![]() On dry, low elevation rangelands of the U.S. Larvae feed above ground at night and usually hide in soil during daylight, but will also feed on cloudy days. Co-operators include producers, Regional Crops Specialists, researchers and industry agronomistsįor information on bertha armyworm and economic thresholds refer to the our Bertha Armyworm webpage.These native North American larvae consume emerging small grains, alfalfa, and canola in the southern Great Plains and southern Canada. Each trap contains an artificial pheromone that mimics the natural bertha armyworm female attractant. The Ministry of Agriculture monitors for insects through a network of co-operators across Saskatchewan that provide numbers of adult bertha armyworm moths captured in pheromone-baited traps. 1,200 to 1,500 = high risk monitor fields more frequently.900 to 1,200 = moderate risk check for larvae and evidence of damage.300 to 900 = uncertain, most variability for this level periodic monitoring of fields to verify actual numbers of larvae (especially bolting fields) is required.0 to 300 = low risk control measures unlikely in most cases.General recommendations for observed moth numbers (from pheromone traps): Plants in full flower had the highest number of eggs compared to the pre-flower and podding stages. In some cultivars, the number of eggs was high but larval damage was limited. Research has noted that Bertha armyworm egg-laying varied substantially among different species of Brassica plants. When scouting for eggs, there can be differences between canola cultivars. Adult emergence precedes egg laying so can be considered a warning that the destructive larval stage will be present shortly. Moths start to emerge in some areas mid-June with peak emergence about mid-July. Keep in mind that there have been situations where high populations of moths in traps have not corresponded to high numbers in adjacent fields.Įmergence of bertha armyworm moths is highly dependent on temperature. Individual field monitoring will be important in the coming weeks in order to determine if control measures will be necessary. The map is intended to display risk on a regional basis. However, other crops, including flax, can be impacted. Generally, cruciferous crops such as canola and mustard are at risk from bertha armyworm. The map is updated weekly until early August. The map displays the cumulative male moth counts reported from traps at more than 200 locations in Saskatchewan. ![]() The risk map will provide important information if higher risk areas are identified. This recent increase doesn’t necessarily mean that populations are going to outbreak, but we will continue to monitor. We anticipate eventual increases consistent with the historical bertha armyworm cycle. The last year with significant infestations was 2013. Regional bertha armyworm outbreaks tend to last for two to three years, with eight to ten years between. Numbers in trap catches continued to decrease from 2019 to 2021 but increased modestly from 2021 to 2022. In-crop monitoring for larvae should begin about two weeks after peak emergence. We will update the map regularly over the next weeks. With the cool conditions in many parts of the province this spring, development was likely delayed somewhat. Ongoing counts of Bertha armyworm indicate increasing cumulative catches in many areas. If you have any questions about Google™ Translate, please visit: Google™ Translate FAQs. Government of Saskatchewan is not responsible for any damage or issues that may possibly result from using translated website content. Some files or items cannot be translated, including graphs, photos and other file formats such as portable document formats (PDFs).Īny person or entities that rely on information obtained from the system does so at his or her own risk. The Government of Saskatchewan does not warrant the accuracy, reliability or timeliness of any information translated by this system. The translation should not be considered exact, and may include incorrect or offensive language. Software-based translations do not approach the fluency of a native speaker or possess the skill of a professional translator. Translations are made available to increase access to Government of Saskatchewan content for populations whose first language is not English. Google™ Translate is a free online language translation service that can translate text and web pages into different languages. Where an official translation is not available, Google™ Translate can be used. The home page for French-language content on this site can be found at: These translations are identified by a yellow box in the right or left rail that resembles the link below. A number of pages on the Government of Saskatchewan's website have been professionally translated in French.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |