Insects

cabbage seedpod weevil Barkley

Cabbage seedpod weevil review

Cabbage seedpod weevil continues to expand across the Prairies, contributing to yield losses of 5 to 30%. Insecticidal control remains the main management strategy despite decades of research into alternative biological and cultural methods of control. The cabbage seedpod weevil, Ceutorhynchus obstrictus (Marsham) (Coleoptera: Curculionidae), is native…

L keltoni flixweed DJohnson

Revising Lygus bug economic injury levels

The overall Economic Injury Level was found to be around 9 to 23 Lygus bugs per 10 sweeps using $15.47/bu ($682/tonne) canola prices. However, insecticide trials on farmers’ commercial fields found that yield was protected from Lygus feeding with a foliar insecticide application at the…

Female Inostemma walkeri

Wheat Midge Parasitism in the Peace River Region of Alberta

Wheat midge parasitism was found to be as high as 71% in the Peace River region of Alberta.  Parasitism was primarily by Macroglenes penetrans, the main parasitic wasp species that attacks wheat midge on the Canadian Prairies.  A parasitic wasp species, Inostemma walkeri, was newly…

pea aphid

Economic threshold for pea aphid in lentil

A new economic threshold of 36 ± 7 aphids (29 to 43 aphids) per 180 degree sweep was calculated for Saskatchewan lentil, and provides 7 days lead time to arrange insecticidal application. The economic injury level was calculated at 78 ± 14 aphids (64 to…

male sawfly (Goulet, H.)

Triticale variety and seeding rate affect wheat stem sawfly survival and parasitism

AC Ultima formed relatively solid stems at lower internodes compared to Pronghorn, although this did not reduce stem cutting by wheat stem sawfly.  Higher seeding rates of both cultivars resulted in lower wheat stem sawfly damage and higher amounts of sawfly parasitism. Little research has…

diamondback moth eggs

Bertha armyworms feed more on canola plants with diamondback moth eggs

Bertha armyworm larvae caused over twice as much feeding damage on plants with diamondback moth eggs than plants without. However, bertha armyworm egg laying was not affected when canola plants had diamondback moth eggs. Diamondback moth adults migrate to the Prairies on winds from the…

Alfalfa weevil larvae

Alfalfa weevil and its parasitoids

The alfalfa weevil increased from a minor pest in 2001 to be the principal insect pest of alfalfa in 2014. Its biological control agent Bathyplectes curculionis, a parasitoid wasp, now also occurs in most areas where alfalfa weevil is found on the Canadian Prairies. The…

Delia root maggot

Root maggot impacts on canola were minor

Research showed no reduction of seed yield for Brassica napus canola at any infestation level of flies or eggs. Root maggots may be more of a perceived than real threat to Prairie canola producers. Recent wet field seasons across much of the Prairie provinces have…

wireworms

Broflanilide insecticide controls wireworms

Broflanilide provided consistent protection against wireworm damage in wheat, and also reduced neonate and resident wireworm populations at levels similar to the deregistered lindane but at a far lower dosage per acre. Wireworm has remerged as an insect pest in cereals, corn, potato, and vegetables…

sticky card

Tips for a more integrated approach to flea beetle control

This study validated the nominal economic threshold of 25 per cent defoliation. It also determined significant associations between landscape structure and flea beetle abundance, weather and flea beetle abundance, and plant density and flea beetle damage. As well, two flea beetle predators were confirmed. Flea…

Canola flower midge

Research continues into possible economic significance of new Canola Flower Midge

A new species of gall midge, Contarinia brassicola Sinclair (canola flower midge), was identified on the Canadian Prairies in 2017. To date, economic injury to canola has been low, and research has found early seeded canola had higher feeding damage, but still produced optimum yield….

wheat stem sawfly and Bracon cephi

Reduce wheat stem sawfly impact with lower seeding rate in solid-stemmed wheat

Seed solid-stemmed CWRS and CNHR wheat varieties at 30 to 35 seeds per square foot to maximize stem solidness and reduce the impact of wheat stem sawfly. For hollow-stemmed CWRS varieties and durum wheat, seed at 40 to 45 seeds per square foot. Growing solid-stemmed…

Cabbage seedpod weevil flower

Impact of cabbage seedpod weevil control on Lygus bug

Research in southern Alberta found that canola fields seeded in April were the most susceptible to cabbage seedpod weevil. A new action threshold of 25 to 40 cabbage seedpod weevils per 10 sweeps at early flowering stage was developed. When cabbage seedpod weevil populations were…

lygus bug on faba bean pod copy

Faba bean seed damage by lygus bug and chocolate spot

Lygus bug and chocolate spot disease can damage faba bean seed. Research found both organisms are widespread in central and southern Alberta. Seed damage occurs independently of each other, and is primarily caused by lygus bug. Seed damage caused by lygus bug (Lygus spp.) or…

wheat stem sawfly larvae

Wheat stem sawfly control in durum wheat

Seed at least 40 seeds per square foot (400 seeds per metre square) for optimum yield and wheat stem sawfly management when growing solid- or hollow-stemmed durum wheat varieties. The foundation for reducing yield loss from wheat stem sawfly (Cephus cinctus) in wheat varieties is…

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