Albertas government site has info on where to buy them.
(See the videos below.).
Sweep net results can be highly variable throughout a field.The standard sweep net has a 35 long handle and 15 (38 cm) diameter net.Flying insects can pop out of the net quickly, making it harder to do an accurate count.Cspw as they first move into a field can accumulate in high numbers along field margins, so make note of this if it occurs as this edge effect will not accurately predict the insects numbers across the whole field over time.Here xcel rebate furnace are three videos that can help with scouting and sweep-netting tips for cabbage seedpod weevil and lygus.Extension entomologists recommend a minimum of 5 sampling sites, in a W or X pattern throughout the field, with 10 sweeps at each site.Large Ziploc bags, especially the breathable ones, are a handy companion for the sweep net.Lygus bug and cabbage seedpod weevil economic thresholds are based on sweep net counts, and proper counts depend on using the standard sweep net and technique.
Lygus can show up in all areas of the Prairies, but even if you dont typically have lygus or cabbage seedpod weevil, a sweep net can be useful to identify the presence of beneficial insects, of diamondback moth larvae and other insect pests.Carefully dump all contents into a Ziploc bag, then count insects through the perforated bag.Jesse Krause, a doctoral student at the University of California, Davis, uses a technique called sweep netting to scoop up the arthropods that hang out on the vegetation.You may want to scout two days in a row, unless average numbers are well above threshold.New analysis of cabbage seedpod weevil (cspw) sweeps indicate that two pairs of sweep locations a total of 4 sets of 10 sweeps provides around 97 accuracy as compared to much larger sample sizes.