District 1 of the Ontario Processing Vegetable Growers and OMAFRA present……. The 42nd Annual Tomato Day
Friday, March 2, 2018 8:30 am – 3:30 pm
19 Seacliff Drive E., Leamington, ON Admission: $30 (includes educational program, trade show, hot lunch). No preregistration required.
The program schedule for the Ontario Fruit and Vegetable Convention is mind boggling. With over 36 different sessions and 144 different presentations, you can be forgiven for not knowing exactly where to start.
By Anne Verhallen, Soil Management Specialist (Horticulture)
Every time I see a bare field this time of year I just think – what a missed opportunity – an opportunity to get a cover crop in and build soil. Cover crops should be a key part of any soil maintenance package. Adding a cover crop into the rotation not only protects the soil over winter but also adds to the length of time that the soil has an active living root system.
Active and living are the key here. Roots take in water and nutrients from the soil but don’t forget plant roots continuously slough off and they also produce and secrete compounds back into the soil. These are called root exudates. These exudates can be waste materials from plant processes or they can be compounds with a known function like lubrication or defence. Research has shown that, in their own way plants continuously communicate with other plants and other organisms, often through these root exudates.
Job Ad: 2018 Horticulture Crop Summer Student Field Research Assistant Positions (up to 3 positions in Ridgetown) Organization: Ontario Ministry of Agriculture, Food and Rural Affairs
Position Title: Summer Student Field Research Assistant Job Term: Temporary for 16 – 18 weeks Location: Ridgetown, ON Salary: $14.85/ hour, based on a 36.25 hour work week Closing Date: February 2, 2018
Corn earworm pressure often increases as we head into September. With turbulent weather patterns originating in the Gulf of Mexico, flights of airborne moths are generally quite high. As the tradewinds mix with the cooler air of the great lakes, these high populations are dropped into Southern Ontario. Any sweet corn at the green silk stage is highly susceptible to corn earworm infestation.
For earworm control, cover green silks with an insecticide such as Coragen or Voliam Express. Avoid insecticides from the pyrethroid family. Corn earworm are known to be resistant to the pyrethroids. Lannate TNG is a good rotational partner for Coragen and Voliam Express.
This information is updated from an earlier article by Janice LeBoeuf.
We have had multiple reports of late blight in conventionally managed tomato fields this week. Typically, this disease is well managed in tomatoes with a broadspectrum fungicide program including chlorothalonil. However, high disease pressure due to environmental conditions, combined with a dense leaf canopy and rapid growth may have resulted in poor spray coverage and reduced efficacy.
Commercial growers should scout often and ensure they are using fungicides with good late blight activity in their fungicide program. When late blight is in the area, spray intervals should be shortened.
Under continued high disease pressure, growers should consider adding a targeted late blight fungicide to the spray program. If late blight has been identified in a field, use a fungicide with curative and antisporulent activity, see the table below for late blight fungicides and their properties. Continue reading Late blight alert – July 27th, 2017→
This is a re-post from 2016 – Late-July to early-August is the key time for powdery mildew management! With any disease, preventative management provides the best control.
Powdery mildew typically arrives in Southern Ontario in mid-to-late July. Plants are most susceptible to infection during the fruit sizing and development. Poor control results in decreased yield and poor fruit quality at harvest. The threshold for treatment is 1 lesions/50 plants. Optimum powdery mildew control is a combination of variety selection, fungicide timing and fungicide selection.
Cheryl Trueman, a vegetable pest management researcher at the University of Guelph’s Ridgetown Campus, has been conducting powdery mildew efficacy trials since 2009. In these trials, several products consistently provided good control of powdery mildew. These products are powdery mildew targeted, and have a single site mode of action. To prevent the development of resistance, it is essential to always rotate between different fungicide groups and/or tank mix with a broad spectrum fungicide.
Powdery Mildew Targeted Fungicides Showing Consistent Control in the Ridgetown Field Trials:
Group 13: Quintec (quinoxyfen)
Quintec was the most consistent powdery mildew product tested in Ridgetown. It provided excellent control in 4/5 years and good control in 1/5 years tested.
Group U8: Vivando (metrafenone)
Vivando provided excellent control in 1/3 years and good control in 2/3 years and tested.
Group 7: Fontelis (penthiopyrad), Aprovia (benzovindiflupyr), Sercadis (fluapyroxad) and Pristine (boscalid/pyraclostrobin).
Fontellis was somewhat less consistent. Control with this produce ranged from excellent to poor, depending on the year. It provided excellent control in 1/5 years, good control in 2/5 years and poor control in 2/5 years. Note: Aprovia, Sercadis and Pristine were not tested in the Ridgetown Campus trials.
Group 3: Inspire (difenoconazole), Proline (prothioconazole) and Quadris Top (azoxystrobin/difenoconazole)
Inspire provided a level of control similar to Fontelis; good control in 3/5 years, and poor control in 2/5 years. Proline and Quadris Top were only tested for one year in the Ridgetown trials, in which they both provided good control.
Fungicides containing chlorothalonil(Bravo ZN and Echo) provided a lower level of powdery mildew control, but are still better than the untreated checks. They also control a broad range of other foliar diseases including scab and alternaria.
Research in Ontario and other jurisdictions indicates that the group 11 (QoI) fungicides, Cabrio (pyraclostrobin) and azoxystrobin (a component of Quadris Top) no longer control powdery mildew. However, they may provide control of other cucurbit diseases such as anthracnose and alternaria.