Home / Canola Watch / Insects / Page 29
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Many canola fields are within 5 to 10 days of swathing, which limits the choices for insecticides — based on pre-harvest intervals. Here are the pre-harvest intervals for insecticides registered for insect control in canola. Try the interactive PHI tool at www.spraytoswath.ca…
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Again this year, canola crops with blanks or missing pods on the main stem are being found. Typically, a missing pod can result from any stress on the plant because stress inhibits proper fertilization of the flowers. It is important however, to accurately determine the cause of the stress in order to take steps to reduce its impact on future…
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Bertha armyworm spraying has been reported in a few fields. Scout lower in the canopy this week, looking for larvae feeding on lower leaves. Scouting now will give you a couple weeks’ planning time before leaf drop begins and berthas start moving up toward the pods — where they do their most costly damage. By holding off until bertha larvae…
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Pre-harvest interval (PHI) refers to the amount of time that must lapse (in days) after a pesticide application before the crop is cut (ie. swathed or straight cut). Failing to comply with a product’s pre-harvest interval is a contravention of the Pest Control Products Act (PCP). The PCP Act was put in place to protect human health and safety and…
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Lygus counts are very high in some locations, but get out the sweep net and scout to be sure. If canola is $12 per bushel and application costs (insecticide and application) are $12 per acre, the economic threshold for lygus bugs is 8 per 10 sweeps at the end of flowering and 11 per 10 sweeps at the pod…
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Bertha armyworm spraying has been reported in a few fields. Scout lower in the canopy this week, looking for feeding on lower leaves. Spotting them down low will give you……
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Some canola fields are exhibiting missing or stunted pods at the top or middle of stems. Pods in some fields have been described as green on the ends and translucent in the middle. The most likely cause is environmental. The few days above 30°C in early July would certainly cause flower abortion, and the hormone response to a couple days…
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Diamondback moth larvae are showing up in canola fields. The most accurate method to estimate diamondback moth population density is to count larvae in several locations throughout the field, and determine the average population per unit area…
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3. Record what you find. With detailed records, including insects found in each field, insect numbers, what they’re feeding on, time of day, temperature and weather conditions, you know which fields to scout more frequently, and you have comparison points for other fields and other years. 2. Follow thresholds. Every major insect of pest of canola has an economic control…