Experiments were set up in mid-August of 2020 (targeting the 3rd NOW generation) and late April of 2021 (targeting the 1st NOW generation). Two rows of a pollinizer variety (in 2020) or three rows of Nonpareil variety (in 2021) were selected in the orchard, and one strand of each treatment (Table 1) was hung in a total of 15 to 20 trees. The strands were thoroughly dipped in two quarts (1.89 L) of the prepared insecticide solutions for 10 seconds, allowed to air dry for about 30 minutes, and deployed to the selected trees in an almond orchard (Photo 1B). All insecticide concentrations were prepared in water using the 100-gallon per acre rate. 15 to 20 mummy strands (20 replicates in 2020 15 replicates in 2021) were used for each of the 11 insecticides and a water-treated control (Table 1). The insecticide study was conducted using mummy nut strands that consisted of 20 mummy nuts glued to a strand cut from window screen material (Photo 1A). Almond mummy nut strands have been used to evaluate insecticide performance in several other NOW studies. We used mummy strands to compare insecticide efficacy as conducting large field trials is not always feasible, especially when several treatments with multiple replications are needed. As insecticide is a part of the NOW IPM strategy, in the 2020/2021 seasons, we evaluated the efficacies of multiple insecticides against NOW using the previous season nut (i.e., mummy nut) strands as substrate. All of these methods are commonly used IPM practices and should be combined to achieve the best results. The current NOW integrated pest management (IPM) practices include: (1) winter sanitation to remove and destroy ‘mummy nuts’ before mid-March, (2) mating disruption product application at the beginning of the season to gradually reduce the NOW population, (3) timely harvest to minimize late-season infestations, and (4) one to two insecticide spray applications during hullsplit. Navel orangeworm (NOW) is one of the important pests that draws nut crop grower’s attention throughout the season.Īlthough the economic damage may not be significant every year, the unpredictability associated with this pest makes it difficult for growers and PCAs to relax some of their pest management practices. If there is an average of 3 adults and/or nymphs per sweep on 3-inch seed alfalfa or more than 5 adults and/or nymphs per sweep on seed alfalfa over 3 inches tall, a treatment may be advisable.Jhalendra Rijal, UCCE Area IPM Advisor, Stanislaus County Sudan Gyawaly, UCCE Associate Research Specialist, Stanislaus County University of California Cooperative Extension, Stanislaus County, Modesto, CA Navel Orangeworm Integrated Pest Management Fall seedings especially need protection from larval defoliation and possibly plant death.ĭepending on the value of the crop, defoliation levels as low as 10-15% may be economically justified.Īlfalfa grown for seed may need protection. Do NOT feed infested hay, even if treated, to horses.Ĭaterpillars: (alfalfa caterpllar, armyworms, cutworms, green cloverworm loopers, and webworms)ĭepending on the value of the crop, defoliation levels as low as 10-15% may be economic. Controls should be applied well before harvest, and hay conditioners should not be used. Livestock ingesting hay infested with dead blister beetles may become sick or die. Refer to Table 1 for management guidelines.Ģ) less than 10% of the aphids are parasitizedĤ) the average stem length is less than 14 inches.Ģ) less than 10% of teh aphids are parasitized, Read and follow ALL label rate, application, and use directions This publication is intended to aid pest managers in treating pest infestations in alfalfa during the growing. Field Crops ALFALFA INSECT CONTROL RECOMMENDATIONSĬhristian H.
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