Oats are more tolerant of aphid damage than barley and wheat. The economic threshold is the density of insects or the level of insect damage at which the cost of control becomes justifiable. The threshold for Russian wheat aphid is measured in terms of the percentage of plants showing damage. Economic thresholds for the application of insecticides have been adopted from aphid control recommendations in the United States. The goal of insecticide treatment is to protect the flag leaf because of its major contribution to yield.
Most damage is done in the time between the appearance of the flag leaf and the head.
Apply only once per season. Follow label for safety precautions. Not registered on rye. For 1989, these products can be used to control Russian wheat aphid. Check with your local dealer to determine availability, dosage, precautions, wait periods and other information on application.