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According to Jon Turmel, State Entomologist with the Vermont Agency of Agriculture, Food and Markets, the following products available and labeled include the following crops:
- carbaryl (Sevin), lambda-cyhalothrin (Warrior) or permethrin (Ambush, Pounce) - Pyrethrins (Pyronyl Crop Spray)
- carbaryl (Sevin) or lambda-cyhalothrin (Warrior) - Pyrethrins (Pyronyl Crop Spray)
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Agrisolutions Malathion ULV [Agriliance LLC]
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67760-34-1381
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Fyfanon ULV [Cheminova Inc]
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67760-34
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AllPro Carbaryl 4L Flowable [Value Garden Supply LLC]
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45735-25-769
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Malathion 57 EC [Loveland Products Inc]
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34704-108
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Mustang Insecticide [FMC Corp Agricultural Products Group]
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279-3126
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Mustang Max Insecticide [FMC Corp Agricultural Products Group]
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279-3249
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Tombstone Helios Insecticide [Loveland Products Inc]
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34704-978
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Tombstone Insecticide [Loveland Products Inc]
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34704-912
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Respect Insecticide [BASF Corporation]
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279-3249-7969
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It is best to spray late in the day since larvae are active at night. Be sure to read the label for proper rates and harvest/grazing restrictions. When applying pesticides, be extremely diligent in keeping with the minimum harvest intervals for any chemicals applied. Make sure to keep both people and animals out of the sprayed fields for at least a week or longer as directed.
According to Cornell recommendations, an insecticide should only be applied to corn in the whorl stage if most plants are showing damage and about three larvae per plant are found. Penn State recommendations are to treat only when 25% of plants are damaged or killed. Larvae size is also important. If armyworms are less than 3/4 inch in length they still have another week or so to feed. If larvae are mostly 1 1/2 inches in length, then they are nearly done feeding and very little additional leaf injury will occur so the field should not be sprayed; it is too late for the insecticide to be of any economic benefit.
A border 20 to 40 feet wide treated with insecticide will prevent armyworms from invading from an adjacent field. Again, if a large majority of the larvae are longer than 1 1/2 inch in length, they are nearly done feeding and will soon pupate, so there would be little benefit to spraying.
There is little to no information on threshold levels for grass hay fields. Based on small grain recommendations, I suggest using 4 to 5 larvae (less than 3/4 inch in length) per square foot. Be sure to check under debris as well as on the plants for larvae. If the field is cut as a control strategy, be sure to continue monitoring surrounding fields and regrowth. If there are nearby corn or small grain fields, it may be prudent to spray a 20 to 40 foot border to kill invading larvae.
Armyworm will only start eating alfalfa when all other resources are consumed. In a mixed stand, the grasses will be preferentially eaten.
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