The later the mowing, the less is the likelihood of a full recharge of carbohydrates before going into winter dormancy. However, the climatologists and meteorologists are very lockstep that this Fall will run 2 – 4 weeks behind schedule, so there should still be time for full recovery (full recharge of carbohydrates in the roots) from taking the crop now. We normally do not recommend cutting hay between the end of the first week in September and freeze down / winter dormancy (which is usually the last week of October) if the field is to be kept for hay the following year. If there is enough hay present to make a cutting worth harvesting, mow ASAP.If you are scouting in the middle of the day, you may need to look closer at the soil to see if they are present or not. Fall armyworms tend to be nocturnal, so scouting at that time will give the best perspective of the current situation. Whether there will be a problem in another year literally depends on which way the wind blows.
Fall armyworms cannot overwinter here, so the first good freeze event will destroy them.And as we cool down going into fall, the timeframe will be lengthened a few days. We had the first round in Lee and Des Moines Counties about 25 days prior to the events north of Highway 92, so the above-normal temperatures we had sped up the development a little. This cycle repeats itself about every 30 days. The Fall armyworms have a complete life cycle – egg, larva, pupa, adult (moth).Their favorite targets are rice, alfalfa, millets, forage grasses (including many cover crops), and turf. The moths of the rice strain fly in from Florida and the U.S.Their favorite targets are corn, sorghum, and cotton. The moths of the corn strain fly in from Texas and the Mexican Gulf Coast.There are two strains of fall armyworms.Here is some background that may help explain some later comments. There have been many questions regarding how to manage fall armyworms in hayfields and cover crop fields. 2021 has been an unprecedented year for fall armyworms, not just here in Iowa but other states as well.
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