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2022 Midwest Vegetable Guide

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Sweet Corn – Weeds 279 season at plant application. Do not use 10DF, 10WP, or 10WSB formulations; they are not labeled for sweet corn. Allow 7 days between applications. REI: 12-hour. PHI: 30- day. IRAC 03A. RUP. Capture LFR (1.5) (bifenthrin) | 0.2-0.78 fl. oz. per 1,000 linear bed ft. of row. Apply at planting in furrow or a T-band. See label. REI: 12-hour. IRAC 03A. RUP. Counter 20G (terbufos) | 4.5-6.0 oz. per 1,000 linear ft. or row. Available as Lock 'N Load, SmartBox, and SmartCartridge. Do not exceed 1 application per acre per crop. REI: 48-hour. IRAC 01B. RUP. Force CS (2.1SC) (tefluthrin) | 0.46-0.57 fl. oz. per 1,000 linear ft. of row. Apply Force Evo (2.1CS) at 0.46-0.57 fl. oz. per 1,000 linear ft. of row. Apply Force 6.5G at 1.8-2.3 oz. per 1,000 linear ft. of row. Apply Force 3G at 4-5 oz. per 1,000 liner ft. of row. Apply Force 10G at 1.25-1.5 oz. per 1,000 linear ft. or row. Apply at planting. Do not exceed 1 application per crop. REI: 48-hour. IRAC 03A. RUP. Mocap 15G (ethoprop) | 8 oz. per 1,000 linear ft. of row. Apply in band over closed seed furrow and incorporate with tines or drag chains. Do not place in the furrow or in direct contact with the seed. Do not exceed 1 application per crop per year. REI: 48-hour. IRAC 01B. RUP. Seed treatments for insects (thiamethoxam, spinosad, abamectin) | Plant seed that has been treated with an insecticide prior to planting. Although most sweet corn seed has been treat with fungicide, it is seldom treated with an insecticide to prevent seed and seedling damage. Use diazinon, Cruiser, or Poncho. Follow label directions. IRAC 04A, IRAC 05, IRAC 06. Thimet 20G (phorate) | 4.5-6 oz. per 1,000 linear ft. of row. Place in a 7-inch band over the row behind the planter shoe and in front of or behind the press wheel and lightly incorporate. REI: 48-hour. IRAC 01B. RUP. Sweet Corn – Weeds Reviewed by Stephen Meyers, Ben Phillips – Sept 2021 Recommended Controls All Weeds Weed control methods in sweet corn vary by production system and variety. For sweet corn that is no-till, direct-seeded into a killed crop (such as after a rye cover crop, or wheat) growers often use a burndown herbicide with a preemergence herbicide. For sweet corn direct-seeded into tilled soil, growers often combine one or more preemergence herbicides at planting with one or more cultivations. Sometimes, growers also apply a preemergence herbicide after the last cultivation to improve control of late-emerging weeds. Small, emerged weeds in both systems can be controlled with selective postemergence herbicides and/or shielded applications of nonselective herbicides. For early sweet corn direct-seeded under vented plastic row cover, some herbicides are applied before laying the plastic to prevent germinating weeds along with the early corn. But, without good incorporation or irrigation for activation these rows will usually need extensive clean up after the row-cover comes off. There are sweet corn varieties that are tolerant of glyphosate (RoundUp-Ready), glufosinate (Liberty-Link), or sethoxydim (Poast-Protected) applications over-the-top of the crop. Confirm the herbicide tolerance traits of your sweet corn before making an over-the-top herbicide application. For specific weeds controlled by each herbicide, check the Relative Effectiveness of Herbicides for Vegetable Crops table. Rates provided in the recommendations below are given for overall coverage. For a banded treatment, reduce amounts according to the portion of acre treated. Non-Pesticide A stale seedbed can be prepared prior to transplanting with flame weeding or very shallow cultivation to control emerged weeds, instead of herbicides. Later plantings of sweet corn lend themselves to this stale seedbed practice because they are often planted after common weeds have emerged in tilled soil. Uniform and close plant spacing in the row promotes rapid canopy cover, and fresh market growers can keep larger between-row spacing clean with between-row cultivation tools for hand-pickers or mechanical harvesters. Rolling cultivators on wide tool-bars offer effective, high-speed between-row cultivation. Pesticide 2,4-D amine products (2,4-D) POST | 4L amine formulations at 0.5-1.5 pts. per acre. Use lower rates on annual weeds and higher rates on perennial weeds in the bud stage. Use drop nozzles if corn is more than 8 inches tall. Do not apply to open whorls or from 2 week before tasseling through harvest. Avoid drift onto other vegetable crops. Can cause severe injury to some varieties. REI: 48-hour. PHI: 45- day. HRAC 04. Midwest Veg Guide 2022

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