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Root maggots and root disease often show up together in the same field. Root maggots are white and up to 10 mm (half an inch) long — just like maggots. Maggot feeding can damage root crowns and impede water movement, causing wilting. Severe feeding can cause plant death. Severe root maggot damage can occur in fields with back to back…
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The most accurate method to estimate diamondback moth population density in canola is to count larvae in several locations throughout the field, and determine the average population per unit area…
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As canola starts to move from flowering and into pod formation, growers will often notice blanks up the raceme where pods did not form. Here are 7 possible reasons…
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Cabbage seedpod weevil numbers are high in some regions of southern Alberta and southwestern Saskatchewan. The map shows CSPW reach for 2012. Growers and agronomists are encouraged to scout canola fields, and follow these management decision-making guidelines:…
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Many canola fields have a combination of insects feeding on the crop. An “additive” effect is possible when more than one species are feeding on key yield-producing areas — flowers, buds or pods — at the same time. For example, lygus and cabbage seedpod weevil have been found in the same fields in the southern Prairies this week. Preliminary results…
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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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