This spring’s challenging planting conditions has resulted in quite a few of uneven canola stands with both reduced populations and delayed emergence. This has some growers weighing the merits of applying a fungicide this season. Sclerotinia incidence varies greatly between fields and years thus making routine spraying of fungicide unprofitable. However when the risk of […]
Co-Authored by: Albert Tenuta, OMAF & MRA Field Crop Pathologist The OMAF and MRA Field Crops team has recently completed a survey of the 2013 Ontario corn crop to determine ear mould incidence as well as the occurrence of mycotoxins in the grain. These mycotoxins, particularly vomitoxin (DON) produced primarily by Gibberella/Fusarium ear moulds can […]
Co-Author: Albert Tenuta, OMAFRA Field Crop Pathologist The annual corn ear mould and vomitoxin survey by the OMAFRA Field Crops team indicates that the 2012 Ontario corn crop is distinctly low in ear moulds and vomitoxin. However, stakeholders are reminded that individual field conditions (environmental, hybrid, tillage, rotation, etc.) are important in ear mould and […]
The University of Guelph Pest Diagnostic Clinic confirmed this week Soybean Vein Necrosis Virus (SVNV) infection in soybean plants OMAFRA collected in Kent and Elgin counties last week. SVNV is a new soybean disease which was first identified in Tennessee in 2008. Since then the disease has been reported in many other States and most […]
In Ontario there are many root/stem diseases which cause wilting symptoms in soybeans. With the hot, dry conditions this year over much of the province some of these diseases such as stem canker, Fusarium wilt, charcoal rot have taken advantaged of the additional stress. Fusarium wilt or blight of soybeans can affect soybeans at any […]
I have had a lot of questions concerning Soybean cyst nematode and rhizoctonia in soybeans recently. In terms of SCN, remember the primary SCN symptom is often no above ground symptoms at all. Growers are advised over the next few weeks to scout for SCN by carefully digging-up plants, gently remove the soil from the […]
The hot, dry weather conditions to date have not been very conducive to foliar leaf diseases across most of the province. In most cases, besides high relative humidity, prolonged wet conditions on the leaves are necessary for infection but only under favourable temperatures (16-30oC). What has started to show recently in the southwest are the […]
Application of fusarium control fungicides requires specialized nozzles or nozzle combinations to achieve optimum results. Maximizing wheat head coverage requires both proper timing and the best nozzle configurations. Maximize Spray Coverage of Wheat Heads The key to applying fungicides to prevent fusarium head blight (FHB) is to spray all sides of all wheat heads with […]
There are many different diseases which are caused by various fungal pathogens that affect cereals in Ontario. The foliar diseases (powdery mildew, leaf rust, Septoria leaf spot, Septoria (Stagonospora) glume blotch and tan spot) and Fuarium Head Blight (FHB) can cause significant yield losses if not managed correctly. Although these diseases occur in all […]
Septoria Brown Spot in Soybeans Septoria Brown spot is caused by the fungal pathogen Septoria glyines and under normal conditions, the disease does not cause major yield loss in Canada. Were yield losses have occurred in the past is when the soybean plants are under prolonged stress conditions. This can result in premature defoliation which […]
Co-Authored by: Albert Tenuta In the past several weeks increased attention has been given to the potential for ear moulds in the 2011 corn crop and the mycotoxins potentially associated with these moulds. These mycotoxins, particularly the vomitoxin (DON) can be disruptive when fed to livestock, especially hogs. To increase our understanding of the situation […]
May 2011 has been one of those wet starts to the growing season. Wet and warm weather provides good disease growing conditions. Disease pressure makes for poor spring cereal yields and grain quality. Is Fungicide Always Warranted? The question is, “when are fungicides warranted on spring cereals?” Timing application to the crop stage impacts the […]
The conditions this year have resulted in a number of soybean diseases starting early and northern stem canker is one such disease. In most years, stem canker symptoms become apparent later in the seasonafter flowering. This year stem canker started earlier with seedling damping off and early season wilting symptoms which is as stated above […]
The following harvest and storage management tips for dwarf bunt infected fields can help increase sample quality: Cut high with the combine Wheat infected with dwarf bunt will be substantially shorter than healthy plants. Raising the header will reduce the amount of bunt balls harvested. Harvest below 15% Bunt balls and spores that are dry […]
Sudden death syndrome (SDS) is most visible when the soybean crop enters the reproductive stages of development because most of the resources of the plant begin to shift from vegetative (leafs, stems, roots, etc) growth to producing and filling the pods. When this shift in resources occurs, the plant’s natural defense mechanisms are reduced (especially […]