Home / Canola Watch / Insects / Page 31
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Leafhopper populations are building, which could increase the risk for aster yellows. Even so, there is not really a good case for spraying for leafhoppers in canola. Why not?…
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Cutworms are spotty but keep scouting. Flea beetles may need to be controlled past the 4-leaf stage in some extreme cases this year. Cabbage seedpod weevil numbers are building but only spray after first flower and only if sweep net results show them at thresholds. Hold off on early grasshopper control…
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Bees are good for canola. Canola is good for bees. Canola flowers provide an important source of nectar for honey producers in Western Canada: 80% of the honey produced in Canada comes from canola flowers. Honey bees and other pollinators can also increase canola yields. Although napus canola is self-pollinating, studies show that the extra level of pollination that bees…
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Aster leafhopper numbers are quite low so far this year, down considerably from 2012. Aster leafhoppers carry aster yellows phytoplasma, so without leafhoppers to transfer the disease, there is no infection. Based on what we know at this stage, there is no evidence of a significant aster yellows risk for 2013…
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Flea beetle spraying picked up again this week, as more canola fields reached thresholds. Don’t give up on flea beetle scouting just yet. Click here for more on the flea beetle spray decision. Cutworm feeding has been detected in some fields, but spraying is still minimal at this time. Digging will be required to distinguish whether cutworms or wireworms are…
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When spraying for weeds it may be economical to add an insecticide or fungicide to the tank mix to hit any insects or disease (blackleg) that may be present at the same time. However, consider these four issues before proceeding: 1. Is the tank mix supported by the product manufacturers? (See the next article for more on this.) 2. Be…
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Growers must take extra precaution with any tank mix that is not identified and approved on the product label. The risks with off-label tank mixes include but are not limited to: —Damage to the crop —Antagonism or other reduction in control of one or more of the labelled pests —Residues in excess of the limits of those set for the…
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Cutworm activity has been light so far this year, with a few fields sprayed across the Prairies. We do expect to hear of more cases as crops start to emerge and feeding patches start to show up. Keep an eye out as many cutworm species will feed on canola, and each has its own cycle — as the table shows…
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A few flea beetles do not warrant an insecticide application. Follow these guidelines when making a flea beetle spray decision:…