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Sweet Corn, Bean and Pea Edition
Sweet Corn Herbicide Label Expansion Sweet Corn Herbicide Label Expansion The Callisto label has been expanded to include post-emergence use on sweet corn. Callisto provides control of annual broadleaf weeds including eastern black nightshade, redroot pigweed, velvetleaf and common ragweed (suppression only). Callisto will control triazine and group two resistant biotypes. Apply Callisto 480SC to 3-6 leaf stage sweet corn at a rate of 210 mL/ha (87 mL/ac). Make only one application per year. Do not harvest sweet corn within 50 days of treatment. Sweet corn varieties often vary in their tolerance to post emergence herbicides. Always consult with the seed supplier or conduct a field test on a small area of the crop prior to full-scale usage. Do NOT apply on Delmonte 2038 as unacceptable crop injury will occur. Herbicides: it is never too early to start planning for next year While herbicides like Callisto provide sweet corn growers with a good option for broadleaf control in sweet corn, they may limit next year’s rotation options. Crops like broccoli, carrots, cucurbits and onions may not be grown for at least two years following a Callisto application. Primextra II Magnum, another common sweet corn herbicide also has rotational restrictions due to the atrazine content. Always read the full label before applying any pest control product. We are hearing isolated reports of both armyworm and cutworm activity. The threshold for both of these pests is 10% feeding injury. With both of these insects, if the larvae have reached approximately 1.5” in length, they are ready to stop feeding and pupate. Control may not be necessary on these mature larvae. Black light trap counts in Harrow, European Corn Borer - Accumulated Growing Degree Days Bivoltine European Corn Borer adults emerge from the overwintering pupae at 150 GGD. Peak moth flights for the first generation occur at 300-350 GDD. In the univoltine areas the first moths usually emerge at 300 GDD. Low numbers of corn borer moths have been caught in black light traps in the
Mike Cowbrough, Weed Management Program Lead – Field Crops Helmut Spieser, Agricultural Engineer Kristen Callow, Weed Management Program Lead – Horticulture Crops Herbicide residues in the tank can cause devastating yield losses Even if the sprayer has been "rinsed out" with water the addition of surfactants or liquid fertilizers (eg. AGRAL 90, 28% UAN) to the next tank load may cause inadvertent loosening of previous residues. If possible use a dedicated sprayer for herbicides. In strawberries for example, if you apply Poast Ultra + Merge or Venture L herbicide within two weeks of Sinbar application, the surfactants in the grass herbicides can increase uptake of Sinbar, causing noticeable phyto-toxicity and potential yield loss. Here are some pointers, along with information specified on the product labels that should be used to minimize the risk of contamination. General tank clean out steps:
General Precautions:
Choose the right cleaner:Each herbicide should have a recommended cleaning agent listed on the product label. The following table summarizes herbicide-specific cleaning agents found after several hours of combing through product labels. This is by no means a comprehensive list and therefore the pesticide label should always be consulted. What if the label doesn't specify a cleaning agent or a cleanout procedure?Some product labels simply do not state a cleanout procedure. In that case, the 7 step cleanout procedure above along with one of the three "cleaning solutions" listed would be acceptable. For "group II" products like Pursuit, the preferred cleaning agent is household ammonia, according to the manufacturer. Cleaning Solutions
Warning: Do not mix ammonia with chlorine bleach. This can produce toxic chlorine gas. Table 1. Recommended tank-cleaning agent for several herbicides used in Ontario.
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