Caution! Members of the sorghum family – sorghum, sudangrass, and hybrid sorghum-sudangrass – contain dhurrin, a glucoside that breaks down to release hydrocyanic acid, also known as prussic acid (hydrogen cyanide, HCN). A sudden disruption of growth such as frost, drought or cutting, causes prussic acid to be released inside the plant at a more […]
Ontario winter canola yields were very strong in 2020 giving us a good look at the incredible yield potential of the crop. Many producers reported yields over 3700 lb/ac and some watched their yield monitors jump over the 5000 lb/ac mark. The mild winter was likely a big part of that success, but Mother Nature […]
Environment Canada has issued frost advisories for most corn growing areas of the province for the nights of September 18 to 20 which are expected to be near or slightly below freezing (Figure 1). This is earlier than we typically observe first frosts, earlier than our long-term season end dates (Table 1) and much lower […]
With the first usher of cool fall weather this past week, there were frost warnings for parts of Northern Ontario. With the introduction of increasingly shorter maturity corn hybrids, there has been more corn grown in shorter season areas than what has been typical in the past, and also growers who may have recently started […]
Alfalfa frost damage can sometimes occur in the spring after growth has started, resulting in damaged growing points. Some wilting can be visible about 24 hours after frost or some yellowish or brownish discolouration 3 or 4 days later. The top of the stems will typically bend over with a “shepherd’s hook”. Damage is often minimal […]
This article was written by James Byrne and Megan Van Schaik, OMAFRA Beef Cattle Specialists, and Ben Rosser, OMAFRA Corn Specialist. In many parts of the province, 2019 proved to be a challenging year to get crops in the ground in a timely fashion. The impacts of spring conditions are still felt as we approach […]
Late planting dates, low Crop Heat Unit (CHU) accumulations, and early frost may result in situations where corn is killed by frost before it reaches the normal stage of maturity and moisture for silage. Some fields planted for grain may not mature adequately for optimum yield, moisture and quality. Farmers may be looking at salvaging […]
Over-night temperatures on May 22 to 23 dipped to -2 to -3 oC in many parts of Ontario. Cereal crops are hardy to light frosts. Leaf tissue on plants that have not hardened off will withstand temperatures of -4 oC or lower before the cells will freeze and damage occurs, making late spring frosts of […]
Various areas in the province received frost in September and there continues to be concern the impact subsequent frost will have on the soybean crop. The extent of injury will depend on the stage of development as well as the length of exposure to frost. MECHANISM Low temperatures injure plants primarily by inducing ice formation […]
With three consecutive days of morning frost in many parts of the province, the two most common questions are 1) Will the corn be alright? and 2) When can I start to apply herbicides? Question 1 is answered nicely by Greg Stewart in this story (the abbreviated version is that things will be fine but if […]
I took the above video in 2010 when a lot of corn was planted in mid April and had emerged nicely only to be hit with a frost in May. Although the injury looked bad at the time, because the growing point was below the ground the crop made a complete recovery and 2010 saw […]
There is a significant increase in acres of new forage seedings. Many forage seedings are already in the ground. Ensure good seed-to-soil contact by preparing a firm seedbed. Forage inventories are exceptionally low for this time of year, with record high hay prices being reported. Frost Damaged Alfalfa: A considerable amount of alfalfa was damaged […]
There was an early break in alfalfa dormancy in early- to mid-March. In some areas, significant alfalfa growth (up to 6 – 8 inches or more) was frost damaged when colder temperatures returned on March 30th (-7°C or colder). Damage was most severe in south-western Ontario, on good healthy stands with early, aggressive growth. Ironically, […]
Canola seedlings can with stand a considerable frost (-5 to -8 0 C) if plants have become acclimatized following a few days of cold temperatures. However, canola seedlings growing under warm conditions will be tender, and can be killed by even a f few degrees frost. Ice crystals will form on the leaf surface before […]