Home Crop Monitoring Canola School: Aggressive lygus bugs and their enemies

Canola School: Aggressive lygus bugs and their enemies


Lygus bugs assault a number of broadleaf crops, together with alfalfa, flax, faba beans, lentils, and canola.

They’re a pest of concern which were a spotlight for Hector Carcamo, analysis scientist at Agriculture and Agri-Meals Canada, Lethbridge, Alta. He joins Kara Oosterhuis for this Canola College episode to speak about lygus bug species, the circumstances they thrive in, and what makes them tough to analysis.

“Lygus bugs are a very interesting pest, they happen to be a native species, so lygus bugs have been here before, feeding on various plants, and when we started doing agriculture, they found that some of our crops are very attractive to them,” says Carcamo.

Particularly this 12 months, with dry environmental circumstances, there have been outbreaks of the pest from coast to coast, says Carcamo.

Lygus bugs overwinter as adults in shelterbelts or subject edges. They begin flying and feeding on no matter vegetation they discover within the spring. When these vegetation are performed, lygus will transfer on to different crops.

Lygus populations appear to be extra synchronized with canola crops this 12 months, particularly because the crop is harassed attributable to scorching and dry circumstances. Canola is broken by lygus bugs round flowering, inflicting aborted flowers and pods, and even seen gaps within the flower raceme of the plant, which may be very aggressive.

Carcamo says that when considering of thresholds for lygus bugs, it’s necessary to recollect the crop stage — for instance, two to 3 lygus bugs per sweep on the finish of flowering.

“How do you know that the lygus are causing damage at the time? You can actually visually confirm that by walking through the field, and if you’re coming out with your pants full of sticky stuff, when the crop is oozing from the pods, that will be an indication that the lygus bugs are causing damage. You’re going to see that in the middle of the day, when you have a very hot day,” says Carcamo.

It is likely to be too late to do something about lygus bugs now, in the event that they’re already doing injury, however Carcamo says that lygus bugs are very unpredictable — it’s attainable that there could be massive populations subsequent 12 months, until there’s a chilly winter, or a really moist spring.

There are various pure enemies that may eat lygus bugs, together with a parasitic wasp, spiders, and even bigger lygus bugs will eat smaller ones.


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