What Moths Prefer– Moths prefer laying their eggs in corn before it tassels. After the crop is in tassel, it will prefer neighbouring fields that are less advanced in crop stage OR they move to dry beans and other host crops (like snap beans, sweet corn etc). Pick the tallest and healthiest looking fields that are not quite tasseling yet….
Several wheat fields were found with grass sawfly north of London from Hyde Park to Kintore and St. Marys. Damage averaged anywhere from 3 heads clipped per square meter to 30 heads clipped per square meter! Reports have also come in from Rodney, Glencoe, Molesworth, Brussels and now northern Huron County. Scout fields to determine if sawfly is present. All…
I have heard reports now from a few different locations of both wheat heads being clipped and leaf feeding taking place in corn in southwestern Ontario. This is a good sign that true armyworm is present. Both wheat and corn fields need to be scouted to determine if armyworm is present. Here is an article from last year’s CropPest Newsletter…
Tracey Baute October 14, 2009 1334 Comments Off on More Western Bean Cutworm Damage Sightings to Add to the ListMore reports of WBC damage are coming in. Here is an updated list of sites with damage and or larvae found in Ontario: Chatham- Kent (Dover Centre, Bothwell) Lambton (Petrolia) Middlesex (Wardsville, Appin, Glencoe) Elgin (Rodney) Huron (Blyth, Clinton, Exeter, Dashwood, Holmesville, Belgrave) Bruce (Walkerton, Kincardine) Simcoe (Alliston, Barrie, Stayner) Durham (Kinsale, Lindsay, Brooklin) Victoria (Dunsford) Peterborough (Millbrook) Dundas (Chesterville)…
Tracey Baute October 2, 2009 1397 Comments Off on More Reports of WBC Damage – Scout and Let Me KnowSorry…It’s been a few weeks since my last blog but I finally went on holidays. I’m back and want to give you an update. While away, more reports were coming in of western bean cutworm damage being found in Ontario. Others are asking how to scout for the damage this fall so that they can determine if they have WBC. So here…
Tracey Baute September 11, 2009 1299 Comments Off on Until Mid R6, Soys Still Need Attention – Aphids, BLB and Stink BugsThere are a few guys out there thinking that with the cooler nights, SOYBEAN APHIDS will be leaving their fields so they don’t need to spray those fields that recently reached threshold. If aphids are staying at threshold levels 3 or 4 days after the initial assessment, you still need to spray. Only those fields that are dropping in numbers or…
We visited the Newbury WBC site last week and it was concerning to see so many plants infested with WBC larvae. There were no external entry holes from the outside of the ear which could fool those who think the ears are clean. Pay extra attention to those ears that are slightly opened at the ear tip (husk not tightly closed) and if the…
Tracey Baute August 26, 2009 1302 Comments Off on First Western Bean Cutworm Larvae Found in OntarioMy summer students are going to be frustrated when they find this out, especially with all of the scouting they have done looking for WBC egg masses and larvae and finding nothing to show for it. But today Adam Pfeffer of Monsanto brought in the first WBC larvae found here in Ontario. The larvae was from a corn field in Rodney…
I have had a few calls from some reps and growers who have been amazed and delighted and some who have been frustrated and frazzled this week. But I’m in it with you, believe me. Soybean aphids seem to be very active right now, developing winged generations and have been moving from one field to another for the last two to three…
Some counties in Michigan have been given the recommendation to spray their dry beans due to the high moth counts and observations of pod feeding at some locations. Montcalm County (central Michigan) in particular is at the highest risk with some trap sites capturing over 400-500 moths in the last few weeks. Isabella, Gratiot and Mecosta counties are also considered at risk. Current Michigan WBC…
I have been getting more calls this week with people wanting to spray the aphids just to take care of them..even if they are not at threshold. Most realize that the natural enemies are going to get killed but they also assume 100% kill of the aphids and struggle to understand how the aphids can build back up so quickly…
A recent summer migration of soybean aphids in Ontario has resulted in many new fields having a fair number of aphids in them now. Fields that were scouted a week or two ago and were found to have very few aphids could now be closer to threshold than you think. Scouting is advised. Scout Cruiser treated fields too as we…
SPIDERMITES: I have a sneaking suspicion that spidermites are making their way into those fields that haven’t had rain in a while. We have had situations in the past where not only have they popped up in soybeans and were being disregarded as “drought stress” symptoms but also in seed corn, especially around or just after wheat has been harvested in…
A lot of calls are coming in this week from growers and reps who have fields that are hovering around the 250 aphids per plant range. With the poor weather and wheat harvest some are anxious to make the call if they need to spray. In fact, there are some rumours out there that some are spraying before the field reaches 250…
This is a ladybeetle larvae. They can be black or a dull grey/purple with orange or yellow markings. If they are shaped like an alligator, they are a ladybeetle larvae. It will be an adult ladybeetle soon. Both the larvae and adults feed on aphids. The black velvet coloured aphid on the right is a parasitized soybean aphid. It…