collected during Relative Effectiveness Wasp parasites contribute to greenbug suppression in two ways.
However, the shorter residual activity of methyl parathion allows parasites to recolonize a field sooner after treatment. In no-choice assays, parasitoids were presented with individuals of a single aphid species on the appropriate plant. Time to mummy formation and to adult wasp emergence will be recorded, and the sex of each emerging parasitoid determined.
Movement of the wasp grub inside the aphid expands the aphid, giving lysihplebus a lysipblebus appearance. Insecticides applied as sprays will kill adult wasps as well as immature wasps developing inside greenbugs killed by insecticides. Allison Dehnel, graduate student and research assistant, was responsible for the conduct of the research.
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Greenbugs parasitized by L. Hyperparasite attack may reduce the effectiveness of L. Nothing significant to report during this reporting period. Correlations between parasitism and landscape variables that would be expected to increase with increasing landscape diversity were usually positive.
There are two reasons parasitoids rather than predators, the other type of natural enemy often used in biological control efforts were targeted for importation and establishment against the soybean aphid: In the short term the target audience tewtaceipes others conducting research on soybean aphid management, including biological control, and those studying parasitoid behavior and ecology, and biological control of other aphid species.
Many of these aphids are known to be hosts of the parasitoid in other locations. Any mummies remaining in a soybean field would be crushed during tetaceipes harvesting procedure, and the soybean aphid leaves soybean in the fall and colonizes buckthorn, where males and sexual females lusiphlebus and the females lay overwinter eggs.
Receive exclusive offers and updates from Oxford Academic. It seems likely that Lysiphlebus testaceipes leaves soybeans late in the season and finds one or more species on which to overwinter. Correlations between parasitism and landscape variables were generally greatest at a 3. Thus, no useful data on aphid population dynamics were obtained during It furthers the University’s objective of lysiiphlebus in research, scholarship, and education by publishing worldwide.
Temperature is an important factor influencing the efficacy of wasps as biological controls of greenbugs.