Home / Canola Watch / Insects / Page 22
-
1. With phosphorus, ultimately the form you apply is less important than the amount you apply. Crop nutrition specialist Rigas Karamanos used the graph below to show the chronic under-application of P year after year…
-
CropLife Canada and the Canadian Honey Council have introduced a smartphone-based app to help facilitate communication between beekeepers, farmers, and sprayer operators…
-
Some growers are reporting high numbers of adult flea beetles. Adults emerge from pupae in late July and August and overwinter to feed on young canola seedlings the following spring. These same adults do feed now, but Julie Soroka and Larry Grenkow (Can. J. Plant Sci. 2012: 97-107) found that flea beetle feeding on canola in late-summer is rarely an…
-
When doing lygus counts, include adults and late instar nymphs. Nymphs are young lygus, and only the larger nymphs do enough damage to be included in sweep net counts. A key feature is the black dots on the back. Count nymphs with dots. Don’t count them if they’re small and don’t have the dots (like the one above)…
-
Diamondback moth larvae and grasshoppers have been reported, but so far nothing of widespread significance. The photo shows what grasshoppers can do to a canola plant, but their damage is usually isolated to small patches. Bertha armyworm adult traps are coming down with very little in the way of hotspots…
-
When it comes to maintaining Canada’s reputation as a high quality canola supplier, everyone in the canola value chain has an important role to play…
-
When spraying, stick to the pre-harvest interval unique to each product. When prepping bins, follow canola storage recommendations…
-
Lygus, grasshoppers, diamondback moth larvae and early bertha armyworms have been reported, as have thrips and swede midge damage, but generally nothing requiring significant widespread action. Individual fields or parts of fields may be at risk of economic loss, but overall it is a quiet week on the insect front…
-
Lots of insects are being reported, but agronomists and growers are generally doing a good job of assessing the economic threat and determining that most situations this week do not require a spray. Given the patchy nature of most insect patterns, all fields should be checked. If something is spotted that may be above thresholds, check a few areas of…