Scouting for Sugarcane Aphids in Sorghum9;

The sugarcane aphid (SCA) is pale yellow, gray, or tan. SCA has black cornicles toward the rear as well as black feet and antennae (Figure 1). SCA feeds on the lower sides of sorghum leaves, producing a sticky honeydew substance. Symptoms of feeding include yellow, purple, then brown leaf tissue. Infestations can limit plant height and yield potential. Harvest can be difficult due to the honeydew clogging combines and preventing grain from being released. Scout for SCA once a week by walking 25 feet into the field and checking for the presence of honeydew and SCA along 50 feet of row. Check at least four locations per field. If SCA is found on low to mid-canopy leaves, fields should be scouted twice a week. Use thresholds to determine if an insecticide application is required to help protect yield potential.

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Figure 1. Sugarcane aphids with black feet and cornicles.
Source: Patrick Porter, Texas Cooperative Extension, Bugwood.org.