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WEEKLY UPDATES |
Weekly Soybean Field Crop Report - June 14, 2007
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Posted on
June 15, 2007 at 09:03:57
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Soybean
Much of the soybean crop looks to be in excellent shape with early planted soybeans at the 3rd to 4th trifoliate stage, while late planted soybeans have emerged, and are at the unifoliate stage. Some fields that were planted late, shallow, or in areas that are extremely dry are having emergence problems. Seed that has imbibed water and began to germinate and then ran out of moisture is only viable for about a week. Reseeding may be required in those fields if the stand is below 100,000 plants/acre. Seed that has remained dry and appears healthy will germinate after the next rain.
Weed control continues to be a priority during the 1st to 3rd trifoliate stage.
There have been reports of soybean aphids, which is earlier than normal. With the exception of a few localized areas with high aphid populations, the majority of scouted fields in Ontario have none to very low levels of soybean aphids. Fields that are the furthest advanced have the highest populations. A few fields in the Arva area have been sprayed. This should serve as a “heads up” for producers to monitor their fields over the next several weeks, as above threshold aphid populations at the R1 (beginning bloom) to R5 (beginning seed) stage of soybean development will require management. Caution: spraying early before aphids reach threshold numbers, will also control beneficial predators that could result in higher populations of aphids later in the season. The threshold for soybean aphids is to “take action if populations are actively increasing above 250 aphids per plant on 80% of the plants from the R1 to R5 stage of soybeans”.
- Submitted by Horst Bohner, OMAFRA Soybean Specialist
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