The official announcement came through today. Coragen Insecticide is now also approved for use in dry beans and other legumes (except soybeans) for WBC control in Canada through the URMULE system. Rate is 250 to 375 mL/ha. Use a minimum of 100L/ha of water for ground app. 1 day PHI. Click link to see revised label: Coragen CG6 except soybeans E Label 2011.’
WBC management recommendations for dry beans will come later this week once we can determine if we have hit or are close to peak moth flight.
We are seeing heavy moth flights in fields that are going to be planted to tomatoes. Likely either cutworm or armyworm?
Is there any point in spraying something to reduce the amount of adults in an attempt to reduce further populations.
Identification of the moths will be important to determine if they are a problem or not. The black cutworm is a grey moth with small dagger markings on the forewings; the true army worm is a sand coloured moth with distinctive white spots on the centre of each forewing. Control of adult moths is not very effective and insecticide applications for the control of adult moths are not recommended. At this point scouting for cutworm larvae and the application of a well timed rescue treatment if there is a problem is the better option.
Can you advise what the aphid threshold is on winter wheat and what should be used as a control..
I have found some aphids in the wheat crop this year but I have also noticed a large number of lady beetles (particularly the spotted lady beetle) in and around some of the fields.
To scout for aphids, examine 5 stems in 20 areas of the field. Shake the plants over a piece of paper and count the number of aphids present or look for colonies around the leaf collar. Make note of any beneficials present as well as any parasitized aphids (aphids that are turning a golden in colour). In the spring, fields should be scouted weekly. Action thresholds prior to heading stage are 12-15 aphids per stem and up to 50 aphids per stem once the wheat is headed.
Typically aphid populations don’t develop into a serious a problem in wheat since beneficial insects do a good job of controlling them. There are some insecticides registered for the control of aphids in wheat but wait to see how the beneficials are managing the population before you consider using an insecticide.