While temperature is an important factor, high humidity increases absorption of many herbicides compared to low humidity levels. Coarse droplets reduce drift, lowering drift potential.As crops and weeds enter rapid growth stages, unfavorable weather conditions can make timely herbicide applications challenging.To limit yield loss from weed competition, target postemergence herbicide applications before corn and soybean reach the four-leaf and V4 growth stages, respectively. Switching to another chemistry, such as a sulfonylurea herbicide, may be a safer option especially at reduced label rates.
If it is too hot or cold, the herbicide will not be effective. Extreme heat or cold. Spray droplets aren’t dispersed, but stay in a concentrated mass that can move off-target with any subtle airflow.Avoid spray drift. They do, however:The Minnesota Department of Agriculture receives approximately 150 pesticide-related complaints per year. If the temperature is over 90°F and weed size allows, consider postponing PPO-inhibiting applications to reduce the risk of crop injury. However, when growers rush to complete weed control operations under very windy conditions, herbicide drift and injury to non-target crops can be anticipated. Crops are currently battling with summer annuals like What Can You Learn at Harvest? Give Woody Plants the Brush Off with Stump StopTips for Replanting After Spraying a HerbicideNo matter the size of your operation, effective “We recommend spraying crops, pasture or turf when wind speeds are slower than 7 mph,” says Mike Massey, president of Ragan & Massey. However, there is often confusion regarding the language on labels about this issue. Others may only have a broad, short statement without details requiring that the applicator prevent drift or not spray “when conditions may result in drift.”Requirements can include, but aren’t limited to:Boom height depends on nozzle angle and spacing. Tall fescue is naturally more sensitive than bermudagrass to sulfentrazone and rates must be reduced to account for lower tolerance levels. POST herbicide activity could be influenced by the alteration in leaf architecture exhibited by plants during hot and dry conditions. This product shows 2,4-D as only active ingredient, and has general warning about applying when over 90 degrees. The distribution, sale and use of an unregistered pesticide is a violation of federal and/or state law and is strictly prohibited. This combo is good for a strong knockdown on clover, spurge, and crabgrass. Uninhibited growth of warm-season grasses at higher temperatures may be attributed to better tolerance to herbicide applications in summer relative to cool-season grasses. For example, 110-degree nozzles at 20-inch spacing should be 15 to 18 inches above the target to produce a uniform application rate across the length of the boom. While there’s no state law dictating restrictions at specific wind speeds, pesticide users must follow all product label directions and precautions, which may list specific wind speed restrictions.Applying pesticides during a temperature inversion – which does occur in Minnesota – can cause damaging, long-distance drift. If your area often receives a great deal of rain, there are certain weed killers which are rain fast in 2 to 4 hours of spraying. See How Ag Chemical Price Transparency Empowers This Mississippi FarmerProudly Farmers First®: Farmers Business Network® Membership Is Now FreeNot all PPO-inhibiting herbicides cause the same amount of crop response, so if crop response is a concern, consider adding a surfactant like Methylated Seed Oil (MSO) and/or Crop Oil Concentrate (COC) to your tank-mix when spraying in warm weather. Some labels require a 30-foot downwind buffer in the direction the wind is blowing. Copyright © 2014-2020 Farmer's Business Network, Inc. All rights reserved. (2015).
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