Treat means for grasshoppers per yd 2 and percent defoliation at pre spray 7 DAT, and grain yield at Casselton, 2020.
#7 days to die tips and tricks alpha 14.7 trial
There were no significant differences among treatments for pre-spray grasshopper counts or percent defoliation, indicating that grasshoppers were evenly distributed across the trial and were at a population density great enough to threaten economic yield loss.Īt 7 Days After Treatment (DAT), the untreated checks had significantly more grasshoppers/yd2 and greater defoliation than all insecticide treatments (Table 2). All insecticide treatments had higher grain yield compared to the untreated checks, and there were no significant differences among insecticide treatments (Table 2).
Grasshopper counts averaged 4 grasshoppers/yd2 and percent defoliation averaged 14.7% across all treatments, determined immediately prior to insecticide application. The center two rows of each plot were harvested on October 6. Applications were made using a CO2 sprayer equipped with TeeJet 11002 flat-fan air induction nozzles at 40 psi and using a carrier volume of 20 GPA. Insecticide applications were made on August 20 when soybean plots were at the R5 growth stage. Insecticide products, active ingredients, and application rates are listed in Table 1.
In 2020, low and high labeled rates of pyrethroid and premix insecticides were tested for control of adult grasshoppers in late growth stage soybeans at the NDSU Agronomy Farm, Casselton, ND. Continue to frequently scout for grasshopper infestations.ĥ0-75 nymphs per square yard in field margins orģ0-45 nymphs per square yard inside field.Ģ1-40 adults per square yard in field margin orĨ-15 adults per square yard inside field. Adults are more mobile (wings to fly) and fly to find greener fields for feeding, and have a larger appetite. Due to the heat pushing degree days, an increasing number of adult grasshoppers are present, which represents a greater risk to field crops. Some species of grasshoppers emerge earlier than other species, so different life stages are common in early summer. This page was adapted from the article, "Which Insecticide is Best for Grasshopper Control?," which appeared in Crop & Pest Report on July 15, 2021.Īll stages of grasshoppers (1st instars to adults) can be observed in the field crops now.
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