July 30, 2014
Thresholds are 100-150 larvae per square metre in immature to flowering plants and 200-300 larvae per square metre (20-30 per square foot) in plants with flowers and pods. While these nominal thresholds are based on dense stands of 150-200 plants per square metre, plant population is not a major factor. Fewer plants will have more branching and more pods, so…
July 31, 2013
Diamondback moth larvae are showing up in canola fields. The most accurate method to estimate diamondback moth population density is to count larvae in several locations throughout the field, and determine the average population per unit area…
July 4, 2013
The most accurate method to estimate diamondback moth population density in canola is to count larvae in several locations throughout the field, and determine the average population per unit area…
May 23, 2013
South winds from Texas and California/Mexico have reached the Prairies, as the maps show. Winds from the south central U.S. bring aster leafhoppers (which carries aster yellows phytoplasma) and the California winds can bring diamondback moths…
July 25, 2012
Some fields may have a variety of green worms feeding, including bertha armyworm, diamondback moth larvae, imported cabbageworm and alfalfa looper. Here's how to tell them apart…
June 13, 2012
Before spraying for diamondback moth larvae, make sure that: 1. Large areas within the field have reached the nominal threshold of 25% or more of the leaf area lost. 2. Diamondback larvae are still present. 3. They are actively feeding. (Many diamondback moth larvae may have started to cocoon (pupate) and are no longer a threat.) 4. Newest leaves are…
June 8, 2012
Add diamondback moth larvae to your early season scouting list. Growers cannot expect insecticide seed treatment to protect canola from diamondback moth larvae, so spraying may be necessary in some fields or parts of fields. Before spraying, make sure that: 1. Large areas within the field have reached the nominal threshold of 25% or more of the leaf area lost…
May 9, 2012
If flea beetles are already out and on volunteers given the conditions we’ve had, as soon as it gets warm, they will be feeding more aggressively…
April 25, 2012
Striped flea beetles seem to be more common each year, especially in the northern canola growing regions. Research suggests that a population of striped flea beetles may do more feeding on seed-treated canola prior to control than a similar population of the crucifer type, so look closely when scouting…
Return to Canola Council Home