Summer days, St. Augustine lawns, and chinch bugs (7-12-10)

These hot summer days are ideal for your St. Augustinegrass lawn to heal and get healthy from winter injury or spring diseases, but don’t let your guard down just yet as chinch bugs love St. Augustinegrass lawns. The adults of this destructive insect are only about 1/5 of an inch long. They are black with what appears to be a white X across their backs where their wings fold over. The immature nymphs may be pink to brown with a single white line across their backs.

Turf injury symptoms are a subtle yellowing of the leaf blades, thinning of the canopy and eventual death of the turf under extreme insect pressure. These insects are somewhat unique in that they prefer hot sunny areas of the lawn over shade so their injury symptoms generally appear in the open front lawn area first.

To scout for these tiny insects in your lawn you will need to part the turf canopy to the soil surface along a line where there is a change from damaged yellowing turf to healthy green turf. They move rather quickly, so keep an alert eye for their scurrying back into the turf. Another way to scout for chinch bugs is by cutting both ends from a large coffee can, twisting it into the turf a couple of inches until it will hold water, then filling it with soapy water. In a few minutes the chinch bugs, if present, will begin swimming on the surface. Carbaryl, cyfluthrin, lambda-cyhalothrin and permethrin are labeled insecticides for their control.

While chinch bugs prefer St. Augustinegrass lawns, other turf species may also be en