Not all registered pesticides are listed. Pesticide precautions Protect water Calculate VOCs Protect bees Irrigate following application to move the material into the zone of larval feeding. Apply liquid sprays or nematode applications to moist turfgrass and granules to dry turfgrass. Threshold levels are much lower for bentgrass grown in the desert region than the rest of the state because of the heat and drought stress. If there are more than four grubs per cup cutter sample (or 40 grubs per square foot), treatment is necessary. Grubs will be present at the thatch/soil interface. Use a cup cutter to sample for grubs underneath areas of turfgrass damage and in areas where grubs have been active in the past or are likely to occur (collars, wet spots, black layer spots). You can also sample about 2 weeks after adults are caught in black light traps. If irregular dead spots appear in turfgrass, sample for black turfgrass ataenius grubs or other insects. These materials can also be effective against very young grubs. However, damaging infestations are not common and treatment is not regularly required, so this preventive approach is not recommended where an infestation is not expected. The most effective insecticides, the neonicotinoids such as imidacloprid, provide best control if applied to just before adults lay eggs, generally before serious damage is seen. They probably overwinter in a reproductive dormancy. Adults are continuously active during warm months in inland areas. At least two or three generations develop in California each year with up to five in the warmest part of the state. Eggs hatch into scarab grubs, which can be distinguished from other white grubs by their small size, the scattered pattern of bristles on the last abdominal segment, and a pair of pads at the tip of the abdomen. Adult black turfgrass ataenius can easily be mistaken for another beetle, Aphodius lividus (not known to damage turf), which is slightly smaller and chocolate brown with straw-colored stripes near the center of the back and along the margin of the elytra.įemale ataenius adults burrow into the thatch and upper soil where they lay clutches of 11 or 12 eggs. Adults can be seen any time of day, especially on golf course greens and tees. The adult black turfgrass ataenius beetle is 0.2 inch (5 mm) long, shining jet black, and has parallel grooves on the wing covers (elytra).
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