Home / Canola Watch / Flea beetle / Page 5
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While only a small percentage of canola fields tend to require flea beetle management in addition to seed treatment, all fields should be monitored to assess the potential threat. Begin monitoring right after emergence and through until at least the four-leaf stage. Seed treatment can be effective through most of this period, but slow starting or slow growing crops under…
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Canola fields at greatest risk from flea beetles — therefore fields most likely to need a spray — tend to be those seeded early and that went through a long stretch of slow growth…
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Here is how to make the flea beetle spray decision…
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Flea beetles are feeding on volunteer and early-seeded canola but their presence does not mean they need to be sprayed…
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Warm weather has meant an earlier emergence of overwintering adult flea beetles. Given that flea beetles will be active when canola emerges, growers will want to pay attention in the few weeks after emergence to see how seed treatment protection holds up and whether additional sprays are warranted…
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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…
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Flea beetles remain the single biggest insect threat this week, although pressure seems to be waning. Cutworm losses have been reported in a few fields across the Prairies, but damage is usually patchy within a field and nearby fields might not have any losses. The key with all insects is to scout and count and adhere to economic thresholds for…
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Under hot conditions the metabolism of (some) target insects is significantly faster. Control of the pest is more complete when the metabolism of the pest is slower which is generally associated with cooler or moderate temperatures. It is also known that control of some insect species with pyrethroid insecticides decreases as temperature rises. Some pests are also more available in…
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