The biology of the grass webworm, Herpetogramma licarsisalis (Walker), currently the most serious turf pest in Hawaii, was studied by laboratory rearing at an average temperature of 24.5°C and in an outdoor cage. Eggs are flat, elliptical, 0.64 × 0.91 mm and were deposited singly or in masses on the upper surface of leaf blades along the midrib and on plastic vials. Larvae have 5 instars; the 1st instar head capsule is black, all others are brown. Mature larvae are brown to green and may have a rose tint over part or most of the body. When full grown they averaged 20 mm in length with a head capsule width of 1.8 mm. Pupation occurs in a loosely-woven hibernaculum. Adults are uniformly fawn to light brown and have a wing span of 23.9 mm. The sexes are readily distinguished by pupal terminalia and adult abdominal characters. Most females had a preoviposition period of 3–6 days. Mean egg production was 249 with a maximum of 557. Duration of each stage averaged 4–6 days for the egg, 14.3 days for the larva, 7.3 days for the pupa, 13.1 days for male moths and 13.5 days for female moths. The grass webworm is strictly nocturnal—adult eclosion, mating, oviposition, hatching, feeding, molting and pupation occurring at night.
Document Type: Research Article
Publication date: September 1, 1976
More about this publication?
Annals of the Entomological Society of America is published in January, March, May, July, September, and November. Annals especially invites submission of manuscripts that integrate different areas of insect biology, and address issues that are likely to be of broad relevance to entomologists. Articles also report on basic aspects of the biology of arthropods, divided into categories by subject matter: systematics; ecology and population biology; arthropod biology; arthropods in relation to plant diseases; conservation biology and biodiversity; physiology, biochemistry, and toxicology; morphology, histology, and fine structure; genetics; and behavior.