Cabbage seedpod weevil may cause appreciable yield loss to a canola and different brassica crops, comparable to mustard. As adults, the pest is three to 4 millimetres in size, is ash-grey in color, and has a outstanding curved snout, just like different weevils.
Meghan Vankosky, subject crop entomologist at Agriculture and Agri-Meals Canada Saskatoon, joins Kara Oosterhuis for this Canola Faculty episode to speak scouting for cabbage seedpod weevils, the harm they will do, and when to take motion.
“The best way to look for cabbage seedpod weevil is actually to sweep for them,” says Vankosky. “You’re going to find them in the upper canopy of the plant, because at this time of year as the flowers are starting and the buds are coming out, the weevils are going to be laying eggs into the flowers and into the pods.”
Sweep on the stage of foliage and flowers, when crops are on the 10 to twenty per cent flowering vary, then examine the web to see what number of cabbage seedpod weevil there are. The pest might be extra lively when the temperature will get into the 15 to twenty levels C vary, and scouting into the afternoon can be a good suggestion, says Vankosky. Adults emerge because the crop is beginning to bolt, and because it’s beginning to flower, then a bit later will lay eggs.
“Adults will feed on the foliage, so you’ll find maybe some chewing damage on the leaves lower down in the canopy,” says Vankosky. “But, the real damage to yield comes from the larvae — they’re actually going to feed inside the pods.”
Larvae will feed on creating seeds contained in the pod, then will chew a gap by the pod to exit, which might weaken the pod, leading to shatter at harvest, and much more yield loss. (Story continues beneath video)
Vankosky says the edge is three to 4 weevils per sweep, however to take 10 sweeps in no less than 4 to 5 areas. If there are greater than three to 4 weevils per sweep, think about taking motion.
As of but, there aren’t any direct parasitoids or useful bugs go after cabbage seedpod weevil, however Vankosky says that it’s nonetheless essential to guard the beneficials on the market, as a result of they could possibly be consuming different pest bugs.