University of Maryland Extension

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Sod Webworm - Lawns

Back to Common Problems - Lawns Sod webworms are a complex of over 20 species of Pyralid moths across the U.S. Two species that have occurred in outbreak situations are the bluegrass webworm and the larger sod webworm. The caterpillars are the damaging stage of these moths. Caterpillars range in...

Scoliid Wasps - Lawns

Back to Common Problems - Lawns These are actually good guys! Another group of ground nesting wasps are the digger or Scoliid wasps. Scoliid wasps are about 5/8 inch long, blue-black, with blackish purple wings. There are two yellow stripes, one on each side of the abdomen. Their bodies are fairly...

Mining Bees - Lawns

Back to Common Problems - Lawns (More insects from HGIC) Publication: (PDF) HG 104 Mining Bees and Ground Nesting Wasps Mining, or digger bees nest in burrows in the ground. Unlike honey bees, mining bees are solitary bees. Each mining bee female usually digs her own burrow to rear her young. Large...

Grubs - Lawns

Back to Common Problems - Lawns Grubs are the larvae of Japanese Beetles (grub, adult), May or June Beetles (adults), Masked Chafer Beetles (grub, adult) or Oriental beetles (adult). Grubs feed on the roots of plants, particularly grass and remain underground for one to three years until they...

Green June Beetle - Lawns

Back to Common Problems - Lawns The green June beetle is one of the white grubs that may be found in lawns. This grub is unlike other grubs in that it will crawl on the surface of the grass at night. Other white grubs remain in the soil and feed on the turfgrass roots. The adult beetle is ¾ - 1...

Chinch Bug - Lawn

Back to Common Problems - Lawns Chinch Bugs Chinch bugs are small insects (about 1/8 inch when mature) with piercing-sucking mouthparts that feed on the sap of grass plants. They are found in the thatch area of turfgrass and feed on the lower leaf sheath and crown area of the plants. There are 3...

Cicada Killer Wasps - Lawns

Back to Common Problems - Lawns Publication: (PDF) HG 104 - Mining Bees and Ground- Nesting Wasps Cicada killers resemble large yellowjackets. They are mostly black with pale yellow markings on the abdomen and are about 2 inches long. Despite their appearance, these insects are inoffensive and...

Summer Patch - Lawns

Back to Common Problems - Lawns Summer patch causes circular straw-colored patches of grass during the summer. Grasses Affected: · The most commonly infected grasses are Kentucky bluegrass and fine leaf fescue. Primary symptoms: · Initial symptoms on Kentucky bluegrass are roughly circular straw-...

Striped Smut - Lawns

Smut fungi are a very diverse group of fungi that usually attack leaves, leaf sheaths, stems and inflorescences. The most common smuts on turfgrasses are stripe, flag and blister smuts. Of these the most common and damaging is stripe smut. Grasses Affected: · Striped smut is primarily a problem on...

Slime Mold - Lawns

Back to Common Problems - Lawns Slime molds don't cause diseases on turfgrasses but occasionally cause excitement when they suddenly appear as white, gray, or purplish spore masses on the blades. They are not parasitic on grass but feed on other microorganisms, such as other fungi and bacteria, in...

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