Soybean Aphids are Starting to
Colonize Soybeans
| Author: |
Tracey Baute - Field Crop Entomologist/OMAFRA
- Ridgetown |
| Creation Date: |
06 June 2008
|
| Last Reviewed: |
06 June 2008
|
Scouting efforts on June 6, 2008 found a low incidence of aphids in one
field (3 aphids on one plant in 100 examined). This field in Arva was
planted early and has reached the first trifoliate stage. Scouting of
other fields in the area did not detect the presence of soybean aphids
in any other fields. Overall the incidence of soybean aphids to date is
low in Ontario but early planted fields should be scouting in the next
few weeks to ensure that SBA populations do not increase in these fields.
The field found today in Arva was directly across from a plot that last
year was colonized with SBA by May 10th and was sprayed by June 11th last
year because the aphid population had reached threshold. The observations
made today indicate that we are no where close to what we experienced
last year but is more typical of a normal year when populations are noticed
on soybeans near second week of June (9th -14th) time period. The most
likely source for these aphids is from buckthorn in the area (local) and
not dispersal from distant locations (wind). Michigan State University
(Chris DiFonzo) has also found a site with soybean aphids on plants but
the Michigan site has a much higher incidence (60% of plant infested with
soybean aphids).
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