| dc.contributor.author | Hochhalter, Julie | |
| dc.description.abstract | The soybean aphid, Aphis glycines Matsumura (Hemiptera: Aphididae), is a major
pest of soybean (Glycine max L.). This aphid is a native of Asia and was first discovered in
the United States in Wisconsin in July 2000, and in North Dakota in summer 2001.
Management of the soybean aphid varies across the geographical range of the pest. The
impact of the soybean aphid has been less in North Dakota compared to many areas of the
Midwest. One reason is environmental conditions in North Dakota limits population
growth of the soybean aphid. Another is that until recently the area of soybean hectares in
North Dakota has been limited. But now production has increased and growers are
expecting integrated pest management programs designed specifically for North Dakota
conditions. This research addresses how insecticides and resistant soybean cultivars might
be used to control North Dakota populations of the soybean aphid.
The objective of the first study was to determine efficacy of foliar and seed
treatments for controlling the soybean aphid. Effects on beneficial insects were also
determined. The foliar insecticide lambda-cyhalothrin (Warrior) was applied to soybean at
different plant growth stages. The seed treatment thiamethoxam (Cruiser Maxx) was
applied alone and in combination with the foliar insecticide lambda-cyhalothrin (Warrior).
A foliar application of lambda-cyhalothrin (Warrior) applied at the economic threshold of
250 aphids per plant was the most effective control method. Seed treatments were not effective, probably because insecticidal effects had declined by the time aphids were
invading the crop.
The objective of the second study was to evaluate experimental soybean lines for
resistance to soybean aphid. The first experiment was conducted in the greenhouse and
involved 436 soybean lines. The second experiment included 30 susceptible lines and 25
resistant soybean lines at two field sites. The third experiment included the same lines that
were evaluated in the field, but this screening was conducted in the greenhouse and
involved caging aphids. In general, ranking of the lines for resistance was consistent
between the first greenhouse experiment and the field experiment, suggesting that
greenhouse screening is an effective method for scoring soybean lines for resistance and
can be used to accelerate progress in soybean breeding programs. Five experimental lines,
known to have the Ragl gene that confers resistance to soybean aphid, maintained aphid
levels below the economic injury level. The economic injury level is 674 aphids per plant
when the plant is at the reproductive stages. The third experiment, which caged aphids on
leaves of susceptible and resistant lines in the greenhouse, was not an effective method for
scoring resistance. | en_US |
| dc.publisher | North Dakota State University | en_US |
| dc.rights | NDSU policy 190.6.2 | en_US |
| dc.title | Integrated Pest Management of Soybean Aphid (Aphis glycines) in North Dakota | en_US |
| dc.type | Thesis | en_US |
| dc.date.accessioned | 2024-03-04T19:35:36Z | |
| dc.date.available | 2024-03-04T19:35:36Z | |
| dc.date.issued | 2010 | |
| dc.identifier.uri | https://hdl.handle.net/10365/33704 | |
| dc.subject.lcsh | Soybean -- Diseases and pests -- Integrated control -- North Dakota. | en_US |
| dc.subject.lcsh | Aphids -- Control -- North Dakota. | en_US |
| dc.subject.lcsh | Aphids -- Control. | en_US |
| dc.rights.uri | https://www.ndsu.edu/fileadmin/policy/190.pdf | en_US |
| ndsu.degree | Master of Science (MS) | en_US |
| ndsu.college | Agriculture, Food Systems and Natural Resources | en_US |
| ndsu.department | Entomology | en_US |
| ndsu.program | Entomology | en_US |
| ndsu.advisor | Harris, Marion O. | |
